EVC Mesh MCP Server

Model Context Protocol (MCP) server for EVC Mesh — a task management platform for coordinating humans and AI agents.

Connects AI agents (Claude Code, Cursor, Cline, OpenClaw, etc.) to EVC Mesh via MCP tools for task management, persistent memory, event publishing, and multi-agent coordination.

This is the actively developed copy. evc-mesh also ships an MCP server (./cmd/mcp, same internal/mcp tool set) that it builds and deploys itself — the two exist because Go's internal/ visibility rules mean one repo can't import the other's package, not because they're meant to diverge. New tools and fixes land here first.

Prerequisites

• Go 1.22+
• Running EVC Mesh instance
• Agent registered in Mesh with an API key (agk_...)

Installation

go install github.com/entire-vc/evc-mesh-mcp@latest

Or build from source:

git clone https://github.com/entire-vc/evc-mesh-mcp.git
cd evc-mesh-mcp
go build -o evc-mesh-mcp .

Docker

docker run -i --rm \
  -e MESH_API_URL \
  -e MESH_AGENT_KEY \
  ghcr.io/entire-vc/evc-mesh-mcp

-i is required — the server speaks MCP over stdio, and Docker only wires up stdin when the container runs interactively. Add -e MESH_MCP_PROFILE=core to switch profiles (see Tool Profiles below). The image is published for linux/amd64 and linux/arm64 from Dockerfile in this repo on every tagged release (docs/RELEASING.md).

Tool Profiles

The MCP server supports two profiles to optimize context window usage:

Set via MESH_MCP_PROFILE environment variable. Default: full.

Configuration

Running without credentials

In stdio mode the server also starts when MESH_AGENT_KEY is not set. It then answers initialize and tools/list as usual, and every tool call returns instructions for setting MESH_API_URL and MESH_AGENT_KEY. This lets MCP clients and catalogs inspect the tool list before you have a key. If a key is set but authentication fails at startup (API unreachable, key rejected), the server keeps running: tools are listed, and each call retries authentication and returns the reason until it succeeds.

Tool annotations

Every tool declares the MCP hints readOnlyHint, destructiveHint, idempotentHint and openWorldHint, so clients can tell read-only tools (get_*, list_*, recall, search_docs, …) from ones that change or remove data (update_*, move_task, forget, …).

Client metrics

Each initialize is logged with the client's clientInfo.name and version, and counted in the Prometheus metric mesh_mcp_initialize_total{client,profile} (exposed on /metrics in SSE mode; client names are normalised and capped).

Claude Code (stdio mode)

Add to your project's .mcp.json:

{
  "mcpServers": {
    "evc-mesh": {
      "command": "evc-mesh-mcp",
      "env": {
        "MESH_API_URL": "https://your-mesh-instance.example.com",
        "MESH_AGENT_KEY": "agk_your-workspace_your-key",
        "MESH_MCP_PROFILE": "core"
      }
    }
  }
}

Cursor

Add to Cursor MCP settings (Settings → MCP Servers):

{
  "evc-mesh": {
    "command": "evc-mesh-mcp",
    "env": {
      "MESH_API_URL": "https://your-mesh-instance.example.com",
      "MESH_AGENT_KEY": "agk_your-workspace_your-key",
      "MESH_MCP_PROFILE": "core"
    }
  }
}

SSE Mode (multi-agent, shared server)

For connecting multiple agents through a shared MCP endpoint:

MESH_API_URL=https://your-mesh-instance.example.com \
MESH_MCP_PORT=8081 \
evc-mesh-mcp --transport sse

SSE mode serves two profiles simultaneously on different paths:

The same process also serves the Streamable HTTP transport (stateless, one agent key per request, sent in the Authorization: Bearer or X-Agent-Key header — the query parameter is refused there):

Authentication per connection via:

• Authorization: Bearer agk_... header
• X-Agent-Key: agk_... header
• ?agent_key=agk_... query parameter (SSE connect only)
• Authorization: Bearer mot_... — an OAuth access token issued by your Mesh instance (see below); the header only, never the query string, and on the Streamable HTTP endpoints only (SSE connections need an agent key)

OAuth (remote connectors)

Clients that sign users in with OAuth — remote-connector directories, MCP Inspector, editors that follow the MCP authorization spec — connect to the Streamable HTTP endpoints without a pre-shared key. Your Mesh instance is the authorization server (dynamic client registration, PKCE, user consent); this server is the resource server and does two things:

• Challenges. A request with no credential, or with an OAuth access token Mesh API rejects (expired, revoked, never issued), gets 401 and

  Code

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  WWW-Authenticate: Bearer resource_metadata="https://mesh.example.com/.well-known/oauth-protected-resource/mcp", scope="mesh"
  

  which is where a client starts the authorization flow. A rejected agent key keeps answering 403. Only a verdict from Mesh API (a 4xx other than 408/429) makes a token invalid: if Mesh API cannot be reached or answers with an error that says nothing about the token (5xx, 429), the answer is 503 with Retry-After, so a valid token is not thrown away over an outage.

• Serves the metadata (RFC 9728) at the well-known path derived from each endpoint's URL:

  Endpoint	Metadata
  https://mesh.example.com/mcp (full)	/.well-known/oauth-protected-resource/mcp
  https://mesh.example.com/mcp/core (core)	/.well-known/oauth-protected-resource/mcp/core

  config.json

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  {
    "resource": "https://mesh.example.com/mcp",
    "authorization_servers": ["https://mesh.example.com"],
    "scopes_supported": ["mesh"],
    "bearer_methods_supported": ["header"]
  }
  

  resource is MESH_MCP_PUBLIC_URL (trailing slash, query and fragment removed; /core appended for the core profile), so set it to the URL your users paste into the client. The authorization server defaults to that URL's origin; override it with MESH_MCP_OAUTH_ISSUER.