How does SineFrame M3 differ from MCP server unit tests?

M3 runs the server through supported coding agents and lets you assert on the calls they actually make, rather than stopping at server unit tests.

Which coding agents are named as supported?

The description names Claude Code, Codex, OpenCode, and Pi.

Do tests require an API key?

Direct tests require no API key. The description does not extend that statement to agent-driven tests.

How can I inspect runs and use M3 in CI?

Use m3 ui to view traces and tool calls. The m3 ci test --upload command gates pull requests and keeps runs on app.m3.sineframe.com.

Is SineFrame M3 open source?

Yes. SineFrame M3 is described as open source under the Apache-2.0 license.

Coding / product dossier

SineFrame M3

Tests MCP servers through real coding agents and asserts on their tool calls in pytest.

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Product brief

What SineFrame M3 does.

Your MCP unit tests pass, but did the agent call the tool? M3 runs your server through real Claude Code, Codex, OpenCode or Pi and asserts on the calls they actually made, in plain pytest. Direct tests need no API key. m3 ui shows every trace and tool call; m3 ci test --upload gates PRs and keeps runs on app.m3.sineframe.com. Open source, Apache-2.0.

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SineFrame M3

What SineFrame M3 does.

What it can help with.

Agent-driven MCP testing

Pytest assertions

Direct tests without an API key

Trace and tool-call inspection

Pull-request gates and uploaded runs

Before you open it.

When we picked it.

SineFrame M3

What SineFrame M3 does.

What it can help with.

Agent-driven MCP testing

Pytest assertions

Direct tests without an API key

Trace and tool-call inspection

Pull-request gates and uploaded runs

Before you open it.

When we picked it.

iwant

Semwright

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