Carbon Arc MCP Server

Endpoint: https://mcp.carbonarc.ai (Streamable HTTP) Auth: OAuth 2.

Teams that want a hosted endpoint instead of running a local process.

VERIFIED ACTIVE

LAST COMMIT 2026-06-07 · ★ 33 · #676 OF 848 MAINTAINED OTHER · VERIFIED 2026-08-25

Apache-2.0 · how we verify → /methodology

01 · Install Carbon Arc

Claude Code

claude mcp add carbon-arc-mcp --transport http https://mcp.carbonarc.ai

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "carbon-arc-mcp": {
      "url": "https://mcp.carbonarc.ai"
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

https://mcp.carbonarc.ai

transport: streamable-http

endpoint alive - authentication required · probed 2026-08-25

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as remote - your agent's requests go to mcp.carbonarc.ai

endpoint auth requires authentication - rejected our unauthenticated MCP initialize

license Apache-2.0 - declared in the repository

registry namespace io.github.Carbon-Arc is GitHub-verified and matches the repo owner

03 · Who maintains Carbon Arc

Carbon Arc is maintained by carbon-arc. It's the only MCP server we track from this author; the repo dates to May 2026.

04 · Facts

repository
github.com/carbon-arc/mcp
category
other - ranked #676 of 848 actively-maintained other servers as of 2026-08-25.
registry
io.github.Carbon-Arc/mcp (active, first published 2026-06-07)

05 · Carbon Arc FAQ

What is Carbon Arc?

Endpoint: https://mcp.carbonarc.ai (Streamable HTTP) Auth: OAuth 2.

Is Carbon Arc still maintained?

Yes - as of 2026-08-25, its last commit was 2026-06-07. We re-verify nightly.

How do I install Carbon Arc?

Run `claude mcp add carbon-arc-mcp --transport http https://mcp.carbonarc.ai`. You can also paste the ready-made client config above.

Does Carbon Arc require authentication?

Yes - when we probed the endpoint on 2026-08-25, it rejected an unauthenticated MCP initialize; you'll need credentials to connect.

06 · Alternatives to Carbon Arc

Alternatives to Carbon Arc

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