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/samibs/skillfoundry/self-validatenpx skills add samibs/skillfoundry --skill self-validategit clone --depth 1 https://github.com/samibs/skillfoundryWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/samibs/skillfoundry/self-validate)<a href="https://agentmods.dev/skills/samibs/skillfoundry/self-validate"><img src="https://agentmods.dev/badge/skills/samibs/skillfoundry/self-validate.svg" alt="Measured on agentmods" height="20"></a>What 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 | $0.00011 | $0.02036 |
| Opus 5 | $0.00005 | $0.01018 |
| Sonnet 5 | $0.00002 | $0.00407 |
| Haiku 4.5 | $0.00001 | $0.00204 |
Grade A, and why
self-validate scanned grade A with 1 finding 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
| **API endpoint** | "When POST /auth/login, Then 200 with JWT" | `curl` against running server. Check status code + response body. | How it starts
The opening of the file, as written. The whole thing — 206 lines — stays where its author put it; the contents beside it link to each section on GitHub.
/self-validate — Output Verification Loop
Verify implemented work actually produces its expected output. Not "did tests pass?" — "does the running code match the acceptance criteria?"
Usage
/self-validate Validate the most recently implemented story
/self-validate [story-file] Validate a specific story file
/self-validate --all Validate all DONE stories in docs/stories/
/self-validate --ui Validate only frontend/UI stories (browser screenshot if MCP available)
Instructions
You are the Self-Validator. Your job is not to run tests — it is to observe whether the running system produces the exact output the acceptance criteria describe. Tests are assertions on paper. This is the real check.
The Core Loop
For each story to validate:
1. LOAD → Read the story file, extract all ACs (Gherkin: Given/When/Then)
2. CLASSIFY → Determine verification method per AC (see table below)
3. GENERATE → Write the exact verification command for each AC
4. EXECUTE → Run the command, capture stdout/stderr and exit code
5. COMPARE → Diff actual output against expected output from AC
6. REPORT → Pass ✓ / Fail ✗ with actual-vs-expected diff
7. FIX & RETRY → If any AC fails: route to fixer with delta, re-verify (max 3 iterations)
AC Classification and Verification Method
| Story Type | AC Pattern | Verification Method |
|---|---|---|
| API endpoint | "When POST /auth/login, Then 200 with JWT" | curl against running server. Check status code + response body. |
| Business logic | "When calculateTax(100), Then returns 12.5" | Run the specific unit test for that function. Check output. |
| Database | "When user record created, Then email is unique-indexed" | Query the DB directly. Check schema + constraints. |
| UI / Frontend | "When dashboard loads, Then shows 5 recent jobs" | If Puppeteer/Playwright MCP available: screenshot + inspect DOM. Else: curl the page, grep for expected elements. |
| CLI command | "When sf forge --dry-run, Then outputs IGNITE phase" | Run the command, grep for expected output. |
| File output | "When forge completes, Then audit.jsonl entry written" | Check file exists, cat last line, parse JSON. |
| Integration | "When A calls B, Then C is updated" | Run end-to-end sequence, check final state. |
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 · 206 lines · 11 tokens per session scan A 28d03935c71b
self-validate is a skill published in the GitHub repository samibs/skillfoundry (12 stars, last pushed today), licensed MIT. It adds 11 tokens to every session and 2,036 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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