fix(mcp): filterByFilepaths now accepts regular expressions

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/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} )`;