Hybrid Code Search (Beacon)
This repo has a Beacon hybrid search index combining semantic embeddings, BM25 keyword matching, and identifier boosting. Beacon is enforced as the default search — grep is automatically intercepted and redirected to Beacon for queries it handles better.
How to search
node ${CLAUDE_PLUGIN_ROOT}/scripts/search.js "<query>"Options
--top-k N— number of results (default: 10)--threshold F— minimum score cutoff (default: 0.35)--no-hybrid— disable hybrid, use pure vector search only
Multi-query batch
node ${CLAUDE_PLUGIN_ROOT}/scripts/search.js "auth flow" "session handling" "token refresh"Single HTTP round-trip for all queries. Returns grouped results.
Output
JSON array of matches, each with:
file— file pathlines— line range (e.g. "45-78")similarity— vector cosine similarityscore— final hybrid score (when hybrid enabled)preview— first 300 chars of matched chunk
Grep intercept behavior
Grep is denied and redirected to Beacon unless one of these conditions is met:
| Grep passes through when... | Example | |---|---| | Pattern has regex metacharacters | function\s+\w+ | | Targets a specific file | path: "src/lib/db.js" | | output_mode is "count" | Counting occurrences | | Pattern is <= 3 characters | fs, db | | Dotted identifier | fs.readFileSync, path.join | | Path-like pattern (contains / or \) | src/components | | output_mode is "content" | Viewing matching lines | | Quoted string literal | "use strict", 'Content-Type' | | Annotation/marker pattern | TODO, FIXME, @param, #pragma | | URL-like pattern | http://, localhost:3000 | | Beacon index is unhealthy | DB missing, empty, dimension mismatch | | Intercept disabled via config | intercept.enabled: false |
To disable interception entirely, set intercept.enabled: false in .claude/beacon.json.
Workflow
- Search with Beacon → get candidate files + line ranges with scores
- Read top 2-3 files at the indicated line ranges for full context
- If needed, grep within those files for specifics (imports, call sites)
- Answer the user with file:line citations