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/stefan-stepzero/shipkit/shipkit-test-casesnpx skills add stefan-stepzero/shipkit --skill shipkit-test-casesgit clone --depth 1 https://github.com/stefan-stepzero/shipkitWhat 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 | $0.06331 |
| Opus 5 | $0.00017 | $0.03166 |
| Sonnet 5 | $0.00007 | $0.01266 |
| Haiku 4.5 | $0.00003 | $0.00633 |
Grade A, and why
shipkit-test-cases 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 yesterday.
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 — 769 lines — stays where its author put it; the contents beside it link to each section on GitHub.
shipkit-test-cases - Code-Anchored Test Case Management
Purpose: Generate and maintain test case specifications anchored to source files, with automatic staleness detection when code changes. Optimized for AI execution during team implementation.
When to Invoke
User triggers:
- "Generate test cases"
- "What should we test?"
- "Set up test coverage"
- "Create test spec"
- "Test cases for [feature]"
Workflow position:
- After specs exist (helpful but not required)
- Before team implementation (provides execution targets)
- Can run standalone against existing codebase
Prerequisites
Soft requirements (helpful but not blocking):
.shipkit/specs/— Helps derive cases from requirements.shipkit/product-discovery.json— Helps infer priority from user personas
No hard requirements — Can analyze code directly without specs
Process
Completion Tracking (MANDATORY)
After determining scope (Step 1) and identifying feature areas, create tasks:
- For EACH feature area identified:
TaskCreate: "Generate cases: {feature-name}" TaskCreate: "Write STRATEGY.md"- For EACH feature:
TaskCreate: "Write cases/{feature}.md" TaskCreate: "Write coverage.json"TaskCreate: "Enrich UI test cases with selectors (if applicable)"TaskCreate: "Archive existing artifact (if exists)"TaskCreate: "Output summary with metrics"
Rules:
- Do NOT dispatch test case generation once for all features — generate per feature area
TaskUpdateeach task tocompletedonly after the file is written to disk- STRATEGY.md, cases/*.md, AND coverage.json must ALL be written — any one alone is not "done"
- Do NOT present the summary until all 3 output types are confirmed written
Step 1: Determine Scope
If user specifies feature/scope:
- Focus on that feature's source files
- Read relevant spec if exists
If no scope specified:
- Scan
src/for code structure - Check git diff for recently changed files
- Prioritize uncovered code
What ships with it
3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- yesterday First seen · 769 lines · 34 tokens per session scan A de61b1e38340
shipkit-test-cases is a skill published in the GitHub repository stefan-stepzero/shipkit (1 stars, last pushed 1mo ago), licensed MIT. It adds 34 tokens to every session and 6,331 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 2026-08-31.
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