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possible055

Relace MCP Server

by possible055

Server Configuration

Describes the environment variables required to run the server.

NameRequiredDescriptionDefault
RELACE_API_KEYYesAPI key from Relace Dashboard (https://app.relace.ai/settings/billing)
RELACE_LOGGINGNoEnable file logging (set to 1 to enable)0
RELACE_BASE_DIRNoAbsolute path to project root (auto-detected via MCP Roots or Git if not set)
RELACE_TIMEOUT_SECONDSNoTimeout for API requests in seconds
RELACE_DEFAULT_ENCODINGNoForce file encoding (e.g., gbk, big5) for legacy repos
RELACE_ENCODING_SAMPLE_LIMITNoMax files for auto-detecting encoding30

Capabilities

Features and capabilities supported by this server

CapabilityDetails
tools
{
  "listChanged": true
}
logging
{}
prompts
{
  "listChanged": false
}
resources
{
  "subscribe": false,
  "listChanged": false
}
extensions
{
  "io.modelcontextprotocol/ui": {}
}
experimental
{}

Tools

Functions exposed to the LLM to take actions

NameDescription
fast_applyA

Edit or create a file using intelligent merging.

For new files: writes content directly. For existing files: merges edit_snippet with current content using anchor lines. Anchor lines are verbatim lines copied from the existing file that help locate the exact edit target. Include 1-2 unique lines adjacent to the change. Truncation markers are recommended for larger scoped edits but not required. Markdown files keep fenced code blocks verbatim; outer fence stripping is skipped for .md/.mdx targets.

On error, the response includes a code field:

  • NEEDS_MORE_CONTEXT: merge model could not locate the target - add 1-2 unique anchor lines from immediately around the edit location.

  • APPLY_NOOP: merge returned an identical file even though the snippet contained explicit remove directives or concrete new lines not present in the original.

  • BLAST_RADIUS_EXCEEDED: edit scope too large - split into smaller edits.

  • MARKER_LEAKAGE: placeholder marker text leaked into merged output (treated as literal text).

  • TRUNCATION_DETECTED: merged output shrank drastically and no explicit remove directive was provided.

On success: {status: "ok", diff: str | None (unified diff, None for new files or no-op)}.

Do NOT use this tool to delete files or clear file contents. Use a dedicated file management tool for those operations.

agentic_searchA

Search codebase for code locations matching a query.

Use when you know the name or structure you're looking for — function names, class names, modules, or how components connect. For conceptual/behavioral queries without known identifiers, use agentic_retrieval instead.

Returns file paths with line ranges and an explanation of findings. Keys: explanation (str), files (dict[path → {lines, snippet}]), turns_used (int).

index_statusA

Inspect the single active indexing backend in read-only mode.

Use this before retrieval when you need to know whether the active backend is fresh and whether semantic hints are usable. Returns active_backend, a single backend status object with freshness and hints_usable, and background_monitor (state, reason). This tool never refreshes indexes; if active_backend is relace and backend.status.needs_sync is true, run cloud_sync().

cloud_syncA

Upload or refresh codebase to Relace Cloud for semantic search.

Check index_status() first—skip this if cloud freshness is already 'fresh'. Syncs git-tracked files to enable cloud_search. Incremental by default.

Advanced (Relace-specific): force=True Re-upload all files; use after large refactors. force=True+mirror=True Delete cloud files absent locally; use after branch switch.

Returns: {sync_mode (str), files_created (int), files_updated (int), files_deleted (int), files_unchanged (int), warnings (list[str]), repo_id (str), repo_head (str)}. Check warnings[] for truncation or suppressed deletes. Fails if not in a git repo or RELACE_API_KEY is not set.

cloud_searchA

Search for code by meaning using AI embeddings. Requires cloud_sync first.

Use for conceptual queries where you don't know the exact file, class, or function name. Prefer agentic_search when you know the exact identifier or symbol name.

Prerequisite: cloud_sync must have been run at least once. Fails if RELACE_API_KEY is not set or no sync state exists.

Returns: {results (list), result_count (int), warnings (list[str]), query (str), branch (str), repo_id (str)}. Check warnings[] for stale index alerts (e.g., uncommitted local changes).

cloud_clearA

Delete cloud repository and local sync state. IRREVERSIBLE.

Removes all indexed data from Relace Cloud. Use cloud_list to find repo IDs.

cloud_listA

[ADMIN] List all repositories in your Relace Cloud account.

Use to find repo_id for cloud_clear. Not needed for normal search/sync workflow. Returns repository IDs, names, and indexing status.

Prompts

Interactive templates invoked by user choice

NameDescription

No prompts

Resources

Contextual data attached and managed by the client

NameDescription
cloud_statusCurrent cloud sync status — lightweight, reads local state file only (no API calls). For dashboard/UI display. Agents should use the index_status tool instead, which covers Relace, Codanna, and ChunkHound backends with recommended_action.

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