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fix(mcp): declare readOnlyHint on find_files/grep/multi_grep (#771) #774

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Merged
dmtrKovalenko merged 1 commit into from
Aug 13, 2026
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fix(mcp): declare readOnlyHint on find_files/grep/multi_grep (#771) #774

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21 changes: 18 additions & 3 deletions crates/fff-mcp/src/server.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -421,7 +421,12 @@ impl FffServer {
/// IMPORTANT: Keep queries SHORT — prefer 1-2 terms max.
#[tool(
name = "find_files",
description = "Fuzzy file search by name. Searches FILE NAMES, not file contents. Use it when you need to find a file, not a definition. Use grep instead for searching code content (definitions, usage patterns). Supports fuzzy matching, path prefixes ('src/'), and glob constraints ('name **/src/*.{ts,tsx} !test/'). IMPORTANT: Keep queries SHORT — prefer 1-2 terms max. Multiple words are a waterfall (each narrows results), NOT OR. If unsure, start broad with 1 term and refine."
description = "Fuzzy file search by name. Searches FILE NAMES, not file contents. Use it when you need to find a file, not a definition. Use grep instead for searching code content (definitions, usage patterns). Supports fuzzy matching, path prefixes ('src/'), and glob constraints ('name **/src/*.{ts,tsx} !test/'). IMPORTANT: Keep queries SHORT — prefer 1-2 terms max. Multiple words are a waterfall (each narrows results), NOT OR. If unsure, start broad with 1 term and refine.",
annotations(
read_only_hint = true,
destructive_hint = false,
open_world_hint = false
)
)]
fn find_files(
&self,
Expand Down Expand Up @@ -536,7 +541,12 @@ impl FffServer {
/// Prefer plain text over regex. Filter files with constraints.
#[tool(
name = "grep",
description = "Search file contents. Search for bare identifiers (e.g. 'InProgressQuote', 'ActorAuth'), NOT code syntax or regex. Filter files with constraints (e.g. '*.rs query', 'src/ query'). Use filename, directory (ending with /) or glob expressions to prefilter. See server instructions for constraint syntax and core rules."
description = "Search file contents. Search for bare identifiers (e.g. 'InProgressQuote', 'ActorAuth'), NOT code syntax or regex. Filter files with constraints (e.g. '*.rs query', 'src/ query'). Use filename, directory (ending with /) or glob expressions to prefilter. See server instructions for constraint syntax and core rules.",
annotations(
read_only_hint = true,
destructive_hint = false,
open_world_hint = false
)
)]
fn grep(
&self,
Expand Down Expand Up @@ -573,7 +583,12 @@ impl FffServer {
/// Patterns are literal text — NEVER escape special characters.
#[tool(
name = "multi_grep",
description = "Search file contents for lines matching ANY of multiple patterns (OR logic). IMPORTANT: This returns files where ANY query matches, NOT all patterns. Patterns are literal text — NEVER escape special characters (no \\( \\) \\. etc). Faster than regex alternation for literal text. See server instructions for constraint syntax."
description = "Search file contents for lines matching ANY of multiple patterns (OR logic). IMPORTANT: This returns files where ANY query matches, NOT all patterns. Patterns are literal text — NEVER escape special characters (no \\( \\) \\. etc). Faster than regex alternation for literal text. See server instructions for constraint syntax.",
annotations(
read_only_hint = true,
destructive_hint = false,
open_world_hint = false
)
)]
fn multi_grep(
&self,
Expand Down
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