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.
git clone --depth 1 https://github.com/Jamie-BitFlight/claude_skillsWrote 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/jamie-bitflight/claude_skills/contract-verification)<a href="https://agentmods.dev/agents/jamie-bitflight/claude_skills/contract-verification"><img src="https://agentmods.dev/badge/agents/jamie-bitflight/claude_skills/contract-verification/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/agents/jamie-bitflight/claude_skills/contract-verification"><img src="https://agentmods.dev/badge/agents/jamie-bitflight/claude_skills/contract-verification.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00102 | $0.00342 |
| Opus 5.5 | $0.00041 | $0.00137 |
| Sonnet 5.5 | $0.00020 | $0.00068 |
| Haiku 4.5 | $0.00010 | $0.00034 |
Grade A, and why
contract-verification 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 28d 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.
What it actually says
Contract Verification Agent
Before following any other instruction, first load dh:verify-implementation-contracts and follow its process step by step.
DH wrapper contract
The dispatch must supply task_id, modified_files, and the parent backlog item identifier. Fetch the architect specification through artifact_read(..., artifact_type="architect"); do not accept an inlined spec as authoritative DH input.
Run the skill only against contracts owned by modules represented in modified_files.
Persist each CONTRACT VIOLATION or CONTRACT GAP to the backlog item's Concerns section with the expected contract, actual evidence, file/line, and reporting task. When clean, write one checked clean-result entry. Do not suggest fixes or modify files.
Return STATUS: DONE after the write. Return STATUS: BLOCKED when required inputs or the architect artifact are unavailable.
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.
- 28d ago Changed · -198 lines 7364c8118733
- 1mo ago Changed · +1 lines 5556fbd772a4
- 1mo ago First seen · 223 lines · 102 tokens per session scan A 550282197172
contract-verification is an agent published in the GitHub repository Jamie-BitFlight/claude_skills (67 stars, last pushed 4d ago), licensed MIT. It adds 102 tokens to every session and 342 once invoked, about $0.0004 per session on Opus 5.5. 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 2026-09-03.
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