Mycelium Emissions Database

A hosted Model Context Protocol server that gives AI assistants direct access to the Mycelium open corporate carbon emissions database: company search, Mycelium Scores, and full per-scope greenhouse gas figures.

• Endpoint (streamable HTTP): https://mycelium.global/mcp/server
• Auth: none - anonymous access with a per-IP rate limit, so a pasted URL works in any MCP client
• Info page: https://mycelium.global/mcp
• REST API + OpenAPI spec: https://github.com/MyceliumNetwork/api
• Website: https://mycelium.global

Setup

Claude (claude.ai, Claude Desktop)

Settings → Connectors → Add custom connector → paste https://mycelium.global/mcp/server.

Claude Code

claude mcp add --transport http mycelium https://mycelium.global/mcp/server

Cursor / generic MCP client

{
  "mcpServers": {
    "mycelium": {
      "url": "https://mycelium.global/mcp/server"
    }
  }
}

Tools

search-entities

Search the emissions database for companies by name. Returns matching companies with their Mycelium Score and the slug handle used by the other tools.

Input	Type	Description
query	string (required)	Company name or name fragment
country	string	Optional ISO 3166-1 alpha-3 filter, e.g. GBR, DEU
limit	integer	Max matches to return, 1-25, default 10

get-entity-profile

A company's public Mycelium profile: identity and registration, Mycelium Score (0 to 10) with industry rank, Transparency Score, and a per-year summary of total emissions in tonnes CO2e split into reported and estimated.

Input	Type	Description
entity	string (required)	Slug from search-entities, or Mycelium public id GUID

get-emission-figures

Full greenhouse gas figures for one reporting year in the OpenCCF data model: per-scope lines (Scope 1, 2 and 3 with categories) in kgCO2e, each tagged as reported by the company or estimated by Mycelium.

Input	Type	Description
entity	string (required)	Slug from search-entities, or Mycelium public id GUID
year	integer	Reporting year, e.g. 2023. Defaults to the latest on file

Provenance

Every emissions line is tagged as reported by the company or estimated by Mycelium. Clients should preserve that distinction and never present an estimate as a company's own disclosure.

About the data

Mycelium is an open corporate carbon disclosure platform covering hundreds of thousands of entities, built from company reporting, registry data (GLEIF, Companies House and others) and modelled estimates. The same data is available over REST: see the Mycelium Network API.

License

Documentation in this repository is MIT licensed (see LICENSE). Use of the hosted service is governed by the terms at https://mycelium.global.