Local Corpus Context Source

Source of truth: src/lib/localCorpus/index.ts (bounded text index), src/lib/localCorpus/configured.ts (configured runtime), src/lib/db/localCorpus.ts (root-path persistence), open-sse/mcp-server/tools/localCorpusTools.ts (3 read-only MCP tools), and src/app/api/settings/local-corpus/route.ts (settings API).

What it is

Local Corpus lets an operator expose one explicitly approved directory of text files to OmniRoute’s MCP server. Files stay in their original directory: OmniRoute stores only the canonical root path in SQLite and maintains an in-memory search index. It does not copy corpus content into the repository or database.

The index refresh is incremental. Unchanged files are reused based on size and modified time, changed files are reread and hashed with SHA-256, and deleted files are removed. Search refreshes an index older than 30 seconds; callers can also request an immediate refresh.

Configure the source

The settings route requires the same management authentication as other settings APIs. The submitted path must already exist and must be an absolute directory path.

# Connect an approved directory
curl -X POST http://localhost:20128/api/settings/local-corpus \
  -H "Content-Type: application/json" \
  -d '{"rootPath":"/absolute/path/to/approved-text"}'

# Check configuration and index status
curl http://localhost:20128/api/settings/local-corpus

# Disconnect without changing source files
curl -X DELETE http://localhost:20128/api/settings/local-corpus

MCP tools

All three tools require read:local-corpus. Tool responses expose relative paths and the root directory’s basename, never its absolute path.

Tool	Description
local_corpus_status	Report configuration state, index size, limits, and the last refresh time
local_corpus_search	Search indexed text and return bounded, line-scoped snippets (up to 20 results)
local_corpus_read	Read a bounded line range from one permitted corpus-relative file

Example MCP inputs:

{ "query": "Red River monitoring", "limit": 10, "refresh": false }

{ "relativePath": "hydrology/stations.md", "startLine": 20, "endLine": 80 }

Safety boundaries

• The allowlist is text-oriented: .cfg, .csv, .geojson, .htm, .html, .ini, .js, .json, .jsonl, .jsx, .log, .md, .mjs, .ps1, .py, .sh, .sql, .toml, .ts, .tsx, .txt, .xml, .yaml, and .yml.
• Symlinks are skipped. Read paths are canonicalized and must remain inside the configured root; absolute paths and traversal attempts are rejected.
• Sensitive and generated directory names are excluded: .build, .codex, .env, .git, .next, .omniroute, .ssh, coverage, dist, node_modules, and secrets.
• Default limits are 5,000 files, 1 MiB per file, 64 MiB total indexed content, approximately 4,000 characters per search chunk, and 400 lines per read.
• NUL-containing files are treated as non-text and skipped or rejected.

Binary documents such as PDF, DOCX, images, and archives are intentionally unsupported. Convert them to an approved text format in the configured directory before indexing.

Operational notes

• Changing or deleting the configured root clears the shared in-memory index.
• A process restart discards the index; the next search rebuilds it from the configured source.
• local_corpus_status does not force a scan. Use local_corpus_search with refresh: true when an immediate rescan is required.
• Scan and read failures are counted or returned as sanitized errors; source files are never modified.

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