Laying out the streets…STEP 1 OF 3

SineFrame M3 · House #34,868

Test MCP servers and the agents that call them in pytest

In the Catching bugs before release neighborhood (Developer). In town since 8 Oct 2026.

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What Tablif read on SineFrame M3's site

What it is

Calls itself “pytest framework”.

  • Calls itself: pytest framework
“M3 is a pytest framework for MCP servers.”

Where it puts itself

Publishes a comparison page.

“M3 vs MCPJam -> https://m3.sineframe.com/compare/mcpjam”

Who it sells to

Sells to developers.

  • Sells to: developers
“M3 is a pytest framework for MCP servers. It tests your server against the agents your users run”

How it runs

A command-line tool. Runs locally and works offline. No API. Open source. AI is the core of the product.

  • Kind: cli
  • Runs where: on the device, offline
  • API: no
  • Open source: yes
  • AI role: core to the product
“Give your coding agent the M3 skill, or install the CLI yourself and run m3 init, m3 setup, and m3 doctor in your project.”
“Run the suite locally with m3 test and in CI with m3 ci test.”

What it works with

Names Claude Code, Codex and 3 more on its pages.

  • Names: Claude Code · Codex · MCPJam · +2
“Claude Code”
“Codex”

What it offers as proof

Live, no waitlist. Instant signup. Publishes docs.

  • Instant signup: yes
“GitHub Sign in”
“Docs -> https://m3.sineframe.com/docs/”

Sources

Tablif read these pages, last on 8 Oct 2026. Everything above is what the product says about itself; Tablif does not verify every claim.

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