Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/extra-org/extra/testingnpx skills add extra-org/extra --skill testinggit clone --depth 1 https://github.com/extra-org/extraWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00034 | $0.01144 |
| Opus 5 | $0.00017 | $0.00572 |
| Sonnet 5 | $0.00007 | $0.00229 |
| Haiku 4.5 | $0.00003 | $0.00114 |
Grade A, and why
testing scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 121 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill: Testing
Purpose
Define how to write and run tests for this Python project so that every meaningful behavior is covered by fast, deterministic, behavior-focused tests that never touch real external systems.
When to Use This Skill
- Adding or changing any behavior (tests accompany behavior — almost always).
- Fixing a bug (add a regression test first).
- Working on the test suite or quality gate (task
0012). - Reviewing whether a change is adequately tested.
Files to Read First
AGENTS.mddocs/DEVELOPMENT_WORKFLOW.mdpyproject.toml([tool.pytest.ini_options])- The skill for the area under test (runtime, prompts, plugins, tools, etc.).
Core Principles
- Use
pytest. Tests live undertests/, mirroringsrc/agentplatform/. - Test behavior through public interfaces, not private implementation details (test internals only when there is no public seam).
- No real external systems in unit tests: never call real LLMs, real MCP servers, real databases, or third-party APIs. Mock/fake them.
- Integration tests only when explicitly requested, and still without real secrets or live third-party calls — use fakes/local stand-ins.
- Deterministic: control time, randomness, and ordering.
- Regression tests for bugs: every fixed bug gets a test that fails before the fix.
Process
- Pick the category (see below) for what you are testing.
- Arrange with fixtures for repeated setup (specs, compiled graphs, fake
resolver/access plugins, fake tools). Use
@pytest.mark.parametrizefor input variations. - Mock external boundaries (LLM/MCP/DB/HTTP) at the adapter seam, not deep inside.
- Write behavior assertions: given input, assert observable output/effects.
- Cover negatives and security: invalid YAML/validation errors, missing required prompt variables, denied protected-node access, plugin errors.
- Run
make test(andmake checkfor the full gate). Fix failures.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2d ago First seen · 121 lines · 34 tokens per session scan A 30d38b3f8142
testing is a skill published in the GitHub repository extra-org/extra (108 stars, last pushed 4d ago), licensed MIT. It adds 34 tokens to every session and 1,144 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other skills, from other repositories
skill-doc-delivery
Convert markdown to DOCX, PPTX, XLSX, PDF office documents — use when you need exportable deliverables.
peekaboo
Capture and automate macOS UI with the Peekaboo CLI.
powerpoint
Create designed, editable PowerPoint .pptx presentations with PptxGenJS. Use when the user asks to create, generate, update, or inspect a deck, slide deck, presentation, or .pptx file.
oracle
Best practices for using the oracle CLI (prompt + file bundling, engines, sessions, and file attachment patterns).
skill-intent-contract
Use when starting a complex or ambiguous task that risks scope drift.
skill-security-framing
URL validation and content sanitization for untrusted sources — use when handling external input safely.