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MCP Server Changelog

Versions of the MIND MCP server. The running version is serverInfo.version in the initialize result (or _meta["io.modelcontextprotocol/serverInfo"] from server/discover) and version in the server card. Changes to the setup of a particular client are on MCP Server, not here.

2.0.0

October 2026

A rebuild on the official MCP SDK, answering from an index of the published sources with a citation on every passage.

  • New tools: search, fetch, list_docs, lookup_symbol and explain_error, each with an output schema and read-only annotations.
  • Resources: the language reference, the docs index, mind://about and every docs page, plus six resource templates (docs, std modules, error codes, examples, release notes, specification chapters) with argument completion.
  • Prompts: write_mind_code, explain_mind_error and port_to_mind.
  • Search over the whole index, with a mode field on every result. Search matches by meaning and by keyword (mode: "hybrid"), and falls back to keywords alone (mode: "lexical") instead of failing when the embedding model is unavailable or one client sends more than 30 searches a minute.
  • Endpoint: Streamable HTTP at https://mcp.mindlang.dev/mcp, stateless. The bare https://mcp.mindlang.dev still accepts MCP requests, so 1.x setups keep working.
  • Protocol: revisions 2024-11-05 to 2025-11-25 through initialize, and 2026-07-28 with server/discover and one-hour cache hints.
  • Server card at /.well-known/mcp/server-card.json and /mcp/server-card, and GET /health with the server version and the newest protocol revision. Both also come in a MIND-native mic@3 form.
  • Root URL: GET / redirects to MCP Server; POST / still serves MCP.
  • /sse and /mcp/sse answer 404 with a message that points to /mcp, where 1.x answered a GET there with 405. Neither version served the older HTTP+SSE transport.
  • Kept: the 1.x tool names, which now answer from the same index, with citations, instead of fixed summaries.
  • Limits: 600 requests per minute per IP address, a 64 KiB body cap and 16-message batches, with documented error codes; counts-only telemetry.

1.0.0

July 2026

The first public server, at https://mcp.mindlang.dev.

  • Four read-only tools: mind_overview, mind_determinism_facts, mind_ecosystem and mind_lookup, answering from summaries of the public MIND documentation.
  • A per-IP rate limit and a request size cap.

Earlier names

The 1.x tool names (mind_overview, mind_determinism_facts, mind_ecosystem and mind_lookup) still answer, and POST to the bare https://mcp.mindlang.dev still serves MCP, so 1.x setups keep working. Older mindlang:// resource URIs still work and read the matching mind:// resource. New setups should use https://mcp.mindlang.dev/mcp and the current tools.

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