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perf(file_read): compact line-number prefix by default

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The default line prefix was the padded '  42| ' form; the compact '42|' form
existed only as opt-in (compact_line_numbers). The padding and trailing space
carry no information an LLM needs, costing ~3 chars/line — ~300 tokens on a
400-line read, the highest-volume path in the server. Flip the default to
compact; compact_line_numbers=false, mode/line_numbers=full, and the session
'full' pref all still restore the padded alignment (explicit override wins).

Updates the two tests that pinned the old default and refreshes stale comments.
This commit is contained in:
lukaszraczylo
2026-06-21 02:15:49 +01:00
parent d0c07f0157
commit 664b7dac45
4 changed files with 23 additions and 15 deletions
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internal/server/handlers_file.go
+7 -3
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@@ -326,9 +326,13 @@ type lineNumberOpts struct {
// resolveLineNumberOpts resolves per-call vs session-pref line-number options.
func (s *Server) resolveLineNumberOpts(request mcp.CallToolRequest) lineNumberOpts {
opts := lineNumberOpts{
noLineNumbers: request.GetBool("no_line_numbers", false),
lineInterval: request.GetInt("line_number_interval", 1),
compactLineNums: request.GetBool("compact_line_numbers", false),
noLineNumbers: request.GetBool("no_line_numbers", false),
lineInterval: request.GetInt("line_number_interval", 1),
// Compact prefix ("12│content") is the default — it drops the 4-wide
// padding and trailing space of the legacy " 12│ " form, saving ~3
// chars/line with no information loss. Pass compact_line_numbers=false
// (or mode/line_numbers="full") to restore the padded alignment.
compactLineNums: request.GetBool("compact_line_numbers", true),
}
// Apply session line_numbers pref when no explicit per-call override was supplied.