sumo-qa 0.3.1

Sumo QA — a senior-QA-shaped MCP server for pre-coding QA planning, TDD scaffolding, mutation-testing follow-up, code review, and test-data discovery.

sumo-qa MCP

An MCP server and skills library that gives AI coding agents a senior-QA workflow. Works with Claude Code, Cursor, Codex, OpenCode, JetBrains AI Assistant + Junie, and VS Code + GitHub Copilot.

[!IMPORTANT] sumo-qa is an advisor, not an oracle. Like any AI tool it can be wrong. Your judgment and your team's standards are the final word.

🚀 New here? 5-minute demo →

One install line, one prompt on your repo, the workflow runs on real code.

Why it exists

Ask a stock AI assistant to QA a change and you get the junior answer: "add unit tests, consider edge cases, maybe test performance." That's a checklist.

sumo-qa makes the agent work the way a senior QA does:

• Names 3–7 risks tied to specific files and lines, not categories
• Picks one design technique per risk from an ISTQB-grounded catalogue (boundary-value, decision-table, property-based, mutation)
• Runs your test suite fresh in the current turn before any "safe to merge" claim
• Holds TDD's red phase before any production code is written
• Keeps production code locked while strengthening tests against mutation survivors
• Won't ship a plan without measurable entry and exit criteria

The discipline lives in 14 skill files (1 router + 13 sub-skills). The host LLM follows them literally, and each one has an Iron Law and a HARD-GATE callout the LLM can't talk past. Skills route automatically from natural-language prompts; you don't need to remember to invoke them.

Install

pip install sumo-qa && sumo-qa-install --claude-code

Other hosts: swap --claude-code for --vscode --workspace <path-to-repo>, --jetbrains, or drop the flag to configure every host on the machine. Works the same on macOS, Linux, and Windows (pip generates .exe wrappers, so no python3 invocation).

Restart your host or open a fresh chat afterwards.

Per-host flags, schema differences, and troubleshooting: docs/INSTALL.md.

Verify it's wired

In any host, ask:

load the QA classifications

You should get 10 names back: api_contract_change, business_logic_change, security_change, performance_change, frontend_change, infrastructure_change, test_change, docs_change, config_change, data_migration. If you do, you're wired.

Update

pip install --upgrade sumo-qa && sumo-qa-install

Restart the host. The SessionStart hook re-injects the latest content; skills and knowledge refresh from the upgraded package.

What's included

Layer	What
14 skills (skills/)	Iron-Law procedures: deciding approach, preparing for work, TDD scaffolding, diff review, strengthening tests, finding test data, answering testing questions, repo strategy — plus the planning → parallel subagent execution → finishing chain.
24 MCP entry points	14 skill tools, 6 knowledge loaders, 4 test-data tools. Thin file IO, no inference.
4 knowledge catalogues (knowledge/)	Classifications, approaches, principles, techniques. The agent picks from these instead of recalling from training data. Editable as plain markdown. Specialty-tool picks are deliberately not catalogued — the discipline is observe the risk surface, web-search current options for the user's stack, cite when naming a tool.

Host support

Every host calls the same MCP server and reads the same SKILL.md files. What differs is how each host exposes them — that's a host-API difference, not a sumo-qa choice.

These hosts are verified end-to-end with sumo-qa-install:

Host	Slash	Setup
Claude Code	/sumo-qa-deciding-approach (hyphens)	sumo-qa-install --claude-code
VS Code + Copilot (Agent mode, Claude Sonnet 4.5 or equivalent)	Natural language	sumo-qa-install --vscode --workspace <repo> writes .vscode/mcp.json
JetBrains AI Assistant	/sumo_qa_deciding_approach (underscores)	One-time UI setup; sumo-qa-install --jetbrains prints the fields to paste
JetBrains Junie	Natural language	Drop the JSON sumo-qa-install prints into ~/.junie/mcp/sumo-qa.json (global) or <repo>/.junie/mcp/ (per project)

In Claude Code, type / then sumo-qa- to see all 14 skills as hyphenated entries (symlinked into ~/.claude/skills/). The same skills are also registered through MCP with underscores (/sumo_qa_load_classifications, /sumo_qa_find_test_data); both routes call the same SKILL.md.

Natural language works everywhere. "Review my changes", "plan QA for this story", "load the QA classifications" — the agent routes by tool description. Slash and natural-language paths produce the same result.

Other MCP hosts (Cursor, Codex, OpenCode, etc.): pip install sumo-qa ships a standard stdio MCP server, so it should work with anything that speaks MCP. Follow your host's MCP-server setup docs and point it at the absolute path from sumo-qa-install --help. Not verified end-to-end by us, so we don't ship instructions.

See it in action

Ten transcripts showing the workflow on real code — diff reviews refusing to call safe-to-merge from stale CI, TDD cycles with the red output surfaced verbatim, mutation survivors walked one at a time, formal test plans gated on entry/exit criteria, and the case where the right answer is "no tests needed, stop here":

• tests/scenarios/worked-examples/ — start with 02 — review my changes for a representative end-to-end
• tests/scenarios/SCENARIOS.md — the scenario specs (prompt → expected shape → anti-patterns the skill prevents)

When sumo-qa doesn't fit

If your QA intent has no native fit (Playwright E2E, accessibility audits, k6 load testing), sumo-qa offers ([y/N]) to install Vercel Labs' find-skills meta-skill, which then searches and installs from skills.sh.

• No companion MCP shim. All CLI invocations go through the host LLM's Bash tool inside the skill.
• Node.js is required (for npx). If it's missing, sumo-qa prints the install URL and stops. It doesn't elevate via sudo.
• find-skills handles scope (global vs project-local), registry search, and install; sumo-qa's discipline wraps the response.

License

Apache 2.0. See NOTICE for attribution requirements that apply to forks and redistributors.

More docs

• AGENTS.md — AI-agent bootstrap and per-host setup
• docs/ARCHITECTURE.md — three layers, host delivery, knowledge authority
• docs/SKILLS.md — every skill with its Iron Law
• docs/TOOLS.md — every MCP entry point
• docs/INSTALL.md — per-host install detail and troubleshooting
• docs/CONFIGURATION.md — env vars
• docs/DEVELOPMENT.md — local dev
• docs/TEST-DATA.md — known-good test-data catalogue
• docs/PERSONA.md — optional Sumo-sensei voice (off by default)