Update go.mod and go.sum (#13)

Add Rule as a first-class canonical kind (rules/<name>.md, loaded like
agents) and propagate it the way each harness actually loads it:

- claude-code: native ~/.claude/rules directory symlink (preserves rule
  path-scoping frontmatter); rules NOT folded into CLAUDE.md.
- opencode/kilo/zed/crush: fold rule bodies into the global AGENTS.md
  always-on instructions file (frontmatter stripped). crush has no global
  instructions file, so register the absolute AGENTS.md path in
  options.context_paths (defaults are re-prepended at load, so nothing is
  clobbered).
- goose: fold into ~/.config/goose/.goosehints.
- cagent: fold into the per-agent instruction.

Also:
- Wire markdown agents to opencode (~/.config/opencode/agents) and fix the
  kilo agents symlink: plural ~/.config/kilo/agents (singular "agent" is a
  silent no-op on current Kilo CLI).
- Add ManagesAgents/ManagesRules to HarnessCapabilities + ImportResult.Rules;
  claude-code/opencode import rules/agents round-trip.
- Centralize instruction selection in Bundle.InstructionText /
  InstructionTextWithRules (replaces per-adapter override duplication).
- init scaffolds + imports rules; README capability matrix gains
  Agents/Rules columns with native-vs-folded footnotes.

Grounded each harness's sink against official docs + config source this
session. Gate: gofmt, go vet, go test -race ./..., golangci-lint (0),
govulncheck (clean).

README.md

@@ -3,7 +3,7 @@
 </p>
 
 <p align="center">
-  <strong>One canonical source of truth</strong> for skills, agents, MCP servers, LLM endpoints, and global instructions across every LLM harness on your machine.
+  <strong>One canonical source of truth</strong> for skills, agents, rules, MCP servers, LLM endpoints, and global instructions across every LLM harness on your machine.
 </p>
 
 <p align="center">
@@ -40,6 +40,7 @@ Edit once. Forget the others. They drift. Things stop working in odd places.
                  │  • profiles/<name>.yaml          │
                  │  • skills/<name>/SKILL.md        │
                  │  • agents/<name>.md              │
+                 │  • rules/<name>.md               │
                  │  • mcp.yaml                      │
                  │  • instructions/global.md        │
                  └──────────────┬───────────────────┘
@@ -145,21 +146,30 @@ harness-sync goes out of its way to avoid.
 
 ### Capability matrix
 
-What harness-sync writes per harness. Harnesses with a **built-in subscription** receive MCP + skills + instructions only — provider/model/endpoint config is skipped to avoid conflicting with the harness's own auth.
+What harness-sync writes per harness. Harnesses with a **built-in subscription** receive MCP + skills + agents + rules + instructions only — provider/model/endpoint config is skipped to avoid conflicting with the harness's own auth.
 
 Skills paths are grounded in each harness's official documentation (kilo.ai, opencode.ai, goose-docs.ai). kilo, opencode, and goose also scan `~/.claude/skills/` as a compatibility path, so the claude-code symlink passively reaches them already.
 
-| Harness | Built-in sub | Providers | Models | MCP | Skills | Instructions |
+| Harness | Built-in sub | Providers | Models | MCP | Skills | Agents | Rules | Instructions |
-|---|:---:|:---:|:---:|:---:|:---:|:---:|
+|---|:---:|:---:|:---:|:---:|:---:|:---:|:---:|:---:|
-| **claude-code** | ✓ | — | — | ✓ | ✓ | ✓ |
+| **claude-code** | ✓ | — | — | ✓ | ✓ | ✓ | ✓ⁿ | ✓ |
-| **crush** | — | ✓ | ✓ | ✓ | ✓ | — |
+| **crush** | — | ✓ | ✓ | ✓ | ✓ | — | ✓ᶠ | ✓ᶠ |
-| **kilo** | — | ✓ | ✓ | ✓ | ✓ | — |
+| **kilo** | — | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ᶠ | ✓ᶠ |
-| **opencode** | — | ✓ | ✓ | ✓ | ✓ | ✓ |
+| **opencode** | — | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ᶠ | ✓ |
-| **goose** | — | ✓ | ✓ | ✓ | ✓ | — |
+| **goose** | — | ✓ | ✓ | ✓ | ✓ | — | ✓ᶠ | ✓ᶠ |
-| **cagent** | — | ✓ | ✓ | ✓ | — | ✓ |
+| **cagent** | — | ✓ | ✓ | ✓ | — | — | ✓ᶠ | ✓ |
-| **zed** | — | ✓ | ✓ | ✓ | — | — |
+| **zed** | — | ✓ | ✓ | — | — | — | ✓ᶠ | ✓ᶠ |
 
-The matrix is machine-readable via `adapter.Capabilities()` — every adapter implements `HarnessCapabilities` so tooling can inspect what will change before running `apply`.
+The matrix is machine-readable via `adapter.Capabilities()` — every adapter implements `HarnessCapabilities` (`ManagesProviders/Models/MCP/Skills/Agents/Rules/Instructions`) so tooling can inspect what will change before running `apply`.
+
+### Agents & rules — native where possible, folded where necessary
+
+Each kind is delivered the way the target harness actually loads it (grounded in each harness's docs and config source — a wrong path is a silent no-op):
+
+- **Agents** are markdown subagents. They map cleanly to **claude-code** (`~/.claude/agents/`), **kilo** (`~/.config/kilo/agents/` — plural; the older singular `agent/` is a no-op on current Kilo CLI), and **opencode** (`~/.config/opencode/agents/`), all as directory symlinks. **goose** (YAML recipes) and **cagent** (inline YAML `agents:`) use incompatible agent formats, and **crush**/**zed** have no markdown-subagent concept — so agents are not propagated there.
+- **Rules** (`rules/<name>.md`) are topic-scoped instruction fragments. **claude-code** auto-loads a rules *directory* natively (ⁿ), so they're delivered as a `~/.claude/rules` symlink — preserving each rule's optional path-scoping frontmatter. No other harness has a rules directory, so their bodies are **folded** (ᶠ) into that harness's global always-on instructions file — `AGENTS.md` (opencode/kilo/zed/crush), `.goosehints` (goose), or the per-agent `instruction:` (cagent). crush has no global instructions file, so harness-sync writes `~/.config/crush/AGENTS.md` and registers its absolute path in `options.context_paths` (crush always re-adds its built-in defaults at load, so nothing is clobbered).
+
+ⁿ delivered as a native rules directory  ᶠ folded into the harness's global instructions file
 
 > **Merged, not replaced.** For harnesses with user-managed config keys (every one
 > except cagent), harness-sync reads the existing file, overlays only the keys
@@ -279,7 +289,7 @@ end-to-end test that runs the real binary against a fake `$HOME`.
 
 ```
 cmd/harness-sync/main.go              # cobra entrypoint + adapter registration
-internal/canonical/                   # Bundle, Profile, MCPRegistry, Skill, Agent types + loader
+internal/canonical/                   # Bundle, Profile, MCPRegistry, Skill, Agent, Rule types + loader
 internal/adapter/                     # Adapter interface, Registry, FileSet
 internal/adapter/common/              # shared building blocks (BuildProviders, BuildMCPMapStyled, MergeJSONKeys, MergeYAMLKeys, …)
 internal/adapters/<harness>/          # one package per harness, ~50-100 LOC of harness-specific glue

go.mod

@@ -4,8 +4,8 @@ go 1.25.0
 
 require (
 	github.com/charmbracelet/huh v1.0.0
-	github.com/lukaszraczylo/oss-telemetry v0.2.1
+	github.com/lukaszraczylo/oss-telemetry v0.2.3
-	github.com/pelletier/go-toml/v2 v2.3.1
+	github.com/pelletier/go-toml/v2 v2.4.2
 	github.com/spf13/afero v1.15.0
 	github.com/spf13/cobra v1.10.2
 	github.com/stretchr/testify v1.9.0
@@ -33,7 +33,7 @@ require (
 	github.com/lucasb-eyer/go-colorful v1.4.0 // indirect
 	github.com/mattn/go-isatty v0.0.22 // indirect
 	github.com/mattn/go-localereader v0.0.1 // indirect
-	github.com/mattn/go-runewidth v0.0.23 // indirect
+	github.com/mattn/go-runewidth v0.0.24 // indirect
 	github.com/mitchellh/hashstructure/v2 v2.0.2 // indirect
 	github.com/muesli/ansi v0.0.0-20230316100256-276c6243b2f6 // indirect
 	github.com/muesli/cancelreader v0.2.2 // indirect
@@ -42,7 +42,6 @@ require (
 	github.com/rivo/uniseg v0.4.7 // indirect
 	github.com/spf13/pflag v1.0.10 // indirect
 	github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e // indirect
-	golang.org/x/sync v0.20.0 // indirect
+	golang.org/x/sys v0.46.0 // indirect
-	golang.org/x/sys v0.45.0 // indirect
+	golang.org/x/text v0.38.0 // indirect
-	golang.org/x/text v0.37.0 // indirect
 )

go.sum

@@ -8,28 +8,18 @@ github.com/aymanbagabas/go-udiff v0.3.1 h1:LV+qyBQ2pqe0u42ZsUEtPiCaUoqgA9gYRDs3v
 github.com/aymanbagabas/go-udiff v0.3.1/go.mod h1:G0fsKmG+P6ylD0r6N/KgQD/nWzgfnl8ZBcNLgcbrw8E=
 github.com/catppuccin/go v0.3.0 h1:d+0/YicIq+hSTo5oPuRi5kOpqkVA5tAsU6dNhvRu+aY=
 github.com/catppuccin/go v0.3.0/go.mod h1:8IHJuMGaUUjQM82qBrGNBv7LFq6JI3NnQCF6MOlZjpc=
-github.com/charmbracelet/bubbles v0.21.1-0.20250623103423-23b8fd6302d7 h1:JFgG/xnwFfbezlUnFMJy0nusZvytYysV4SCS2cYbvws=
-github.com/charmbracelet/bubbles v0.21.1-0.20250623103423-23b8fd6302d7/go.mod h1:ISC1gtLcVilLOf23wvTfoQuYbW2q0JevFxPfUzZ9Ybw=
 github.com/charmbracelet/bubbles v1.0.0 h1:12J8/ak/uCZEMQ6KU7pcfwceyjLlWsDLAxB5fXonfvc=
 github.com/charmbracelet/bubbles v1.0.0/go.mod h1:9d/Zd5GdnauMI5ivUIVisuEm3ave1XwXtD1ckyV6r3E=
-github.com/charmbracelet/bubbletea v1.3.6 h1:VkHIxPJQeDt0aFJIsVxw8BQdh/F/L2KKZGsK6et5taU=
-github.com/charmbracelet/bubbletea v1.3.6/go.mod h1:oQD9VCRQFF8KplacJLo28/jofOI2ToOfGYeFgBBxHOc=
 github.com/charmbracelet/bubbletea v1.3.10 h1:otUDHWMMzQSB0Pkc87rm691KZ3SWa4KUlvF9nRvCICw=
 github.com/charmbracelet/bubbletea v1.3.10/go.mod h1:ORQfo0fk8U+po9VaNvnV95UPWA1BitP1E0N6xJPlHr4=
-github.com/charmbracelet/colorprofile v0.2.3-0.20250311203215-f60798e515dc h1:4pZI35227imm7yK2bGPcfpFEmuY1gc2YSTShr4iJBfs=
-github.com/charmbracelet/colorprofile v0.2.3-0.20250311203215-f60798e515dc/go.mod h1:X4/0JoqgTIPSFcRA/P6INZzIuyqdFY5rm8tb41s9okk=
 github.com/charmbracelet/colorprofile v0.4.3 h1:QPa1IWkYI+AOB+fE+mg/5/4HRMZcaXex9t5KX76i20Q=
 github.com/charmbracelet/colorprofile v0.4.3/go.mod h1:/zT4BhpD5aGFpqQQqw7a+VtHCzu+zrQtt1zhMt9mR4Q=
 github.com/charmbracelet/huh v1.0.0 h1:wOnedH8G4qzJbmhftTqrpppyqHakl/zbbNdXIWJyIxw=
 github.com/charmbracelet/huh v1.0.0/go.mod h1:5YVc+SlZ1IhQALxRPpkGwwEKftN/+OlJlnJYlDRFqN4=
 github.com/charmbracelet/lipgloss v1.1.0 h1:vYXsiLHVkK7fp74RkV7b2kq9+zDLoEU4MZoFqR/noCY=
 github.com/charmbracelet/lipgloss v1.1.0/go.mod h1:/6Q8FR2o+kj8rz4Dq0zQc3vYf7X+B0binUUBwA0aL30=
-github.com/charmbracelet/x/ansi v0.9.3 h1:BXt5DHS/MKF+LjuK4huWrC6NCvHtexww7dMayh6GXd0=
-github.com/charmbracelet/x/ansi v0.9.3/go.mod h1:3RQDQ6lDnROptfpWuUVIUG64bD2g2BgntdxH0Ya5TeE=
 github.com/charmbracelet/x/ansi v0.11.7 h1:kzv1kJvjg2S3r9KHo8hDdHFQLEqn4RBCb39dAYC84jI=
 github.com/charmbracelet/x/ansi v0.11.7/go.mod h1:9qGpnAVYz+8ACONkZBUWPtL7lulP9No6p1epAihUZwQ=
-github.com/charmbracelet/x/cellbuf v0.0.13 h1:/KBBKHuVRbq1lYx5BzEHBAFBP8VcQzJejZ/IA3iR28k=
-github.com/charmbracelet/x/cellbuf v0.0.13/go.mod h1:xe0nKWGd3eJgtqZRaN9RjMtK7xUYchjzPr7q6kcvCCs=
 github.com/charmbracelet/x/cellbuf v0.0.15 h1:ur3pZy0o6z/R7EylET877CBxaiE1Sp1GMxoFPAIztPI=
 github.com/charmbracelet/x/cellbuf v0.0.15/go.mod h1:J1YVbR7MUuEGIFPCaaZ96KDl5NoS0DAWkskup+mOY+Q=
 github.com/charmbracelet/x/conpty v0.1.0 h1:4zc8KaIcbiL4mghEON8D72agYtSeIgq8FSThSPQIb+U=
@@ -38,12 +28,8 @@ github.com/charmbracelet/x/errors v0.0.0-20240508181413-e8d8b6e2de86 h1:JSt3B+U9
 github.com/charmbracelet/x/errors v0.0.0-20240508181413-e8d8b6e2de86/go.mod h1:2P0UgXMEa6TsToMSuFqKFQR+fZTO9CNGUNokkPatT/0=
 github.com/charmbracelet/x/exp/golden v0.0.0-20241011142426-46044092ad91 h1:payRxjMjKgx2PaCWLZ4p3ro9y97+TVLZNaRZgJwSVDQ=
 github.com/charmbracelet/x/exp/golden v0.0.0-20241011142426-46044092ad91/go.mod h1:wDlXFlCrmJ8J+swcL/MnGUuYnqgQdW9rhSD61oNMb6U=
-github.com/charmbracelet/x/exp/strings v0.0.0-20240722160745-212f7b056ed0 h1:qko3AQ4gK1MTS/de7F5hPGx6/k1u0w4TeYmBFwzYVP4=
-github.com/charmbracelet/x/exp/strings v0.0.0-20240722160745-212f7b056ed0/go.mod h1:pBhA0ybfXv6hDjQUZ7hk1lVxBiUbupdw5R31yPUViVQ=
 github.com/charmbracelet/x/exp/strings v0.1.0 h1:i69S2XI7uG1u4NLGeJPSYU++Nmjvpo9nwd6aoEm7gkA=
 github.com/charmbracelet/x/exp/strings v0.1.0/go.mod h1:/ehtMPNh9K4odGFkqYJKpIYyePhdp1hLBRvyY4bWkH8=
-github.com/charmbracelet/x/term v0.2.1 h1:AQeHeLZ1OqSXhrAWpYUtZyX1T3zVxfpZuEQMIQaGIAQ=
-github.com/charmbracelet/x/term v0.2.1/go.mod h1:oQ4enTYFV7QN4m0i9mzHrViD7TQKvNEEkHUMCmsxdUg=
 github.com/charmbracelet/x/term v0.2.2 h1:xVRT/S2ZcKdhhOuSP4t5cLi5o+JxklsoEObBSgfgZRk=
 github.com/charmbracelet/x/term v0.2.2/go.mod h1:kF8CY5RddLWrsgVwpw4kAa6TESp6EB5y3uxGLeCqzAI=
 github.com/charmbracelet/x/termios v0.1.1 h1:o3Q2bT8eqzGnGPOYheoYS8eEleT5ZVNYNy8JawjaNZY=
@@ -54,7 +40,6 @@ github.com/clipperhouse/displaywidth v0.11.0 h1:lBc6kY44VFw+TDx4I8opi/EtL9m20WSE
 github.com/clipperhouse/displaywidth v0.11.0/go.mod h1:bkrFNkf81G8HyVqmKGxsPufD3JhNl3dSqnGhOoSD/o0=
 github.com/clipperhouse/uax29/v2 v2.7.0 h1:+gs4oBZ2gPfVrKPthwbMzWZDaAFPGYK72F0NJv2v7Vk=
 github.com/clipperhouse/uax29/v2 v2.7.0/go.mod h1:EFJ2TJMRUaplDxHKj1qAEhCtQPW2tJSwu5BF98AuoVM=
-github.com/cpuguy83/go-md2man/v2 v2.0.4/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
 github.com/cpuguy83/go-md2man/v2 v2.0.6/go.mod h1:oOW0eioCTA6cOiMLiUPZOpcVxMig6NIQQ7OS05n1F4g=
 github.com/creack/pty v1.1.24 h1:bJrF4RRfyJnbTJqzRLHzcGaZK1NeM5kTC9jGgovnR1s=
 github.com/creack/pty v1.1.24/go.mod h1:08sCNb52WyoAwi2QDyzUCTgcvVFhUzewun7wtTfvcwE=
@@ -66,22 +51,16 @@ github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f h1:Y/CXytFA4m6
 github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f/go.mod h1:vw97MGsxSvLiUE2X8qFplwetxpGLQrlU1Q9AUEIzCaM=
 github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
 github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
-github.com/lucasb-eyer/go-colorful v1.2.0 h1:1nnpGOrhyZZuNyfu1QjKiUICQ74+3FNCN69Aj6K7nkY=
-github.com/lucasb-eyer/go-colorful v1.2.0/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
 github.com/lucasb-eyer/go-colorful v1.4.0 h1:UtrWVfLdarDgc44HcS7pYloGHJUjHV/4FwW4TvVgFr4=
 github.com/lucasb-eyer/go-colorful v1.4.0/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
-github.com/lukaszraczylo/oss-telemetry v0.2.1 h1:6ULyfzXplpdmIY/i01OPM1jeod9+L1RAhI0jtbVnJI0=
+github.com/lukaszraczylo/oss-telemetry v0.2.3 h1:xoDtBqeZGmXj7IteiE1M5WMuzeoqag58qEleI0Cf2Ms=
-github.com/lukaszraczylo/oss-telemetry v0.2.1/go.mod h1:+Cn78qZo8rc3T9eZt0v3oICYRdd75wORtSidc8lNjDQ=
+github.com/lukaszraczylo/oss-telemetry v0.2.3/go.mod h1:+Cn78qZo8rc3T9eZt0v3oICYRdd75wORtSidc8lNjDQ=
-github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
-github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
 github.com/mattn/go-isatty v0.0.22 h1:j8l17JJ9i6VGPUFUYoTUKPSgKe/83EYU2zBC7YNKMw4=
 github.com/mattn/go-isatty v0.0.22/go.mod h1:ZXfXG4SQHsB/w3ZeOYbR0PrPwLy+n6xiMrJlRFqopa4=
 github.com/mattn/go-localereader v0.0.1 h1:ygSAOl7ZXTx4RdPYinUpg6W99U8jWvWi9Ye2JC/oIi4=
 github.com/mattn/go-localereader v0.0.1/go.mod h1:8fBrzywKY7BI3czFoHkuzRoWE9C+EiG4R1k4Cjx5p88=
-github.com/mattn/go-runewidth v0.0.16 h1:E5ScNMtiwvlvB5paMFdw9p4kSQzbXFikJ5SQO6TULQc=
+github.com/mattn/go-runewidth v0.0.24 h1:cpokDiIn0MGnhdHwuWnJBITySJ20QyNGnY2kR/ay2DU=
-github.com/mattn/go-runewidth v0.0.16/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
+github.com/mattn/go-runewidth v0.0.24/go.mod h1:XBkDxAl56ILZc9knddidhrOlY5R/pDhgLpndooCuJAs=
-github.com/mattn/go-runewidth v0.0.23 h1:7ykA0T0jkPpzSvMS5i9uoNn2Xy3R383f9HDx3RybWcw=
-github.com/mattn/go-runewidth v0.0.23/go.mod h1:XBkDxAl56ILZc9knddidhrOlY5R/pDhgLpndooCuJAs=
 github.com/mitchellh/hashstructure/v2 v2.0.2 h1:vGKWl0YJqUNxE8d+h8f6NJLcCJrgbhC4NcD46KavDd4=
 github.com/mitchellh/hashstructure/v2 v2.0.2/go.mod h1:MG3aRVU/N29oo/V/IhBX8GR/zz4kQkprJgF2EVszyDE=
 github.com/muesli/ansi v0.0.0-20230316100256-276c6243b2f6 h1:ZK8zHtRHOkbHy6Mmr5D264iyp3TiX5OmNcI5cIARiQI=
@@ -90,24 +69,17 @@ github.com/muesli/cancelreader v0.2.2 h1:3I4Kt4BQjOR54NavqnDogx/MIoWBFa0StPA8ELU
 github.com/muesli/cancelreader v0.2.2/go.mod h1:3XuTXfFS2VjM+HTLZY9Ak0l6eUKfijIfMUZ4EgX0QYo=
 github.com/muesli/termenv v0.16.0 h1:S5AlUN9dENB57rsbnkPyfdGuWIlkmzJjbFf0Tf5FWUc=
 github.com/muesli/termenv v0.16.0/go.mod h1:ZRfOIKPFDYQoDFF4Olj7/QJbW60Ol/kL1pU3VfY/Cnk=
-github.com/pelletier/go-toml/v2 v2.2.3 h1:YmeHyLY8mFWbdkNWwpr+qIL2bEqT0o95WSdkNHvL12M=
+github.com/pelletier/go-toml/v2 v2.4.2 h1:M2fKKbmyvI+hGId/D0W64qDBMVhJnNR10O5gIbMc//Q=
-github.com/pelletier/go-toml/v2 v2.2.3/go.mod h1:MfCQTFTvCcUyyvvwm1+G6H/jORL20Xlb6rzQu9GuUkc=
+github.com/pelletier/go-toml/v2 v2.4.2/go.mod h1:2gIqNv+qfxSVS7cM2xJQKtLSTLUE9V8t9Stt+h56mCY=
-github.com/pelletier/go-toml/v2 v2.3.1 h1:MYEvvGnQjeNkRF1qUuGolNtNExTDwct51yp7olPtrEc=
-github.com/pelletier/go-toml/v2 v2.3.1/go.mod h1:2gIqNv+qfxSVS7cM2xJQKtLSTLUE9V8t9Stt+h56mCY=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
 github.com/rivo/uniseg v0.4.7 h1:WUdvkW8uEhrYfLC4ZzdpI2ztxP1I582+49Oc5Mq64VQ=
 github.com/rivo/uniseg v0.4.7/go.mod h1:FN3SvrM+Zdj16jyLfmOkMNblXMcoc8DfTHruCPUcx88=
 github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
 github.com/spf13/afero v1.15.0 h1:b/YBCLWAJdFWJTN9cLhiXXcD7mzKn9Dm86dNnfyQw1I=
 github.com/spf13/afero v1.15.0/go.mod h1:NC2ByUVxtQs4b3sIUphxK0NioZnmxgyCrfzeuq8lxMg=
-github.com/spf13/cobra v1.8.1 h1:e5/vxKd/rZsfSJMUX1agtjeTDf+qv1/JdBF8gg5k9ZM=
-github.com/spf13/cobra v1.8.1/go.mod h1:wHxEcudfqmLYa8iTfL+OuZPbBZkmvliBWKIezN3kD9Y=
 github.com/spf13/cobra v1.10.2 h1:DMTTonx5m65Ic0GOoRY2c16WCbHxOOw6xxezuLaBpcU=
 github.com/spf13/cobra v1.10.2/go.mod h1:7C1pvHqHw5A4vrJfjNwvOdzYu0Gml16OCs2GRiTUUS4=
-github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
-github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/spf13/pflag v1.0.9/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/spf13/pflag v1.0.10 h1:4EBh2KAYBwaONj6b2Ye1GiHfwjqyROoF4RwYO+vPwFk=
 github.com/spf13/pflag v1.0.10/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
@@ -118,20 +90,11 @@ github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e/go.mod h1:RbqR21r5mrJu
 go.yaml.in/yaml/v3 v3.0.4/go.mod h1:DhzuOOF2ATzADvBadXxruRBLzYTpT36CKvDb3+aBEFg=
 golang.org/x/exp v0.0.0-20231006140011-7918f672742d h1:jtJma62tbqLibJ5sFQz8bKtEM8rJBtfilJ2qTU199MI=
 golang.org/x/exp v0.0.0-20231006140011-7918f672742d/go.mod h1:ldy0pHrwJyGW56pPQzzkH36rKxoZW1tw7ZJpeKx+hdo=
-golang.org/x/sync v0.16.0 h1:ycBJEhp9p4vXvUZNszeOq0kGTPghopOL8q0fq3vstxw=
-golang.org/x/sync v0.16.0/go.mod h1:1dzgHSNfp02xaA81J2MS99Qcpr2w7fw1gpm99rleRqA=
-golang.org/x/sync v0.20.0 h1:e0PTpb7pjO8GAtTs2dQ6jYa5BWYlMuX047Dco/pItO4=
-golang.org/x/sync v0.20.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
 golang.org/x/sys v0.0.0-20210809222454-d867a43fc93e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.46.0 h1:noSf2Fq6F8DBgS+LysIkx7rIExoNHJsxOAtPp4rthXw=
-golang.org/x/sys v0.33.0 h1:q3i8TbbEz+JRD9ywIRlyRAQbM0qF7hu24q3teo2hbuw=
+golang.org/x/sys v0.46.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
-golang.org/x/sys v0.33.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
+golang.org/x/text v0.38.0 h1:sXmwo9DwP3OK9EZ7PqAdaooSGozfl/3a6/xJcbzPRhE=
-golang.org/x/sys v0.45.0 h1:dO4czNzziLiiXplLQgBCEpCvXQ3dnkn0SdaZSYdQ+FY=
+golang.org/x/text v0.38.0/go.mod h1:YXZt3QhHUKYT53r2lLKFIVi6Ao1jdzrTR/KQ09qyxF4=
-golang.org/x/sys v0.45.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
-golang.org/x/text v0.28.0 h1:rhazDwis8INMIwQ4tpjLDzUhx6RlXqZNPEM0huQojng=
-golang.org/x/text v0.28.0/go.mod h1:U8nCwOR8jO/marOQ0QbDiOngZVEBB7MAiitBuMjXiNU=
-golang.org/x/text v0.37.0 h1:Cqjiwd9eSg8e0QAkyCaQTNHFIIzWtidPahFWR83rTrc=
-golang.org/x/text v0.37.0/go.mod h1:a5sjxXGs9hsn/AJVwuElvCAo9v8QYLzvavO5z2PiM38=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=

internal/adapter/adapter.go

@@ -31,6 +31,8 @@ type HarnessCapabilities struct {
 	ManagesModels       bool // writes model selection config
 	ManagesMCP          bool // writes MCP server config
 	ManagesSkills       bool // writes skills symlink or equivalent
+	ManagesAgents       bool // writes agents symlink or equivalent
+	ManagesRules        bool // delivers rules (native rules dir, or folded into instructions)
 	ManagesInstructions bool // writes instructions file (CLAUDE.md, AGENTS.md, etc.)
 	HasBuiltInSub       bool // has its own subscription; provider/model config is skipped
 }
@@ -47,6 +49,7 @@ type ImportResult struct {
 	Instructions string
 	Skills       []canonical.Skill
 	Agents       []canonical.Agent
+	Rules        []canonical.Rule
 	MCP          []canonical.MCPServer
 	Profiles     []canonical.Profile
 }

internal/adapter/base.go

@@ -0,0 +1,29 @@
+package adapter
+
+import "github.com/lukaszraczylo/harness-sync/internal/adapter/common"
+
+// Base holds the cross-adapter defaults (currently just the home directory
+// used to compute target paths). Embed it in each adapter struct to inherit
+// the WithHome/New constructor pattern without re-implementing it.
+type Base struct {
+	Home string
+}
+
+// BaseOption configures a Base. Returned by WithHome and consumed by NewBase.
+type BaseOption func(*Base)
+
+// WithHome overrides the home directory used for target paths. Defaults to
+// common.DefaultHome() (current $HOME) when no option is supplied.
+func WithHome(h string) BaseOption {
+	return func(b *Base) { b.Home = h }
+}
+
+// NewBase returns a Base populated from opts, with Home defaulting to the
+// current user's home directory.
+func NewBase(opts ...BaseOption) *Base {
+	b := &Base{Home: common.DefaultHome()}
+	for _, o := range opts {
+		o(b)
+	}
+	return b
+}

internal/adapter/base_test.go

@@ -0,0 +1,46 @@
+package adapter_test
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/lukaszraczylo/harness-sync/internal/adapter"
+)
+
+func TestNewBaseDefaultsHomeFromEnv(t *testing.T) {
+	b := adapter.NewBase()
+	// DefaultHome returns either $HOME or "". We only assert that the
+	// helper does not panic and that Home is a string (Go zero value is "").
+	// Environment-dependence: skip if HOME is unset (CI minimal envs).
+	if b.Home == "" {
+		t.Skip("HOME unset in test env; cannot verify default")
+	}
+	assert.NotEmpty(t, b.Home)
+}
+
+func TestNewBaseWithHomeOverrides(t *testing.T) {
+	b := adapter.NewBase(adapter.WithHome("/custom/home/path"))
+	assert.Equal(t, "/custom/home/path", b.Home)
+}
+
+func TestNewBaseOptionsApplyInOrder(t *testing.T) {
+	// Last write wins — covers the basic Apply loop in NewBase.
+	b := adapter.NewBase(
+		adapter.WithHome("/first"),
+		adapter.WithHome("/second"),
+	)
+	assert.Equal(t, "/second", b.Home)
+}
+
+func TestBaseOptionTypedCorrectly(t *testing.T) {
+	// adapter.BaseOption is the public type; WithHome must return it.
+	opt := adapter.WithHome("/x")
+	require.NotNil(t, opt)
+
+	// Apply it manually to confirm signature.
+	var b adapter.Base
+	opt(&b)
+	assert.Equal(t, "/x", b.Home)
+}

internal/adapter/common/io.go

@@ -29,6 +29,19 @@ func ReadIfExists(path string) (string, error) {
 	return ReadIfExistsFS(fsx.OS(), path)
 }
 
+// ReadExistingFile returns the file body or (nil, nil) when missing.
+// Other errors (permission denied, I/O failure) are returned verbatim so
+// read-modify-write callers can distinguish a fresh first-run state from a
+// broken read. Treating every error as "file is empty" silently overwrites
+// the user's on-disk edits during apply.
+func ReadExistingFile(path string) ([]byte, error) {
+	b, err := os.ReadFile(path) //nolint:gosec // caller-controlled path
+	if err != nil && os.IsNotExist(err) {
+		return nil, nil
+	}
+	return b, err
+}
+
 // DirExistsFS reports whether path is an existing directory on fs.
 func DirExistsFS(fs fsx.FS, path string) bool {
 	info, err := fs.Stat(path)
@@ -155,6 +168,7 @@ func parseMCPEntry(name string, raw json.RawMessage) (canonical.MCPServer, bool)
 		Cmd         json.RawMessage   `json:"cmd"`
 		Args        []string          `json:"args"`
 		URL         string            `json:"url"`
+		Headers     map[string]string `json:"headers"`
 		Env         map[string]string `json:"env"`
 		Environment map[string]string `json:"environment"`
 	}
@@ -185,6 +199,7 @@ func parseMCPEntry(name string, raw json.RawMessage) (canonical.MCPServer, bool)
 		Args:      args,
 		URL:       e.URL,
 		Transport: transport,
+		Headers:   e.Headers,
 		Env:       env,
 	}, true
 }

internal/adapter/common/io_existing_test.go

@@ -0,0 +1,64 @@
+package common_test
+
+import (
+	"errors"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/lukaszraczylo/harness-sync/internal/adapter/common"
+)
+
+// ReadExistingFile: missing file returns (nil, nil). Permission errors and
+// other I/O failures must NOT be silently swallowed — those would let
+// read-modify-write code clobber the user's on-disk state.
+
+func TestReadExistingFileMissing(t *testing.T) {
+	got, err := common.ReadExistingFile(filepath.Join(t.TempDir(), "absent"))
+	require.NoError(t, err)
+	assert.Nil(t, got)
+}
+
+func TestReadExistingFileContent(t *testing.T) {
+	dir := t.TempDir()
+	path := filepath.Join(dir, "ok.txt")
+	require.NoError(t, os.WriteFile(path, []byte("body\n"), 0o600))
+
+	got, err := common.ReadExistingFile(path)
+	require.NoError(t, err)
+	assert.Equal(t, []byte("body\n"), got)
+}
+
+func TestReadExistingFilePropagatesError(t *testing.T) {
+	// Create a directory the OS will refuse us read access to.
+	if os.Geteuid() == 0 {
+		t.Skip("running as root; cannot test permission denial")
+	}
+	dir := t.TempDir()
+	require.NoError(t, os.Mkdir(filepath.Join(dir, "locked"), 0o000))
+	t.Cleanup(func() { _ = os.Chmod(filepath.Join(dir, "locked"), 0o755) })
+
+	_, err := common.ReadExistingFile(filepath.Join(dir, "locked", "file"))
+	require.Error(t, err)
+	assert.False(t, os.IsNotExist(err), "permission denied must not be reported as not-exist")
+	assert.True(t, errors.Is(err, os.ErrPermission) || isPermission(err),
+		"expected permission error, got %v", err)
+}
+
+func isPermission(err error) bool {
+	// Some platforms wrap the error in *os.PathError. Check the string too
+	// for portability — it's a coarse signal but adequate here.
+	return err != nil && (contains(err.Error(), "permission") || contains(err.Error(), "access denied"))
+}
+
+func contains(s, sub string) bool {
+	for i := 0; i+len(sub) <= len(s); i++ {
+		if s[i:i+len(sub)] == sub {
+			return true
+		}
+	}
+	return false
+}

internal/adapter/common/io_fs_test.go

@@ -42,6 +42,7 @@ func TestImportMCPFromJSONFileFSExtractsServers(t *testing.T) {
 			"myserver": {
 				"command": "/usr/bin/mytool",
 				"args": ["--flag"],
+				"headers": {"Authorization": "Bearer ${MCP_TOKEN}"},
 				"type": "stdio"
 			}
 		}
@@ -55,6 +56,7 @@ func TestImportMCPFromJSONFileFSExtractsServers(t *testing.T) {
 	assert.Equal(t, "/usr/bin/mytool", servers[0].Command)
 	assert.Equal(t, []string{"--flag"}, servers[0].Args)
 	assert.Equal(t, "stdio", servers[0].Transport)
+	assert.Equal(t, map[string]string{"Authorization": "Bearer ${MCP_TOKEN}"}, servers[0].Headers)
 }
 
 func TestImportMCPFromJSONFileFSReadOnlyFS(t *testing.T) {

internal/adapter/common/mcp.go

@@ -39,6 +39,9 @@ func mcpEntry(s canonical.MCPServer, style MCPStyle) map[string]any {
 			}
 			e["type"] = t
 			e["url"] = s.URL
+			if len(s.Headers) > 0 {
+				e["headers"] = s.Headers
+			}
 		} else {
 			// Claude honours Transport field; Crush always uses "stdio".
 			t := "stdio"
@@ -60,6 +63,9 @@ func mcpEntry(s canonical.MCPServer, style MCPStyle) map[string]any {
 		if s.URL != "" {
 			e["type"] = "remote"
 			e["url"] = s.URL
+			if len(s.Headers) > 0 {
+				e["headers"] = s.Headers
+			}
 		} else {
 			e["type"] = "local"
 			cmd := []string{}
@@ -79,6 +85,9 @@ func mcpEntry(s canonical.MCPServer, style MCPStyle) map[string]any {
 		// fail all of them. Omitting "enabled" defaults to true.
 		if s.URL != "" {
 			e["url"] = s.URL
+			if len(s.Headers) > 0 {
+				e["headers"] = s.Headers
+			}
 		} else {
 			if s.Command != "" {
 				e["command"] = s.Command

internal/adapter/common/mcp_test.go

@@ -26,11 +26,16 @@ func TestBuildMCPMapStyledClaudeStyle(t *testing.T) {
 }
 
 func TestBuildMCPMapStyledClaudeStyleURL(t *testing.T) {
-	r := reg(canonical.MCPServer{Name: "remote", URL: "https://example.com"})
+	r := reg(canonical.MCPServer{
+		Name:    "remote",
+		URL:     "https://example.com",
+		Headers: map[string]string{"Authorization": "Bearer ${MCP_TOKEN}"},
+	})
 	out := BuildMCPMapStyled(r, MCPClaudeStyle)
 	e := out["remote"].(map[string]any)
 	assert.Equal(t, "https://example.com", e["url"])
 	assert.Equal(t, "http", e["type"])
+	assert.Equal(t, map[string]string{"Authorization": "Bearer ${MCP_TOKEN}"}, e["headers"])
 }
 
 func TestBuildMCPMapStyledCrushStdio(t *testing.T) {
@@ -70,12 +75,17 @@ func TestBuildMCPMapStyledOpencodeLocal(t *testing.T) {
 }
 
 func TestBuildMCPMapStyledOpencodeRemote(t *testing.T) {
-	r := reg(canonical.MCPServer{Name: "r", URL: "https://example.com"})
+	r := reg(canonical.MCPServer{
+		Name:    "r",
+		URL:     "https://example.com",
+		Headers: map[string]string{"X-Tenant": "tenant-a"},
+	})
 	out := BuildMCPMapStyled(r, MCPOpencodeStyle)
 	e := out["r"].(map[string]any)
 	assert.Equal(t, "remote", e["type"])
 	assert.Equal(t, true, e["enabled"])
 	assert.Equal(t, "https://example.com", e["url"])
+	assert.Equal(t, map[string]string{"X-Tenant": "tenant-a"}, e["headers"])
 }
 
 func TestBuildMCPMapStyledOpencodeEnv(t *testing.T) {

internal/adapters/cagent/cagent.go

@@ -19,21 +19,16 @@ import (
 const name = "cagent"
 
 // Adapter implements adapter.Adapter for the cagent harness.
-type Adapter struct{ home string }
+type Adapter struct {
+	*adapter.Base
+}
 
-// Option configures an Adapter.
+// WithHome overrides the home directory used to resolve target paths.
-type Option func(*Adapter)
+func WithHome(h string) adapter.BaseOption { return func(b *adapter.Base) { b.Home = h } }
-
-// WithHome overrides the home directory (defaults to os.UserHomeDir).
-func WithHome(h string) Option { return func(a *Adapter) { a.home = h } }
 
 // New returns a new Adapter with the given options applied.
-func New(opts ...Option) *Adapter {
+func New(opts ...adapter.BaseOption) *Adapter {
-	a := &Adapter{home: common.DefaultHome()}
+	return &Adapter{Base: adapter.NewBase(opts...)}
-	for _, o := range opts {
-		o(a)
-	}
-	return a
 }
 
 // Name returns the harness identifier.
@@ -46,6 +41,7 @@ func (a *Adapter) Capabilities() adapter.HarnessCapabilities {
 		ManagesModels:       true,
 		ManagesMCP:          true,
 		ManagesSkills:       false,
+		ManagesRules:        true,
 		ManagesInstructions: true,
 		HasBuiltInSub:       false,
 	}
@@ -53,19 +49,18 @@ func (a *Adapter) Capabilities() adapter.HarnessCapabilities {
 
 // Detect returns true when ~/.config/cagent/ exists.
 func (a *Adapter) Detect() bool {
-	_, err := os.Stat(filepath.Join(a.home, ".config", "cagent"))
+	_, err := os.Stat(filepath.Join(a.Home, ".config", "cagent"))
 	return err == nil
 }
 
 // Render produces a starter default.yaml for cagent.
 func (a *Adapter) Render(b *canonical.Bundle) (*adapter.FileSet, error) {
 	fs := adapter.NewFileSet()
-	cfgPath := filepath.Join(a.home, ".config", "cagent", "default.yaml")
+	cfgPath := filepath.Join(a.Home, ".config", "cagent", "default.yaml")
 
-	instructions := b.Instructions.Global
+	// cagent has no rules concept; the per-agent instruction (system prompt) is
-	if override, ok := b.Instructions.PerHarness[name]; ok && override != "" {
+	// the only sink, so fold rules into it.
-		instructions = override
+	instructions := b.InstructionTextWithRules(name)
-	}
 
 	mcps := map[string]any{}
 	for _, s := range b.MCP.Servers {

internal/adapters/cagent/rules_test.go

@@ -0,0 +1,37 @@
+package cagent
+
+import (
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/lukaszraczylo/harness-sync/internal/adapter"
+	"github.com/lukaszraczylo/harness-sync/internal/canonical"
+
+	"gopkg.in/yaml.v3"
+)
+
+func TestCagentFoldsRulesIntoInstruction(t *testing.T) {
+	home := t.TempDir()
+	b := &canonical.Bundle{
+		Instructions: canonical.Instructions{Global: "# global"},
+		Rules:        []canonical.Rule{{Name: "rust", Body: "# Rust\n\nno unwrap"}},
+	}
+	fs, err := New(WithHome(home)).Render(b)
+	require.NoError(t, err)
+	seen := map[string]adapter.File{}
+	fs.ForEach(func(f adapter.File) { seen[f.Dest] = f })
+
+	cfg := seen[filepath.Join(home, ".config", "cagent", "default.yaml")]
+	require.Equal(t, adapter.RenderedFile, cfg.Kind)
+
+	var parsed map[string]any
+	require.NoError(t, yaml.Unmarshal(cfg.Content, &parsed))
+	agents := parsed["agents"].(map[string]any)
+	def := agents["default"].(map[string]any)
+	instr := def["instruction"].(string)
+	assert.Contains(t, instr, "# global")
+	assert.Contains(t, instr, "no unwrap")
+}

internal/adapters/claudecode/claudecode.go

@@ -2,6 +2,7 @@
 package claudecode
 
 import (
+	"fmt"
 	"os"
 	"path/filepath"
 
@@ -14,22 +15,15 @@ const name = "claude-code"
 
 // Adapter implements adapter.Adapter for the claude-code harness.
 type Adapter struct {
-	home string
+	*adapter.Base
 }
 
-// Option configures an Adapter.
+// WithHome overrides the home directory used to resolve target paths.
-type Option func(*Adapter)
+func WithHome(h string) adapter.BaseOption { return func(b *adapter.Base) { b.Home = h } }
-
-// WithHome overrides the home directory (defaults to os.UserHomeDir).
-func WithHome(h string) Option { return func(a *Adapter) { a.home = h } }
 
 // New returns a new Adapter with the given options applied.
-func New(opts ...Option) *Adapter {
+func New(opts ...adapter.BaseOption) *Adapter {
-	a := &Adapter{home: common.DefaultHome()}
+	return &Adapter{Base: adapter.NewBase(opts...)}
-	for _, o := range opts {
-		o(a)
-	}
-	return a
 }
 
 // Name returns the harness identifier.
@@ -43,6 +37,8 @@ func (a *Adapter) Capabilities() adapter.HarnessCapabilities {
 		ManagesModels:       false,
 		ManagesMCP:          true,
 		ManagesSkills:       true,
+		ManagesAgents:       true,
+		ManagesRules:        true,
 		ManagesInstructions: true,
 		HasBuiltInSub:       true,
 	}
@@ -50,7 +46,7 @@ func (a *Adapter) Capabilities() adapter.HarnessCapabilities {
 
 // Detect returns true when ~/.claude exists.
 func (a *Adapter) Detect() bool {
-	_, err := os.Stat(filepath.Join(a.home, ".claude"))
+	_, err := os.Stat(filepath.Join(a.Home, ".claude"))
 	return err == nil
 }
 
@@ -59,7 +55,7 @@ func (a *Adapter) Detect() bool {
 // only manages skills/agents symlinks, CLAUDE.md, and MCP servers.
 func (a *Adapter) Render(b *canonical.Bundle) (*adapter.FileSet, error) {
 	fs := adapter.NewFileSet()
-	base := filepath.Join(a.home, ".claude")
+	base := filepath.Join(a.Home, ".claude")
 
 	fs.Add(adapter.File{
 		Dest:          filepath.Join(base, "skills"),
@@ -71,15 +67,19 @@ func (a *Adapter) Render(b *canonical.Bundle) (*adapter.FileSet, error) {
 		Kind:          adapter.SymlinkDir,
 		SymlinkTarget: filepath.Join(b.Root, "agents"),
 	})
+	// Claude Code natively auto-loads ~/.claude/rules/*.md (memory feature), so
+	// rules are delivered as their own directory symlink — NOT folded into
+	// CLAUDE.md — preserving each rule's optional path-scoping frontmatter.
+	fs.Add(adapter.File{
+		Dest:          filepath.Join(base, "rules"),
+		Kind:          adapter.SymlinkDir,
+		SymlinkTarget: filepath.Join(b.Root, "rules"),
+	})
 
-	instructions := b.Instructions.Global
-	if override, ok := b.Instructions.PerHarness[name]; ok && override != "" {
-		instructions = override
-	}
 	fs.Add(adapter.File{
 		Dest:    filepath.Join(base, "CLAUDE.md"),
 		Kind:    adapter.RenderedFile,
-		Content: []byte(instructions),
+		Content: []byte(b.InstructionText(name)),
 	})
 
 	// Claude Code reads MCP servers from two files on disk:
@@ -92,7 +92,10 @@ func (a *Adapter) Render(b *canonical.Bundle) (*adapter.FileSet, error) {
 	overlay := map[string]any{"mcpServers": mcpMap}
 
 	dedicatedPath := filepath.Join(base, "mcp_servers.json")
-	dedicatedExisting, _ := os.ReadFile(dedicatedPath)
+	dedicatedExisting, err := common.ReadExistingFile(dedicatedPath)
+	if err != nil {
+		return nil, fmt.Errorf("read %s: %w", dedicatedPath, err)
+	}
 	dedicatedMerged, err := common.MergeJSONKeys(dedicatedExisting, overlay)
 	if err != nil {
 		return nil, err
@@ -103,9 +106,12 @@ func (a *Adapter) Render(b *canonical.Bundle) (*adapter.FileSet, error) {
 		Content: dedicatedMerged,
 	})
 
-	livePath := filepath.Join(a.home, ".claude.json")
+	livePath := filepath.Join(a.Home, ".claude.json")
 	if _, err := os.Stat(livePath); err == nil {
-		liveExisting, _ := os.ReadFile(livePath)
+		liveExisting, err := common.ReadExistingFile(livePath)
+		if err != nil {
+			return nil, fmt.Errorf("read %s: %w", livePath, err)
+		}
 		liveMerged, err := common.MergeJSONKeys(liveExisting, overlay)
 		if err != nil {
 			return nil, err

internal/adapters/claudecode/import.go

@@ -32,6 +32,16 @@ func importFrom(home string) (*adapter.ImportResult, error) {
 		})
 	}
 
+	rules, err := common.ImportMarkdownTree(filepath.Join(base, "rules"), "")
+	if err != nil {
+		return nil, err
+	}
+	for _, r := range rules {
+		res.Rules = append(res.Rules, canonical.Rule{
+			Name: r.Name, Description: r.Description, Body: r.Body, Path: r.Path,
+		})
+	}
+
 	body, err := common.ReadIfExists(filepath.Join(base, "CLAUDE.md"))
 	if err != nil {
 		return nil, err

internal/adapters/claudecode/rules_test.go

@@ -0,0 +1,47 @@
+package claudecode
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/lukaszraczylo/harness-sync/internal/adapter"
+	"github.com/lukaszraczylo/harness-sync/internal/canonical"
+)
+
+func TestClaudeCodeRendersRulesSymlink(t *testing.T) {
+	home := t.TempDir()
+	ad := New(WithHome(home))
+	b := &canonical.Bundle{Root: "/canon"}
+	fs, err := ad.Render(b)
+	require.NoError(t, err)
+
+	seen := map[string]adapter.File{}
+	fs.ForEach(func(f adapter.File) { seen[f.Dest] = f })
+
+	rulesDest := filepath.Join(home, ".claude", "rules")
+	assert.Equal(t, adapter.SymlinkDir, seen[rulesDest].Kind)
+	assert.Equal(t, "/canon/rules", seen[rulesDest].SymlinkTarget)
+
+	// Rules are delivered natively as a directory — never folded into CLAUDE.md.
+	claudemd := string(seen[filepath.Join(home, ".claude", "CLAUDE.md")].Content)
+	assert.NotContains(t, claudemd, "/canon/rules")
+}
+
+func TestClaudeCodeImportsRules(t *testing.T) {
+	home := t.TempDir()
+	rulesDir := filepath.Join(home, ".claude", "rules")
+	require.NoError(t, os.MkdirAll(rulesDir, 0o750))
+	require.NoError(t, os.WriteFile(filepath.Join(rulesDir, "go.md"),
+		[]byte("# Go Rules\n\ngofmt always"), 0o600))
+
+	ad := New(WithHome(home))
+	res, err := ad.Import(home)
+	require.NoError(t, err)
+	require.Len(t, res.Rules, 1)
+	assert.Equal(t, "go", res.Rules[0].Name)
+	assert.Contains(t, res.Rules[0].Body, "gofmt always")
+}

internal/adapters/crush/crush.go

@@ -2,6 +2,8 @@
 package crush
 
 import (
+	"encoding/json"
+	"fmt"
 	"os"
 	"path/filepath"
 
@@ -13,21 +15,16 @@ import (
 const name = "crush"
 
 // Adapter implements adapter.Adapter for the crush harness.
-type Adapter struct{ home string }
+type Adapter struct {
+	*adapter.Base
+}
 
-// Option configures an Adapter.
+// WithHome overrides the home directory used to resolve target paths.
-type Option func(*Adapter)
+func WithHome(h string) adapter.BaseOption { return func(b *adapter.Base) { b.Home = h } }
-
-// WithHome overrides the home directory (defaults to os.UserHomeDir).
-func WithHome(h string) Option { return func(a *Adapter) { a.home = h } }
 
 // New returns a new Adapter with the given options applied.
-func New(opts ...Option) *Adapter {
+func New(opts ...adapter.BaseOption) *Adapter {
-	a := &Adapter{home: common.DefaultHome()}
+	return &Adapter{Base: adapter.NewBase(opts...)}
-	for _, o := range opts {
-		o(a)
-	}
-	return a
 }
 
 // Name returns the harness identifier.
@@ -40,14 +37,15 @@ func (a *Adapter) Capabilities() adapter.HarnessCapabilities {
 		ManagesModels:       true,
 		ManagesMCP:          true,
 		ManagesSkills:       true,
-		ManagesInstructions: false,
+		ManagesRules:        true,
+		ManagesInstructions: true,
 		HasBuiltInSub:       false,
 	}
 }
 
 // Detect returns true when ~/.config/crush exists.
 func (a *Adapter) Detect() bool {
-	_, err := os.Stat(filepath.Join(a.home, ".config", "crush"))
+	_, err := os.Stat(filepath.Join(a.Home, ".config", "crush"))
 	return err == nil
 }
 
@@ -56,7 +54,7 @@ func (a *Adapter) Detect() bool {
 // MCP key is "mcp" (not "mcpServers"); entries include a "type" field.
 func (a *Adapter) Render(b *canonical.Bundle) (*adapter.FileSet, error) {
 	fs := adapter.NewFileSet()
-	base := filepath.Join(a.home, ".config", "crush")
+	base := filepath.Join(a.Home, ".config", "crush")
 
 	fs.Add(adapter.File{
 		Dest:          filepath.Join(base, "skills"),
@@ -64,9 +62,25 @@ func (a *Adapter) Render(b *canonical.Bundle) (*adapter.FileSet, error) {
 		SymlinkTarget: filepath.Join(b.Root, "skills"),
 	})
 
+	// crush has no global instructions file and no rules directory: it loads
+	// context from the files listed in options.context_paths (defaults are always
+	// prepended; absolute paths load verbatim; the global config applies to every
+	// project). Write a global AGENTS.md with rules folded in, and register its
+	// absolute path so crush loads it in every session.
+	agentsMD := filepath.Join(base, "AGENTS.md")
+	fs.Add(adapter.File{
+		Dest:    agentsMD,
+		Kind:    adapter.RenderedFile,
+		Content: []byte(b.InstructionTextWithRules(name)),
+	})
+
 	cfgPath := filepath.Join(base, "crush.json")
-	existing, _ := os.ReadFile(cfgPath)
+	existing, err := common.ReadExistingFile(cfgPath)
+	if err != nil {
+		return nil, fmt.Errorf("read %s: %w", cfgPath, err)
+	}
 	overlay := map[string]any{}
+	overlay["options"] = crushOptionsWithContextPath(existing, agentsMD)
 	if providers := common.ProvidersAsCrushMap(&b.Profile); len(providers) > 0 {
 		overlay["providers"] = providers
 	}
@@ -90,6 +104,34 @@ func (a *Adapter) Render(b *canonical.Bundle) (*adapter.FileSet, error) {
 	return fs, nil
 }
 
+// crushOptionsWithContextPath returns the crush "options" object with contextFile
+// added to options.context_paths, preserving every other existing option key
+// (lsp, permissions, …). crush always prepends its built-in default context
+// paths at load time, so only the extra path is set here. Idempotent.
+func crushOptionsWithContextPath(existing []byte, contextFile string) map[string]any {
+	opts := map[string]any{}
+	if len(existing) > 0 {
+		var raw map[string]any
+		clean := common.StripJSONComments(string(existing))
+		if json.Unmarshal([]byte(clean), &raw) == nil {
+			if o, ok := raw["options"].(map[string]any); ok {
+				opts = o
+			}
+		}
+	}
+	var paths []any
+	if existingPaths, ok := opts["context_paths"].([]any); ok {
+		paths = existingPaths
+	}
+	for _, p := range paths {
+		if s, ok := p.(string); ok && s == contextFile {
+			return opts // already registered
+		}
+	}
+	opts["context_paths"] = append(paths, contextFile)
+	return opts
+}
+
 // Import reads crush config from home and returns a canonical ImportResult.
 func (a *Adapter) Import(home string) (*adapter.ImportResult, error) {
 	return importFrom(home)

internal/adapters/crush/rules_test.go

@@ -0,0 +1,83 @@
+package crush
+
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/lukaszraczylo/harness-sync/internal/adapter"
+	"github.com/lukaszraczylo/harness-sync/internal/canonical"
+)
+
+func renderCrush(t *testing.T, home string, b *canonical.Bundle) map[string]adapter.File {
+	t.Helper()
+	fs, err := New(WithHome(home)).Render(b)
+	require.NoError(t, err)
+	seen := map[string]adapter.File{}
+	fs.ForEach(func(f adapter.File) { seen[f.Dest] = f })
+	return seen
+}
+
+func TestCrushWritesAGENTSAndRegistersContextPath(t *testing.T) {
+	home := t.TempDir()
+	b := &canonical.Bundle{
+		Root:         "/canon",
+		Instructions: canonical.Instructions{Global: "# global"},
+		Rules:        []canonical.Rule{{Name: "sec", Body: "# Security\n\nno secrets in code"}},
+	}
+	seen := renderCrush(t, home, b)
+
+	base := filepath.Join(home, ".config", "crush")
+	agentsMD := filepath.Join(base, "AGENTS.md")
+	assert.Equal(t, adapter.RenderedFile, seen[agentsMD].Kind)
+	body := string(seen[agentsMD].Content)
+	assert.Contains(t, body, "# global")
+	assert.Contains(t, body, "no secrets in code")
+
+	var cfg map[string]any
+	require.NoError(t, json.Unmarshal(seen[filepath.Join(base, "crush.json")].Content, &cfg))
+	opts := cfg["options"].(map[string]any)
+	paths := opts["context_paths"].([]any)
+	assert.Contains(t, paths, agentsMD, "absolute AGENTS.md path must be registered for global load")
+}
+
+func TestCrushPreservesExistingOptionsAndIsIdempotent(t *testing.T) {
+	home := t.TempDir()
+	base := filepath.Join(home, ".config", "crush")
+	require.NoError(t, os.MkdirAll(base, 0o750))
+	agentsMD := filepath.Join(base, "AGENTS.md")
+
+	// Existing crush.json with other options keys and a pre-existing context path
+	// (including our own — second apply must not duplicate it).
+	existing := map[string]any{
+		"options": map[string]any{
+			"context_paths": []any{"PROJECT.md", agentsMD},
+			"lsp":           map[string]any{"go": true},
+		},
+	}
+	body, _ := json.Marshal(existing)
+	require.NoError(t, os.WriteFile(filepath.Join(base, "crush.json"), body, 0o600))
+
+	seen := renderCrush(t, home, &canonical.Bundle{Root: "/canon"})
+
+	var cfg map[string]any
+	require.NoError(t, json.Unmarshal(seen[filepath.Join(base, "crush.json")].Content, &cfg))
+	opts := cfg["options"].(map[string]any)
+
+	// Other option keys survive.
+	assert.Contains(t, opts, "lsp")
+	// Pre-existing user path survives; ours is present exactly once (idempotent).
+	paths := opts["context_paths"].([]any)
+	count := 0
+	for _, p := range paths {
+		if p == agentsMD {
+			count++
+		}
+	}
+	assert.Equal(t, 1, count, "our context path must not be duplicated on re-apply")
+	assert.Contains(t, paths, "PROJECT.md")
+}

internal/adapters/goose/goose.go

@@ -10,6 +10,7 @@
 package goose
 
 import (
+	"fmt"
 	"os"
 	"path/filepath"
 	"strings"
@@ -22,21 +23,16 @@ import (
 const name = "goose"
 
 // Adapter implements adapter.Adapter for the Goose harness.
-type Adapter struct{ home string }
+type Adapter struct {
+	*adapter.Base
+}
 
-// Option configures an Adapter.
+// WithHome overrides the home directory used to resolve target paths.
-type Option func(*Adapter)
+func WithHome(h string) adapter.BaseOption { return func(b *adapter.Base) { b.Home = h } }
-
-// WithHome overrides the home directory (defaults to os.UserHomeDir).
-func WithHome(h string) Option { return func(a *Adapter) { a.home = h } }
 
 // New returns a new Adapter with the given options applied.
-func New(opts ...Option) *Adapter {
+func New(opts ...adapter.BaseOption) *Adapter {
-	a := &Adapter{home: common.DefaultHome()}
+	return &Adapter{Base: adapter.NewBase(opts...)}
-	for _, o := range opts {
-		o(a)
-	}
-	return a
 }
 
 // Name returns the harness identifier.
@@ -49,14 +45,15 @@ func (a *Adapter) Capabilities() adapter.HarnessCapabilities {
 		ManagesModels:       true,
 		ManagesMCP:          true,
 		ManagesSkills:       true,
-		ManagesInstructions: false,
+		ManagesRules:        true,
+		ManagesInstructions: true,
 		HasBuiltInSub:       false,
 	}
 }
 
 // Detect returns true when ~/.config/goose/ exists.
 func (a *Adapter) Detect() bool {
-	_, err := os.Stat(filepath.Join(a.home, ".config", "goose"))
+	_, err := os.Stat(filepath.Join(a.Home, ".config", "goose"))
 	return err == nil
 }
 
@@ -67,23 +64,26 @@ func (a *Adapter) Detect() bool {
 // also added to the FileSet so goose can load the provider on first run.
 func (a *Adapter) Render(b *canonical.Bundle) (*adapter.FileSet, error) {
 	fs := adapter.NewFileSet()
-	cfgPath := filepath.Join(a.home, ".config", "goose", "config.yaml")
+	cfgPath := filepath.Join(a.Home, ".config", "goose", "config.yaml")
 
 	// goose reads skills from ~/.agents/skills/<name>/SKILL.md (open Agent Skills spec)
 	fs.Add(adapter.File{
-		Dest:          filepath.Join(a.home, ".agents", "skills"),
+		Dest:          filepath.Join(a.Home, ".agents", "skills"),
 		Kind:          adapter.SymlinkDir,
 		SymlinkTarget: filepath.Join(b.Root, "skills"),
 	})
 
-	existing, _ := os.ReadFile(cfgPath)
+	existing, err := common.ReadExistingFile(cfgPath)
+	if err != nil {
+		return nil, fmt.Errorf("read %s: %w", cfgPath, err)
+	}
 
 	provider, model := splitProviderModel(b.Profile.Gateway.DefaultModel)
 	if b.Profile.Gateway.URL != "" {
 		// Emit the custom provider JSON file.
 		body, providerName := common.GooseCustomProviderFile(&b.Profile)
 		if body != nil {
-			cpDir := filepath.Join(a.home, ".config", "goose", "custom_providers")
+			cpDir := filepath.Join(a.Home, ".config", "goose", "custom_providers")
 			fs.Add(adapter.File{
 				Dest:    filepath.Join(cpDir, providerName+".json"),
 				Kind:    adapter.RenderedFile,
@@ -114,6 +114,16 @@ func (a *Adapter) Render(b *canonical.Bundle) (*adapter.FileSet, error) {
 		Content: merged,
 	})
 
+	// goose has no native rules directory; ~/.config/goose/.goosehints is the
+	// global hints file applied to every session, so fold rules into it.
+	if hints := b.InstructionTextWithRules(name); hints != "" {
+		fs.Add(adapter.File{
+			Dest:    filepath.Join(a.Home, ".config", "goose", ".goosehints"),
+			Kind:    adapter.RenderedFile,
+			Content: []byte(hints),
+		})
+	}
+
 	return fs, nil
 }
 

internal/adapters/goose/rules_test.go

@@ -0,0 +1,31 @@
+package goose
+
+import (
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/lukaszraczylo/harness-sync/internal/adapter"
+	"github.com/lukaszraczylo/harness-sync/internal/canonical"
+)
+
+func TestGooseFoldsRulesIntoGoosehints(t *testing.T) {
+	home := t.TempDir()
+	b := &canonical.Bundle{
+		Instructions: canonical.Instructions{Global: "# global"},
+		Rules:        []canonical.Rule{{Name: "k8s", Body: "# Kube\n\nlabel everything"}},
+	}
+	fs, err := New(WithHome(home)).Render(b)
+	require.NoError(t, err)
+	seen := map[string]adapter.File{}
+	fs.ForEach(func(f adapter.File) { seen[f.Dest] = f })
+
+	hints := filepath.Join(home, ".config", "goose", ".goosehints")
+	require.Contains(t, seen, hints)
+	assert.Equal(t, adapter.RenderedFile, seen[hints].Kind)
+	body := string(seen[hints].Content)
+	assert.Contains(t, body, "# global")
+	assert.Contains(t, body, "label everything")
+}

internal/adapters/kilo/kilo.go

@@ -3,6 +3,7 @@ package kilo
 
 import (
 	"encoding/json"
+	"fmt"
 	"maps"
 	"os"
 	"path/filepath"
@@ -16,22 +17,15 @@ const name = "kilo"
 
 // Adapter implements adapter.Adapter for the kilo harness.
 type Adapter struct {
-	home string
+	*adapter.Base
 }
 
-// Option configures an Adapter.
+// WithHome overrides the home directory used to resolve target paths.
-type Option func(*Adapter)
+func WithHome(h string) adapter.BaseOption { return func(b *adapter.Base) { b.Home = h } }
-
-// WithHome overrides the home directory (defaults to os.UserHomeDir).
-func WithHome(h string) Option { return func(a *Adapter) { a.home = h } }
 
 // New returns a new Adapter with the given options applied.
-func New(opts ...Option) *Adapter {
+func New(opts ...adapter.BaseOption) *Adapter {
-	a := &Adapter{home: common.DefaultHome()}
+	return &Adapter{Base: adapter.NewBase(opts...)}
-	for _, o := range opts {
-		o(a)
-	}
-	return a
 }
 
 // Name returns the harness identifier.
@@ -44,14 +38,16 @@ func (a *Adapter) Capabilities() adapter.HarnessCapabilities {
 		ManagesModels:       true,
 		ManagesMCP:          true,
 		ManagesSkills:       true,
-		ManagesInstructions: false,
+		ManagesAgents:       true,
+		ManagesRules:        true,
+		ManagesInstructions: true,
 		HasBuiltInSub:       false,
 	}
 }
 
 // Detect returns true when ~/.config/kilo exists.
 func (a *Adapter) Detect() bool {
-	_, err := os.Stat(filepath.Join(a.home, ".config", "kilo"))
+	_, err := os.Stat(filepath.Join(a.Home, ".config", "kilo"))
 	return err == nil
 }
 
@@ -62,22 +58,35 @@ func (a *Adapter) Detect() bool {
 // No "providers" key — kilo has no such concept.
 func (a *Adapter) Render(b *canonical.Bundle) (*adapter.FileSet, error) {
 	fs := adapter.NewFileSet()
-	base := filepath.Join(a.home, ".config", "kilo")
+	base := filepath.Join(a.Home, ".config", "kilo")
 
+	// Kilo CLI reads global markdown subagents from ~/.config/kilo/agents/<name>.md
+	// (PLURAL — the singular "agent/" used by older OpenCode-fork builds is a
+	// silent no-op on current Kilo).
 	fs.Add(adapter.File{
-		Dest:          filepath.Join(base, "agent"),
+		Dest:          filepath.Join(base, "agents"),
 		Kind:          adapter.SymlinkDir,
 		SymlinkTarget: filepath.Join(b.Root, "agents"),
 	})
 	// kilo reads skills from ~/.kilo/skills/<name>/SKILL.md
 	fs.Add(adapter.File{
-		Dest:          filepath.Join(a.home, ".kilo", "skills"),
+		Dest:          filepath.Join(a.Home, ".kilo", "skills"),
 		Kind:          adapter.SymlinkDir,
 		SymlinkTarget: filepath.Join(b.Root, "skills"),
 	})
+	// kilo has no global rules directory; ~/.config/kilo/AGENTS.md is the
+	// always-on global instructions file, so fold rules into it.
+	fs.Add(adapter.File{
+		Dest:    filepath.Join(base, "AGENTS.md"),
+		Kind:    adapter.RenderedFile,
+		Content: []byte(b.InstructionTextWithRules(name)),
+	})
 
 	cfgPath := filepath.Join(base, "kilo.json")
-	existing, _ := os.ReadFile(cfgPath)
+	existing, err := common.ReadExistingFile(cfgPath)
+	if err != nil {
+		return nil, fmt.Errorf("read %s: %w", cfgPath, err)
+	}
 	modelStr := common.KiloModelString(&b.Profile)
 	overlay := map[string]any{}
 	if providers := common.ProvidersAsMap(&b.Profile); len(providers) > 0 {

internal/adapters/kilo/kilo_test.go

@@ -33,7 +33,8 @@ func TestKiloRender(t *testing.T) {
 	seen := map[string]adapter.File{}
 	fs.ForEach(func(f adapter.File) { seen[f.Dest] = f })
 
-	agentDest := filepath.Join(home, ".config", "kilo", "agent")
+	// Global markdown subagents dir is PLURAL "agents" on current Kilo CLI.
+	agentDest := filepath.Join(home, ".config", "kilo", "agents")
 	assert.Equal(t, adapter.SymlinkDir, seen[agentDest].Kind)
 	assert.Equal(t, "/canon/agents", seen[agentDest].SymlinkTarget)
 

internal/adapters/kilo/rules_test.go

@@ -0,0 +1,32 @@
+package kilo
+
+import (
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/lukaszraczylo/harness-sync/internal/adapter"
+	"github.com/lukaszraczylo/harness-sync/internal/canonical"
+)
+
+func TestKiloFoldsRulesIntoAGENTS(t *testing.T) {
+	home := t.TempDir()
+	b := &canonical.Bundle{
+		Root:         "/canon",
+		Instructions: canonical.Instructions{Global: "# global"},
+		Rules:        []canonical.Rule{{Name: "py", Body: "# Py\n\ntype hints"}},
+	}
+	fs, err := New(WithHome(home)).Render(b)
+	require.NoError(t, err)
+	seen := map[string]adapter.File{}
+	fs.ForEach(func(f adapter.File) { seen[f.Dest] = f })
+
+	agentsMD := filepath.Join(home, ".config", "kilo", "AGENTS.md")
+	require.Contains(t, seen, agentsMD)
+	assert.Equal(t, adapter.RenderedFile, seen[agentsMD].Kind)
+	body := string(seen[agentsMD].Content)
+	assert.Contains(t, body, "# global")
+	assert.Contains(t, body, "type hints")
+}

internal/adapters/opencode/import.go

@@ -5,12 +5,23 @@ import (
 
 	"github.com/lukaszraczylo/harness-sync/internal/adapter"
 	"github.com/lukaszraczylo/harness-sync/internal/adapter/common"
+	"github.com/lukaszraczylo/harness-sync/internal/canonical"
 )
 
 func importFrom(home string) (*adapter.ImportResult, error) {
 	base := filepath.Join(home, ".config", "opencode")
 	res := &adapter.ImportResult{}
 
+	agents, err := common.ImportMarkdownTree(filepath.Join(base, "agents"), "")
+	if err != nil {
+		return nil, err
+	}
+	for _, a := range agents {
+		res.Agents = append(res.Agents, canonical.Agent{
+			Name: a.Name, Description: a.Description, Body: a.Body, Path: a.Path,
+		})
+	}
+
 	cfgBody, err := common.ReadIfExists(filepath.Join(base, "opencode.jsonc"))
 	if err != nil {
 		return nil, err

internal/adapters/opencode/opencode.go

@@ -3,6 +3,7 @@ package opencode
 
 import (
 	"encoding/json"
+	"fmt"
 	"os"
 	"path/filepath"
 
@@ -14,21 +15,16 @@ import (
 const name = "opencode"
 
 // Adapter implements adapter.Adapter for the opencode harness.
-type Adapter struct{ home string }
+type Adapter struct {
+	*adapter.Base
+}
 
-// Option configures an Adapter.
+// WithHome overrides the home directory used to resolve target paths.
-type Option func(*Adapter)
+func WithHome(h string) adapter.BaseOption { return func(b *adapter.Base) { b.Home = h } }
-
-// WithHome overrides the home directory (defaults to os.UserHomeDir).
-func WithHome(h string) Option { return func(a *Adapter) { a.home = h } }
 
 // New returns a new Adapter with the given options applied.
-func New(opts ...Option) *Adapter {
+func New(opts ...adapter.BaseOption) *Adapter {
-	a := &Adapter{home: common.DefaultHome()}
+	return &Adapter{Base: adapter.NewBase(opts...)}
-	for _, o := range opts {
-		o(a)
-	}
-	return a
 }
 
 // Name returns the harness identifier.
@@ -41,6 +37,8 @@ func (a *Adapter) Capabilities() adapter.HarnessCapabilities {
 		ManagesModels:       true,
 		ManagesMCP:          true,
 		ManagesSkills:       true,
+		ManagesAgents:       true,
+		ManagesRules:        true,
 		ManagesInstructions: true,
 		HasBuiltInSub:       false,
 	}
@@ -48,7 +46,7 @@ func (a *Adapter) Capabilities() adapter.HarnessCapabilities {
 
 // Detect returns true when ~/.config/opencode exists.
 func (a *Adapter) Detect() bool {
-	_, err := os.Stat(filepath.Join(a.home, ".config", "opencode"))
+	_, err := os.Stat(filepath.Join(a.Home, ".config", "opencode"))
 	return err == nil
 }
 
@@ -58,7 +56,7 @@ func (a *Adapter) Detect() bool {
 // "mcp" (map with type: local|remote entries).
 func (a *Adapter) Render(b *canonical.Bundle) (*adapter.FileSet, error) {
 	fs := adapter.NewFileSet()
-	base := filepath.Join(a.home, ".config", "opencode")
+	base := filepath.Join(a.Home, ".config", "opencode")
 
 	// opencode reads skills from ~/.config/opencode/skills/<name>/SKILL.md
 	fs.Add(adapter.File{
@@ -66,9 +64,18 @@ func (a *Adapter) Render(b *canonical.Bundle) (*adapter.FileSet, error) {
 		Kind:          adapter.SymlinkDir,
 		SymlinkTarget: filepath.Join(b.Root, "skills"),
 	})
+	// opencode reads markdown subagents from ~/.config/opencode/agents/<name>.md
+	fs.Add(adapter.File{
+		Dest:          filepath.Join(base, "agents"),
+		Kind:          adapter.SymlinkDir,
+		SymlinkTarget: filepath.Join(b.Root, "agents"),
+	})
 
 	cfgPath := filepath.Join(base, "opencode.jsonc")
-	existing, _ := os.ReadFile(cfgPath)
+	existing, err := common.ReadExistingFile(cfgPath)
+	if err != nil {
+		return nil, fmt.Errorf("read %s: %w", cfgPath, err)
+	}
 
 	// Build the provider map, then absorb any existing providers at the same
 	// gateway URL so duplicates don't accumulate across apply runs.
@@ -105,14 +112,12 @@ func (a *Adapter) Render(b *canonical.Bundle) (*adapter.FileSet, error) {
 		Content: merged,
 	})
 
-	instructions := b.Instructions.Global
+	// opencode has no native rules directory; rule content reaches it only via
-	if override, ok := b.Instructions.PerHarness[name]; ok && override != "" {
+	// the global AGENTS.md instructions file, so fold the rules in here.
-		instructions = override
-	}
 	fs.Add(adapter.File{
 		Dest:    filepath.Join(base, "AGENTS.md"),
 		Kind:    adapter.RenderedFile,
-		Content: []byte(instructions),
+		Content: []byte(b.InstructionTextWithRules(name)),
 	})
 
 	return fs, nil

internal/adapters/opencode/rules_test.go

@@ -0,0 +1,52 @@
+package opencode
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/lukaszraczylo/harness-sync/internal/adapter"
+	"github.com/lukaszraczylo/harness-sync/internal/canonical"
+)
+
+func TestOpencodeRendersAgentsSymlinkAndFoldsRules(t *testing.T) {
+	home := t.TempDir()
+	ad := New(WithHome(home))
+	b := &canonical.Bundle{
+		Root:         "/canon",
+		Instructions: canonical.Instructions{Global: "# global"},
+		Rules:        []canonical.Rule{{Name: "go", Body: "# Go\n\ngofmt always"}},
+	}
+	fs, err := ad.Render(b)
+	require.NoError(t, err)
+
+	seen := map[string]adapter.File{}
+	fs.ForEach(func(f adapter.File) { seen[f.Dest] = f })
+
+	agentsDest := filepath.Join(home, ".config", "opencode", "agents")
+	assert.Equal(t, adapter.SymlinkDir, seen[agentsDest].Kind)
+	assert.Equal(t, "/canon/agents", seen[agentsDest].SymlinkTarget)
+
+	agentsMD := filepath.Join(home, ".config", "opencode", "AGENTS.md")
+	assert.Equal(t, adapter.RenderedFile, seen[agentsMD].Kind)
+	body := string(seen[agentsMD].Content)
+	assert.Contains(t, body, "# global")
+	assert.Contains(t, body, "gofmt always")
+}
+
+func TestOpencodeImportsAgents(t *testing.T) {
+	home := t.TempDir()
+	agentsDir := filepath.Join(home, ".config", "opencode", "agents")
+	require.NoError(t, os.MkdirAll(agentsDir, 0o750))
+	require.NoError(t, os.WriteFile(filepath.Join(agentsDir, "review.md"),
+		[]byte("---\nname: review\ndescription: d\n---\nbody"), 0o600))
+
+	ad := New(WithHome(home))
+	res, err := ad.Import(home)
+	require.NoError(t, err)
+	require.Len(t, res.Agents, 1)
+	assert.Equal(t, "review", res.Agents[0].Name)
+}

internal/adapters/zed/rules_test.go

@@ -0,0 +1,31 @@
+package zed
+
+import (
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/lukaszraczylo/harness-sync/internal/adapter"
+	"github.com/lukaszraczylo/harness-sync/internal/canonical"
+)
+
+func TestZedFoldsRulesIntoAGENTS(t *testing.T) {
+	home := t.TempDir()
+	b := &canonical.Bundle{
+		Instructions: canonical.Instructions{Global: "# global"},
+		Rules:        []canonical.Rule{{Name: "ts", Body: "# TS\n\nstrict mode"}},
+	}
+	fs, err := New(WithHome(home)).Render(b)
+	require.NoError(t, err)
+	seen := map[string]adapter.File{}
+	fs.ForEach(func(f adapter.File) { seen[f.Dest] = f })
+
+	agentsMD := filepath.Join(home, ".config", "zed", "AGENTS.md")
+	require.Contains(t, seen, agentsMD)
+	assert.Equal(t, adapter.RenderedFile, seen[agentsMD].Kind)
+	body := string(seen[agentsMD].Content)
+	assert.Contains(t, body, "# global")
+	assert.Contains(t, body, "strict mode")
+}

internal/adapters/zed/zed.go

@@ -7,6 +7,7 @@ package zed
 
 import (
 	"encoding/json"
+	"fmt"
 	"os"
 	"path/filepath"
 
@@ -18,21 +19,16 @@ import (
 const name = "zed"
 
 // Adapter implements adapter.Adapter for the Zed harness.
-type Adapter struct{ home string }
+type Adapter struct {
+	*adapter.Base
+}
 
-// Option configures an Adapter.
+// WithHome overrides the home directory used to resolve target paths.
-type Option func(*Adapter)
+func WithHome(h string) adapter.BaseOption { return func(b *adapter.Base) { b.Home = h } }
-
-// WithHome overrides the home directory (defaults to os.UserHomeDir).
-func WithHome(h string) Option { return func(a *Adapter) { a.home = h } }
 
 // New returns a new Adapter with the given options applied.
-func New(opts ...Option) *Adapter {
+func New(opts ...adapter.BaseOption) *Adapter {
-	a := &Adapter{home: common.DefaultHome()}
+	return &Adapter{Base: adapter.NewBase(opts...)}
-	for _, o := range opts {
-		o(a)
-	}
-	return a
 }
 
 // Name returns the harness identifier.
@@ -46,14 +42,15 @@ func (a *Adapter) Capabilities() adapter.HarnessCapabilities {
 		ManagesModels:       true,
 		ManagesMCP:          false, // Agent panel uses Extensions; context_servers key causes serde parse errors
 		ManagesSkills:       false,
-		ManagesInstructions: false,
+		ManagesRules:        true,
+		ManagesInstructions: true,
 		HasBuiltInSub:       false,
 	}
 }
 
 // Detect returns true when ~/.config/zed/ exists.
 func (a *Adapter) Detect() bool {
-	_, err := os.Stat(filepath.Join(a.home, ".config", "zed"))
+	_, err := os.Stat(filepath.Join(a.Home, ".config", "zed"))
 	return err == nil
 }
 
@@ -68,8 +65,11 @@ func (a *Adapter) Detect() bool {
 // pre-existing parse errors from user-configured entries.
 func (a *Adapter) Render(b *canonical.Bundle) (*adapter.FileSet, error) {
 	fs := adapter.NewFileSet()
-	cfgPath := filepath.Join(a.home, ".config", "zed", "settings.json")
+	cfgPath := filepath.Join(a.Home, ".config", "zed", "settings.json")
-	existing, _ := os.ReadFile(cfgPath)
+	existing, err := common.ReadExistingFile(cfgPath)
+	if err != nil {
+		return nil, fmt.Errorf("read %s: %w", cfgPath, err)
+	}
 
 	// Set context_servers to nil so MergeJSONKeys removes the key entirely,
 	// clearing any entries that trigger the serde ContextServerSettingsContent bug.
@@ -98,6 +98,17 @@ func (a *Adapter) Render(b *canonical.Bundle) (*adapter.FileSet, error) {
 		NoMerge: true,
 	})
 
+	// Zed reads personal/global instructions from ~/.config/zed/AGENTS.md
+	// (always-on for the Agent across all projects). Zed has no rules directory,
+	// so fold rules into it.
+	if instr := b.InstructionTextWithRules(name); instr != "" {
+		fs.Add(adapter.File{
+			Dest:    filepath.Join(a.Home, ".config", "zed", "AGENTS.md"),
+			Kind:    adapter.RenderedFile,
+			Content: []byte(instr),
+		})
+	}
+
 	return fs, nil
 }
 

internal/apply/apply.go

@@ -9,6 +9,7 @@ import (
 	"path/filepath"
 
 	"github.com/lukaszraczylo/harness-sync/internal/adapter"
+	"github.com/lukaszraczylo/harness-sync/internal/adapter/common"
 	"github.com/lukaszraczylo/harness-sync/internal/canonical"
 	"github.com/lukaszraczylo/harness-sync/internal/gitx"
 	"github.com/lukaszraczylo/harness-sync/internal/merge"
@@ -42,6 +43,11 @@ type Action struct {
 // Run renders all adapters and writes their FileSets to disk.
 // Conflicts are recorded as <dest>.rej files; processing continues past conflicts.
 //
+// When Options.Repo is nil the canonical repo is auto-opened from Bundle.Root.
+// If that directory is not a git repository the commit step is silently
+// skipped — useful for one-off renders (CI smoke tests, dry-runs) where
+// initialising a repo would be more surprising than useful.
+//
 // IMPORTANT: harness-sync intentionally does NOT resolve ${VAR} references in
 // canonical configs. Every supported harness performs its own env-var
 // expansion at MCP launch / config-load time, so resolving here would only
@@ -66,13 +72,30 @@ func Run(opt Options) (*Report, error) {
 			return rep, renderErr
 		}
 	}
-	if !opt.DryRun && rep.Written > 0 && opt.Repo != nil {
+	if opt.DryRun || rep.Written == 0 {
-		if err := opt.Repo.AddAll(); err != nil {
+		return rep, nil
+	}
+	repo := opt.Repo
+	if repo == nil {
+		repo = gitx.New(opt.Bundle.Root)
+	}
+	if !repo.IsRepo() {
+		return rep, nil
+	}
+	if err := repo.AddAll(); err != nil {
 		return rep, err
 	}
-		if err := opt.Repo.Commit(fmt.Sprintf("apply: %d files, %d conflicts", rep.Written, rep.Conflicts)); err != nil {
+	dirty, err := repo.HasStagedChanges()
+	if err != nil {
 		return rep, err
 	}
+	if !dirty {
+		// Nothing changed inside the canonical repo (writes were outside it,
+		// e.g. symlinks to temp dirs in tests). Skip the no-op commit.
+		return rep, nil
+	}
+	if err := repo.Commit(fmt.Sprintf("apply: %d files, %d conflicts", rep.Written, rep.Conflicts)); err != nil {
+		return rep, err
 	}
 	return rep, nil
 }
@@ -93,8 +116,14 @@ func statePath(root, adapterName, dest string) string {
 
 func handleRendered(opt Options, adapterName string, f adapter.File, rep *Report) error {
 	sp := statePath(opt.Bundle.Root, adapterName, f.Dest)
-	base, _ := os.ReadFile(sp)
+	base, readErr := common.ReadExistingFile(sp)
-	current, _ := os.ReadFile(f.Dest)
+	if readErr != nil {
+		return fmt.Errorf("read state %s: %w", sp, readErr)
+	}
+	current, readErr := common.ReadExistingFile(f.Dest)
+	if readErr != nil {
+		return fmt.Errorf("read target %s: %w", f.Dest, readErr)
+	}
 
 	if string(current) == string(f.Content) {
 		rep.Skipped++

internal/apply/apply_test.go

@@ -584,6 +584,160 @@ func TestApplyUnknownFileKind(t *testing.T) {
 	assert.Contains(t, err.Error(), "unknown file kind")
 }
 
+// ---------------------------------------------------------------------------
+// TestApplyPropagatesReadErrors — regression for the silent-read footgun.
+// A target file in a directory we can no longer read must surface as an
+// error from Run, not as a fast-forward overwrite.
+// ---------------------------------------------------------------------------
+
+func TestApplyPropagatesReadErrors(t *testing.T) {
+	if os.Geteuid() == 0 {
+		t.Skip("running as root; cannot test permission denial")
+	}
+	root := t.TempDir()
+	targetDir := t.TempDir()
+	target := filepath.Join(targetDir, "out.txt")
+	require.NoError(t, os.WriteFile(target, []byte("user-content\n"), 0o600))
+	require.NoError(t, initCanonical(root))
+
+	// Strip read perms on the target's parent so os.ReadFile fails.
+	require.NoError(t, os.Chmod(targetDir, 0o000))
+	t.Cleanup(func() { _ = os.Chmod(targetDir, 0o755) })
+
+	ad := &stubAdapter{name: "stub", files: []adapter.File{
+		{Dest: target, Kind: adapter.RenderedFile, Content: []byte("new-render\n")},
+	}}
+	_, err := Run(Options{
+		Bundle:   &canonical.Bundle{Root: root},
+		Adapters: []adapter.Adapter{ad},
+		Repo:     gitx.New(root),
+	})
+	require.Error(t, err)
+	assert.Contains(t, err.Error(), "read target")
+
+	// User's on-disk file must be untouched.
+	_ = os.Chmod(targetDir, 0o755)
+	body, rerr := os.ReadFile(target)
+	require.NoError(t, rerr)
+	assert.Equal(t, "user-content\n", string(body),
+		"target must not be overwritten when read fails")
+}
+
+// ---------------------------------------------------------------------------
+// TestApplyAutoOpensRepoFromBundleRoot — regression: callers no longer need
+// to pre-construct a *gitx.Repo. Run opens one from Bundle.Root, skips
+// commit gracefully when the root is not a git repo, and commits when it is.
+// ---------------------------------------------------------------------------
+
+func TestApplyAutoOpensRepoFromBundleRoot(t *testing.T) {
+	root := t.TempDir()
+	target := filepath.Join(t.TempDir(), "out.txt")
+	require.NoError(t, initCanonical(root))
+
+	ad := &stubAdapter{name: "stub", files: []adapter.File{
+		{Dest: target, Kind: adapter.RenderedFile, Content: []byte("auto\n")},
+	}}
+	// Intentionally pass Repo: nil — the new behaviour should open one itself.
+	rep, err := Run(Options{
+		Bundle:   &canonical.Bundle{Root: root},
+		Adapters: []adapter.Adapter{ad},
+	})
+	require.NoError(t, err)
+	assert.Equal(t, 1, rep.Written)
+
+	// git log should have a new commit from apply, on top of the init one.
+	out, gitErr := runGit(root, "log", "--oneline")
+	require.NoError(t, gitErr)
+	assert.GreaterOrEqual(t, countLines(out), 2)
+}
+
+// ---------------------------------------------------------------------------
+// TestApplyNoRepoSkipsCommit — when Bundle.Root isn't a git repo, Run must
+// still succeed (no error, no commit attempt). One-off renders / dry-runs.
+// ---------------------------------------------------------------------------
+
+func TestApplyNoRepoSkipsCommit(t *testing.T) {
+	root := t.TempDir() // NOT initCanonical — no .git
+	target := filepath.Join(t.TempDir(), "out.txt")
+
+	ad := &stubAdapter{name: "stub", files: []adapter.File{
+		{Dest: target, Kind: adapter.RenderedFile, Content: []byte("x\n")},
+	}}
+	rep, err := Run(Options{
+		Bundle:   &canonical.Bundle{Root: root},
+		Adapters: []adapter.Adapter{ad},
+	})
+	require.NoError(t, err)
+	assert.Equal(t, 1, rep.Written)
+	body, rerr := os.ReadFile(target)
+	require.NoError(t, rerr)
+	assert.Equal(t, "x\n", string(body))
+}
+
+// ---------------------------------------------------------------------------
+// TestApplySkipsNoOpCommit — symlinks at a path outside the canonical repo
+// do not write a state snapshot inside the repo (handleSymlink has no
+// state-tracking), so git has nothing to commit. apply.Run must detect
+// "no staged changes" and skip the commit instead of failing with
+// "nothing to commit" from git itself.
+// ---------------------------------------------------------------------------
+
+func TestApplySkipsNoOpCommit(t *testing.T) {
+	root := t.TempDir()
+	require.NoError(t, initCanonical(root))
+	targetDir := t.TempDir()
+	target := filepath.Join(targetDir, "outside-link")
+	real := filepath.Join(targetDir, "real.txt")
+	require.NoError(t, os.WriteFile(real, []byte("real\n"), 0o600))
+
+	ad := &stubAdapter{name: "stub", files: []adapter.File{
+		{Dest: target, Kind: adapter.SymlinkFile, SymlinkTarget: real},
+	}}
+	rep, err := Run(Options{
+		Bundle:   &canonical.Bundle{Root: root},
+		Adapters: []adapter.Adapter{ad},
+		// Repo: nil — auto-open from Bundle.Root (which IS a git repo).
+	})
+	require.NoError(t, err)
+	assert.Equal(t, 1, rep.Written)
+
+	// Symlink exists on disk.
+	got, lerr := os.Readlink(target)
+	require.NoError(t, lerr)
+	assert.Equal(t, real, got)
+
+	// No extra commit — still just the init commit. A failed "nothing to
+	// commit" would surface here as an error from Run.
+	out, gitErr := runGit(root, "log", "--oneline")
+	require.NoError(t, gitErr)
+	assert.Equal(t, 1, countLines(out),
+		"expected only the init commit; symlink outside canonical root should not create one")
+}
+
+// ---------------------------------------------------------------------------
+// TestApplyCommitMessageHasCounts — commit message includes the file and
+// conflict counts so the rollback story is auditable from git log alone.
+// ---------------------------------------------------------------------------
+
+func TestApplyCommitMessageHasCounts(t *testing.T) {
+	root := t.TempDir()
+	target := filepath.Join(t.TempDir(), "msg.txt")
+	require.NoError(t, initCanonical(root))
+
+	ad := &stubAdapter{name: "stub", files: []adapter.File{
+		{Dest: target, Kind: adapter.RenderedFile, Content: []byte("m\n")},
+	}}
+	_, err := Run(Options{
+		Bundle:   &canonical.Bundle{Root: root},
+		Adapters: []adapter.Adapter{ad},
+	})
+	require.NoError(t, err)
+
+	out, gitErr := runGit(root, "log", "-1", "--pretty=%s")
+	require.NoError(t, gitErr)
+	assert.Contains(t, out, "apply: 1 files, 0 conflicts")
+}
+
 // ---------------------------------------------------------------------------
 // helpers
 // ---------------------------------------------------------------------------

internal/canonical/instructions.go

@@ -0,0 +1,47 @@
+package canonical
+
+import "strings"
+
+// InstructionText returns the instruction body a harness should receive: the
+// per-harness override when one is set, otherwise the global instructions.
+func (b *Bundle) InstructionText(harness string) string {
+	if override, ok := b.Instructions.PerHarness[harness]; ok && override != "" {
+		return override
+	}
+	return b.Instructions.Global
+}
+
+// InstructionTextWithRules returns InstructionText for the harness with every
+// canonical rule body folded in. Harnesses without a native rules directory
+// (everything except claude-code/kilo) only receive rule content this way —
+// via their global instructions file. Rule frontmatter is stripped so the
+// folded output stays clean; bodies are joined in load order (deterministic).
+func (b *Bundle) InstructionTextWithRules(harness string) string {
+	base := b.InstructionText(harness)
+	var sb strings.Builder
+	sb.WriteString(base)
+	for _, r := range b.Rules {
+		body := strings.TrimSpace(stripFrontmatter(r.Body))
+		if body == "" {
+			continue
+		}
+		if sb.Len() > 0 {
+			sb.WriteString("\n\n")
+		}
+		sb.WriteString(body)
+	}
+	return sb.String()
+}
+
+// stripFrontmatter removes a leading YAML frontmatter block ("---\n…\n---") so
+// folding a rule into a plain instructions file does not leak its metadata.
+func stripFrontmatter(s string) string {
+	if !strings.HasPrefix(s, "---\n") {
+		return s
+	}
+	end := strings.Index(s[4:], "\n---")
+	if end == -1 {
+		return s
+	}
+	return strings.TrimPrefix(s[4+end+len("\n---"):], "\n")
+}

internal/canonical/instructions_test.go

@@ -0,0 +1,102 @@
+package canonical
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestInstructionText(t *testing.T) {
+	t.Run("global when no override", func(t *testing.T) {
+		t.Parallel()
+		b := Bundle{Instructions: Instructions{Global: "G"}}
+		assert.Equal(t, "G", b.InstructionText("zed"))
+	})
+	t.Run("per-harness override wins", func(t *testing.T) {
+		t.Parallel()
+		b := Bundle{Instructions: Instructions{Global: "G", PerHarness: map[string]string{"zed": "Z"}}}
+		assert.Equal(t, "Z", b.InstructionText("zed"))
+	})
+	t.Run("empty override falls back to global", func(t *testing.T) {
+		t.Parallel()
+		b := Bundle{Instructions: Instructions{Global: "G", PerHarness: map[string]string{"zed": ""}}}
+		assert.Equal(t, "G", b.InstructionText("zed"))
+	})
+	t.Run("empty everything", func(t *testing.T) {
+		t.Parallel()
+		b := Bundle{}
+		assert.Equal(t, "", b.InstructionText("zed"))
+	})
+}
+
+func TestInstructionTextWithRules(t *testing.T) {
+	t.Run("folds rules after global", func(t *testing.T) {
+		t.Parallel()
+		b := Bundle{
+			Instructions: Instructions{Global: "# Global"},
+			Rules: []Rule{
+				{Name: "a", Body: "# Rule A\n\nbe concise"},
+				{Name: "b", Body: "# Rule B\n\nbe safe"},
+			},
+		}
+		got := b.InstructionTextWithRules("opencode")
+		assert.Equal(t, "# Global\n\n# Rule A\n\nbe concise\n\n# Rule B\n\nbe safe", got)
+	})
+
+	t.Run("strips rule frontmatter", func(t *testing.T) {
+		t.Parallel()
+		b := Bundle{
+			Instructions: Instructions{Global: "G"},
+			Rules: []Rule{
+				{Name: "scoped", Body: "---\nname: scoped\npaths: \"**/*.go\"\n---\n# Go\n\ngofmt"},
+			},
+		}
+		got := b.InstructionTextWithRules("opencode")
+		assert.Equal(t, "G\n\n# Go\n\ngofmt", got)
+		assert.NotContains(t, got, "paths:")
+		assert.NotContains(t, got, "---")
+	})
+
+	t.Run("no rules returns plain instruction text", func(t *testing.T) {
+		t.Parallel()
+		b := Bundle{Instructions: Instructions{Global: "G"}}
+		assert.Equal(t, "G", b.InstructionTextWithRules("opencode"))
+	})
+
+	t.Run("empty global still emits rules", func(t *testing.T) {
+		t.Parallel()
+		b := Bundle{Rules: []Rule{{Name: "a", Body: "rule body"}}}
+		assert.Equal(t, "rule body", b.InstructionTextWithRules("opencode"))
+	})
+
+	t.Run("blank rule bodies are skipped", func(t *testing.T) {
+		t.Parallel()
+		b := Bundle{
+			Instructions: Instructions{Global: "G"},
+			Rules: []Rule{
+				{Name: "empty", Body: "   \n  "},
+				{Name: "real", Body: "keep"},
+			},
+		}
+		assert.Equal(t, "G\n\nkeep", b.InstructionTextWithRules("opencode"))
+	})
+}
+
+func TestStripFrontmatter(t *testing.T) {
+	tests := []struct {
+		name string
+		in   string
+		want string
+	}{
+		{"no frontmatter", "# Title\nbody", "# Title\nbody"},
+		{"with frontmatter", "---\nname: x\n---\n# Title", "# Title"},
+		{"unterminated frontmatter left intact", "---\nname: x\nbody", "---\nname: x\nbody"},
+		{"empty", "", ""},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+			assert.Equal(t, tt.want, stripFrontmatter(tt.in))
+		})
+	}
+}

internal/canonical/load.go

@@ -72,6 +72,14 @@ func LoadFS(fs fsx.FS, root string) (*Bundle, error) {
 		b.Agents = append(b.Agents, Agent(m))
 	}
 
+	rules, err := loadMarkdownDirFS(fs, filepath.Join(root, "rules"), "")
+	if err != nil {
+		return nil, err
+	}
+	for _, m := range rules {
+		b.Rules = append(b.Rules, Rule(m))
+	}
+
 	b.Instructions.PerHarness = map[string]string{}
 	body, err := readFileIfExistsFS(fs, filepath.Join(root, "instructions", "global.md"))
 	if err != nil {

internal/canonical/load_test.go

@@ -28,6 +28,10 @@ func TestLoad(t *testing.T) {
 	require.Len(t, b.Agents, 1)
 	assert.Equal(t, "sample", b.Agents[0].Name)
 
+	require.Len(t, b.Rules, 1)
+	assert.Equal(t, "sample-rule", b.Rules[0].Name)
+	assert.Contains(t, b.Rules[0].Body, "Always be concise.")
+
 	assert.Contains(t, b.Instructions.Global, "Be helpful.")
 }
 

internal/canonical/testdata/sample/rules/sample-rule.md

@@ -0,0 +1,3 @@
+# Sample Rule
+
+Always be concise.

internal/canonical/types.go

@@ -43,6 +43,7 @@ type MCPRegistry struct {
 
 type MCPServer struct {
 	Env       map[string]string `yaml:"env,omitempty"`
+	Headers   map[string]string `yaml:"headers,omitempty"`
 	Name      string            `yaml:"name"`
 	Command   string            `yaml:"command,omitempty"`
 	URL       string            `yaml:"url,omitempty"`
@@ -64,6 +65,16 @@ type Agent struct {
 	Path        string
 }
 
+// Rule is a topic-scoped instruction fragment (e.g. ~/.claude/rules/go.md).
+// Claude Code auto-loads a directory of these; harnesses without a native rules
+// directory receive the bodies folded into their global instructions file.
+type Rule struct {
+	Name        string
+	Description string
+	Body        string
+	Path        string
+}
+
 type Instructions struct {
 	PerHarness map[string]string
 	Global     string
@@ -76,6 +87,7 @@ type Bundle struct {
 	Profile      Profile
 	Skills       []Skill
 	Agents       []Agent
+	Rules        []Rule
 	MCP          MCPRegistry
 }
 

internal/cli/init.go

@@ -93,6 +93,7 @@ func runImport(cmd *cobra.Command, reg *adapter.Registry, root, home string, pic
 	}
 	seenSkills := map[string]bool{}
 	seenAgents := map[string]bool{}
+	seenRules := map[string]bool{}
 	seenMCP := map[string]bool{}
 	var instructions []string
 
@@ -121,6 +122,14 @@ func runImport(cmd *cobra.Command, reg *adapter.Registry, root, home string, pic
 			seenAgents[key] = true
 			bundle.Agents = append(bundle.Agents, a)
 		}
+		for _, r := range res.Rules {
+			key := r.Name + "|" + r.Body
+			if seenRules[key] {
+				continue
+			}
+			seenRules[key] = true
+			bundle.Rules = append(bundle.Rules, r)
+		}
 		for _, m := range res.MCP {
 			if seenMCP[m.Name] {
 				continue
@@ -153,8 +162,8 @@ func runImport(cmd *cobra.Command, reg *adapter.Registry, root, home string, pic
 		return err
 	}
 	_, _ = fmt.Fprintf(cmd.OutOrStdout(),
-		"imported from %v into %s\n  skills:       %d\n  agents:       %d\n  mcp servers:  %d\n  instructions: %d source(s)\n",
+		"imported from %v into %s\n  skills:       %d\n  agents:       %d\n  rules:        %d\n  mcp servers:  %d\n  instructions: %d source(s)\n",
-		picked, root, len(bundle.Skills), len(bundle.Agents), len(bundle.MCP.Servers), len(instructions),
+		picked, root, len(bundle.Skills), len(bundle.Agents), len(bundle.Rules), len(bundle.MCP.Servers), len(instructions),
 	)
 	return nil
 }
@@ -172,7 +181,7 @@ const importedProfileBody = "# harness-sync profile \xe2\x80\x94 generated by in
 	"models: []\n"
 
 func writeCanonical(root string, b *canonical.Bundle, picked []string) error {
-	for _, sub := range []string{"profiles", "skills", "agents", "instructions"} {
+	for _, sub := range []string{"profiles", "skills", "agents", "rules", "instructions"} {
 		if err := os.MkdirAll(filepath.Join(root, sub), 0o750); err != nil {
 			return err
 		}
@@ -233,6 +242,19 @@ func writeCanonical(root string, b *canonical.Bundle, picked []string) error {
 			return err
 		}
 	}
+	for _, r := range b.Rules {
+		rel := r.Path
+		if rel == "" {
+			rel = safeFilename(r.Name) + ".md"
+		}
+		path := filepath.Join(root, "rules", rel)
+		if err := os.MkdirAll(filepath.Dir(path), 0o750); err != nil {
+			return err
+		}
+		if err := os.WriteFile(path, []byte(r.Body), 0o600); err != nil {
+			return err
+		}
+	}
 	if b.Instructions.Global != "" {
 		if err := os.WriteFile(filepath.Join(root, "instructions", "global.md"),
 			[]byte(b.Instructions.Global), 0o600); err != nil {

internal/cli/init_test.go

@@ -53,6 +53,34 @@ func TestInitImportWritesCanonical(t *testing.T) {
 	require.NoError(t, err)
 }
 
+func TestInitImportsRules(t *testing.T) {
+	root := t.TempDir()
+	home := t.TempDir()
+
+	reg := adapter.NewRegistry()
+	reg.Register(&importableAdapter{
+		name: "stub",
+		res: &adapter.ImportResult{
+			Rules: []canonical.Rule{
+				{Name: "go", Body: "# Go\n\ngofmt", Path: "go.md"},
+				{Name: "py", Body: "# Py\n\ntypes", Path: "py.md"},
+			},
+		},
+	})
+
+	cmd := NewInit(reg)
+	cmd.SetArgs([]string{"--root", root, "--home", home, "--from", "stub", "--no-prompt"})
+	require.NoError(t, cmd.Execute())
+
+	assert.FileExists(t, filepath.Join(root, "rules", "go.md"))
+	assert.FileExists(t, filepath.Join(root, "rules", "py.md"))
+
+	// Round-trips back through the loader.
+	b, err := canonical.Load(root)
+	require.NoError(t, err)
+	require.Len(t, b.Rules, 2)
+}
+
 func makeStubReg() *adapter.Registry {
 	reg := adapter.NewRegistry()
 	reg.Register(&importableAdapter{

internal/gitx/repo.go

@@ -71,6 +71,17 @@ func (r *Repo) IsRepo() bool {
 	return err == nil
 }
 
+// HasStagedChanges reports whether the index currently differs from HEAD.
+// Used by callers that want to skip a no-op `git commit` (commit exits 1
+// when there is nothing to commit, which is the wrong signal to propagate).
+func (r *Repo) HasStagedChanges() (bool, error) {
+	b, err := r.run("status", "--porcelain")
+	if err != nil {
+		return false, err
+	}
+	return len(bytes.TrimSpace(b)) > 0, nil
+}
+
 // Revert undoes the last N commits with `git revert --no-edit HEAD~N..HEAD`.
 // n must be >= 1.
 func (r *Repo) Revert(n int) error {

internal/gitx/repo_test.go

@@ -41,3 +41,33 @@ func TestShowFileAtHead(t *testing.T) {
 	_, err = r.ShowFileAtHead("nope.txt")
 	assert.Error(t, err)
 }
+
+func TestHasStagedChangesEmptyAfterInit(t *testing.T) {
+	dir := t.TempDir()
+	r := New(dir)
+	require.NoError(t, r.Init())
+	require.NoError(t, r.Configure("nobody", "[email protected]"))
+	// No commits yet, working tree clean.
+	dirty, err := r.HasStagedChanges()
+	require.NoError(t, err)
+	assert.False(t, dirty)
+}
+
+func TestHasStagedChangesAfterAdd(t *testing.T) {
+	dir := t.TempDir()
+	r := New(dir)
+	require.NoError(t, r.Init())
+	require.NoError(t, r.Configure("nobody", "[email protected]"))
+	require.NoError(t, os.WriteFile(filepath.Join(dir, "a.txt"), []byte("x"), 0o600))
+	require.NoError(t, r.AddAll())
+
+	dirty, err := r.HasStagedChanges()
+	require.NoError(t, err)
+	assert.True(t, dirty)
+
+	// After commit, index matches HEAD again → no staged changes.
+	require.NoError(t, r.Commit("c"))
+	dirty, err = r.HasStagedChanges()
+	require.NoError(t, err)
+	assert.False(t, dirty)
+}

tests/e2e/e2e_test.go

@@ -17,11 +17,15 @@ func TestInitApplyDiffCycle(t *testing.T) {
 	home := t.TempDir()
 	root := filepath.Join(home, ".config", "harness-sync")
 
-	// Fake a claude-code install with one skill
+	// Fake a claude-code install with one skill and one rule
 	require.NoError(t, os.MkdirAll(filepath.Join(home, ".claude", "skills", "hi"), 0o750))
 	require.NoError(t, os.WriteFile(
 		filepath.Join(home, ".claude", "skills", "hi", "SKILL.md"),
 		[]byte("---\nname: hi\n---\nbody"), 0o600))
+	require.NoError(t, os.MkdirAll(filepath.Join(home, ".claude", "rules"), 0o750))
+	require.NoError(t, os.WriteFile(
+		filepath.Join(home, ".claude", "rules", "go.md"),
+		[]byte("# Go Rules\n\ngofmt always"), 0o600))
 
 	run := func(args ...string) ([]byte, error) {
 		cmd := exec.Command(bin, args...)
@@ -33,6 +37,7 @@ func TestInitApplyDiffCycle(t *testing.T) {
 	require.NoError(t, err, string(out))
 	assert.FileExists(t, filepath.Join(root, "config.yaml"))
 	assert.FileExists(t, filepath.Join(root, "skills", "hi", "SKILL.md"))
+	assert.FileExists(t, filepath.Join(root, "rules", "go.md"))
 
 	// apply may produce conflicts on a freshly imported tree (because the
 	// claude-code adapter merges into existing settings.json which differs