fix(mcp): filterByFilepaths now accepts regular expressions (#1008)

* fix(mcp): clarify filterByFilepaths accepts regular expressions

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* chore: update mcp CHANGELOG for #1008

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* chore: update CHANGELOG to reflect behavior change in filterByFilepaths

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* chore: move CHANGELOG entry to main changelog

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* update claude.md

* fix(web): filterByFilepaths in chat tool now accepts regular expressions

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: brendan-kellam

CHANGELOG.md

@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed
+- `filterByFilepaths` in the MCP `search_code` tool now accepts regular expressions matched against the full file path, instead of treating values as escaped literals. [#1008](https://github.com/sourcebot-dev/sourcebot/pull/1008)
+
 ## [4.15.7] - 2026-03-16
 
 ### Added

CLAUDE.md

@@ -247,6 +247,5 @@ PR description:
 
 After the PR is created:
 - Update CHANGELOG.md with an entry under `[Unreleased]` linking to the new PR. New entries should be placed at the bottom of their section.
-- If the change touches `packages/mcp`, update `packages/mcp/CHANGELOG.md` instead
 - Do NOT add a CHANGELOG entry for documentation-only changes (e.g., changes only in `docs/`)
 - Enterprise-only features (gated by an entitlement) should be prefixed with `[EE]` in the CHANGELOG entry (e.g., `- [EE] Added support for ...`)

packages/web/src/features/chat/tools.ts

@@ -166,7 +166,7 @@ export const createCodeSearchTool = (selectedRepos: string[]) => tool({
             .optional(),
         filterByFilepaths: z
             .array(z.string())
-            .describe(`Scope the search to the provided filepaths.`)
+            .describe(`Scope the search to the provided filepaths. Each filepath is a regular expression matched against the full file path.`)
             .optional(),
         caseSensitive: z
             .boolean()
@@ -206,7 +206,7 @@ export const createCodeSearchTool = (selectedRepos: string[]) => tool({
         }
 
         if (filepaths.length > 0) {
-            query += ` (file:${filepaths.map(filepath => escapeStringRegexp(filepath)).join(' or file:')})`;
+            query += ` (file:${filepaths.join(' or file:')})`;
         }
 
         if (ref) {

packages/web/src/features/mcp/server.ts

@@ -98,7 +98,7 @@ export function createMcpServer(): McpServer {
                     .optional(),
                 filterByFilepaths: z
                     .array(z.string())
-                    .describe(`Scope the search to the provided filepaths.`)
+                    .describe(`Scope the search to the provided filepaths. Each filepath is a regular expression matched against the full file path.`)
                     .optional(),
                 caseSensitive: z
                     .boolean()
@@ -147,7 +147,7 @@ export function createMcpServer(): McpServer {
                 query += ` (lang:${languages.join(' or lang:')})`;
             }
             if (filepaths.length > 0) {
-                query += ` (file:${filepaths.map(fp => escapeStringRegexp(fp)).join(' or file:')})`;
+                query += ` (file:${filepaths.join(' or file:')})`;
             }
             if (ref) {
                 query += ` ( rev:${ref} )`;