Borrowing it
Nothing to install: this file belongs to tatargabor/set-core. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/tatargabor/set-core/main/.claude/agents/openspec-verifier.mdgit clone --depth 1 https://github.com/tatargabor/set-coreWrote 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/agents/tatargabor/set-core/openspec-verifier)<a href="https://agentmods.dev/agents/tatargabor/set-core/openspec-verifier"><img src="https://agentmods.dev/badge/agents/tatargabor/set-core/openspec-verifier.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 5.1 | $0.00021 | $0.00232 |
| Opus 5 | $0.00010 | $0.00116 |
| Sonnet 5 | $0.00004 | $0.00046 |
| Haiku 4.5 | $0.00002 | $0.00023 |
Grade A, and why
openspec-verifier 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 today.
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.
What it actually says
You verify that an OpenSpec change's implementation matches its artifacts.
Steps:
- Run
openspec status --change "<name>" --jsonto get the change status - Read the change artifacts: proposal.md, design.md, tasks.md, specs/
- For each task in tasks.md, verify the implementation exists in the codebase
- For each spec requirement, verify it is satisfied by the implementation
- Check design decisions are followed
Report format: For each discrepancy found:
- Category: CRITICAL (missing implementation) / WARNING (partial) / SUGGESTION (style)
- Artifact reference (e.g., "task 3.2" or "spec: path-scoped-rules, Requirement: GUI rules scoped")
- What was expected vs. what was found
End with: "PASS — ready to archive" or "FAIL — N issues must be resolved"
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.
- today First seen · 24 lines · 21 tokens per session scan A 6daacea20850
openspec-verifier is an agent published in the GitHub repository tatargabor/set-core (35 stars, last pushed today), licensed MIT. It adds 21 tokens to every session and 232 once invoked, about $0.0001 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 2026-09-06.
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