head to head · open source
fastapi_mcp vs agent-router
fastapi_mcp has 12,007 GitHub stars, 969 forks, 169 open issues and last shipped 10 months ago. agent-router has 2,121 stars, 382 forks, 300 open issues and last shipped today. fastapi_mcp leads on adoption by 466% (12,007 vs 2,121 stars). fastapi_mcp is written in Python under MIT; agent-router is written in Go under Apache-2.0. fastapi_mcp has attracted 8% as many forks as stars, agent-router 18%. agent-router was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (ai, llm), so they are genuine substitutes rather than adjacent tools.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| fastapi_mcp | agent-router | |
|---|---|---|
| GitHub stars | ★ 12K | ★ 2.1K |
| License | MIT | Apache-2.0 |
| Written in | Python | Go |
| Last push | 2025-11-24 | 2026-09-20 |
| Forks | ⑂ 969 | ⑂ 382 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick fastapi_mcp if
- You weight community size — 12K stars and counting
- You want the MIT license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick agent-router if
- You want the agent-router feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Go
- You evaluated both and agent-router fits your workflow better
About fastapi_mcp
FastAPI MCP is an MIT licensed Python library from Tadata that exposes the endpoints of an existing FastAPI application as Model Context Protocol (MCP) tools, so MCP clients such as Claude and Cursor can call a team's own API, and it is built for Python backend developers who already run FastAPI services and want agent access without hand writing a separate MCP server.
read the full fastapi_mcp overview →
About agent-router
Agent Router is an open source control plane for AI and agent traffic, built on Envoy and Envoy Gateway, that gives application teams one consistent OpenAI compatible API across hosted providers, self hosted inference, and MCP servers, and it is aimed at platform teams and application teams running generative AI workloads, especially on Kubernetes.
read the full agent-router overview →
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Frequently asked questions
Is fastapi_mcp or agent-router more popular?
fastapi_mcp has 12,007 GitHub stars and agent-router has 2,121. fastapi_mcp has the larger community by that measure.
Are fastapi_mcp and agent-router free?
Both are open source. fastapi_mcp is licensed under MIT and agent-router under Apache-2.0. Neither carries a licence fee.
What is the difference between fastapi_mcp and agent-router?
fastapi_mcp is written in Python and agent-router in Go. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, fastapi_mcp or agent-router?
Choose fastapi_mcp if you want the larger community (12,007 stars) or its MIT licence terms. Choose agent-router if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.