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8 clients · secrets stay placeholders

JSON (mcpServers)Claude CodeCodexOpenCodeCursorVS CodeGemini CLIGoose

{
  "mcpServers": {
    "carbon-fyi": {
      "type": "http",
      "url": "https://www.carbon.fyi/api/mcp"
    }
  }
}

claude mcp add --transport http carbon-fyi https://www.carbon.fyi/api/mcp

[mcp_servers.carbon-fyi]
url = "https://www.carbon.fyi/api/mcp"

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "carbon-fyi": {
      "type": "remote",
      "url": "https://www.carbon.fyi/api/mcp",
      "enabled": true
    }
  }
}

{
  "mcpServers": {
    "carbon-fyi": {
      "type": "http",
      "url": "https://www.carbon.fyi/api/mcp"
    }
  },
  "deeplink": "cursor://anysphere.cursor-deeplink/mcp/install?name=carbon-fyi&config=eyJ0eXBlIjoiaHR0cCIsInVybCI6Imh0dHBzOi8vd3d3LmNhcmJvbi5meWkvYXBpL21jcCJ9"
}

{
  "servers": {
    "carbon-fyi": {
      "type": "http",
      "url": "https://www.carbon.fyi/api/mcp"
    }
  }
}

{
  "mcpServers": {
    "carbon-fyi": {
      "httpUrl": "https://www.carbon.fyi/api/mcp"
    }
  }
}

extensions:
  "carbon-fyi":
    enabled: true
    name: "carbon-fyi"
    type: streamable_http
    uri: "https://www.carbon.fyi/api/mcp"
    timeout: 300

Quality 89 / 100good

protocol88 · weight 25

pass
protocol.modernsupports 2026-07-28 (server/discover)
pass
protocol.statelessanswers without a session
pass
protocol.transportstreamable HTTP
warn
protocol.list_ttltools/list declares ttlMs 0, so clients re-fetch it on every use

authorizationn/a · weight 15

n/a
auth.prm, auth.as_metadata, auth.cimdno remote uses OAuth
n/a
auth.secret_in_urlno templated URL

tool hygiene86 · weight 30

pass
tools.descriptionsevery tool has a description
pass
tools.description_lengthdescriptions are concise
pass
tools.schemasevery tool has an object input schema
pass
tools.annotations6 of 6 tools declare readOnlyHint or destructiveHint
fail
tools.directory_hintsno tool declares all four of readOnlyHint, destructiveHint, idempotentHint and openWorldHint; missing: get_story (destructiveHint, idempotentHint); search_news (destructiveHint, idempotentHint); get_carbon_prices (destructiveHint, idempotentHint); …
pass
tools.token_costabout 916 tokens to load every tool
pass
tools.api_dumptools are not a one-to-one API dump

stability100 · weight 15

pass
stability.changesno tool changes in 30 days
pass
stability.rug_pullno tool changed its meaning under the same name

dependenciesn/a · weight 15

n/a
deps.known_vulns, deps.mcp_sdk_version, deps.resolvableno npm or PyPI package

6 tools, about 916 tokens to load them all · tool set 643b847b613a · checked 2026-10-21 01:38 UTC

Tool changes

No tool definition changes recorded. A server's first observation is its baseline; later probes record what changes.

Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed. How it is computed.

Trust 93 / 100

provenance85

liveness100

freshness85

hygiene100

+repository +dns-namespace +website +reachable +uptime-100% ~updated-54d-ago

Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed. How it is computed.

Endpoints

remote	auth	reachable	uptime 30d	p50	protocol	last ok
`https://www.carbon.fyi/api/mcp` streamable-http	none	yes	100%	302 ms	2026-07-28	2026-10-20

Tools (6)

`get_carbon_prices`read-only	Current voluntary carbon credit prices from two independent sources: per-category minimum/median price and available supply across the Carbonmark marketplace catalog, and spot prices per Klima Protocol carbon class. The two are NOT comparable — read the `caveats` field on each before using either number.
`get_market_summary`read-only	One call for orientation: how much of the archive is available, when it last updated, the story-tag breakdown (use these as `tag` values for search_news), and the current price table. Start here.
`get_price_history`read-only	Daily-averaged historical price series. This archive exists only because carbon.fyi records it three times a day: no upstream API serves a historical carbon price series, so these observations cannot be obtained anywhere else and cannot be re-derived. Check `seriesStartsAt` in the response — the archive began on 2026-08-27, so early windows are necessarily short.
`get_story`read-only	Fetch a single story by its id, including every source that reported it. Story ids are permanent — a published story keeps its id and its public URL indefinitely — so they are safe to store.
`list_sources`read-only	The publications, registries and integrity bodies carbon.fyi monitors. Useful for judging coverage — a topic absent from the archive may simply not be covered by these sources.
`search_news`read-only	Search carbon.fyi's curated voluntary carbon market story archive. Each story is an editorially clustered summary of one development, written from one or more original reports, and always carries the original source name and URL. Supply at least one filter; results are newest-first. Use `get_market_summary` first if you do not know what tags or date range to ask for.

Schemas: list_tools.

Similar MCP servers

Official server.json

{
  "name": "fyi.carbon/carbon-fyi",
  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
  "remotes": [
    {
      "url": "https://www.carbon.fyi/api/mcp",
      "type": "streamable-http"
    }
  ],
  "version": "0.1.0",
  "repository": {
    "url": "https://github.com/Carbonmark/carbon.fyi-new",
    "source": "github"
  },
  "websiteUrl": "https://www.carbon.fyi/mcp",
  "description": "Voluntary carbon market news and open carbon price data. Read-only, keyless."
}