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/hypnguyen1209/offensive-claudeWrote 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/commands/hypnguyen1209/offensive-claude/engage.cvediff)<a href="https://agentmods.dev/commands/hypnguyen1209/offensive-claude/engage.cvediff"><img src="https://agentmods.dev/badge/commands/hypnguyen1209/offensive-claude/engage.cvediff/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/commands/hypnguyen1209/offensive-claude/engage.cvediff"><img src="https://agentmods.dev/badge/commands/hypnguyen1209/offensive-claude/engage.cvediff.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 | $0.00019 | $0.00467 |
| Opus 5 | $0.00010 | $0.00234 |
| Sonnet 5 | $0.00004 | $0.00093 |
| Haiku 4.5 | $0.00002 | $0.00047 |
Grade A, and why
engage.cvediff 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 12d 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
/engage.cvediff
Locates the fix commit(s) for a CVE across OSV / NVD / GitHub Advisories, de-duplicates them, and
optionally clones (scope-gated, hardened) to emit git diff fix^..fix — the start of n-day patch
diffing. Feeds skills/reverse-engineering/references/patch-diffing-protocol.md and can chain into
/engage.crash for root-cause + exploitability.
Usage
/engage.cvediff <CVE-id> [--source osv,nvd,ghsa] [--diff --repo <url> --sha <fix>]
Process
- Discover —
cve_diff.py find <CVE>queries each source, extracts every commit reference (github/gitlab/cgit + OSV GIT-rangefixedevents), merges by (repo, sha). A source that errors is recorded, not fatal. - Pick the canonical fix — prefer a commit confirmed by ≥2 sources (
also_in); verify the SHA exists in the repo before trusting it. - Diff (gated) —
cve_diff.py diff <CVE> --repo <url> --sha <fix> --scope .engage/scope/scope.json. The repo host is checked againstscope_guardFIRST (out-of-scope ⇒ refused, exit 3); the clone runs throughsafe_subprocess.git_safe(no hooks/prompt/host-config/ext-transport/symlinks). - Root cause — feed the diff into patch-diffing (BinDiff/ghidriff for binaries) or read it
directly; optionally
/engage.crashto prove reachability + empirical exploitability.
Notes
- Read-only public advisory APIs; the clone is the only state-changing step and it is scope-gated.
- A missing/ownership-changed fix commit is common — corroborate across sources; a single source is often wrong or stale.
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.
- 12d ago First seen · 33 lines · 19 tokens per session scan A 39ccd1d59fd9
engage.cvediff is a command published in the GitHub repository hypnguyen1209/offensive-claude (360 stars, last pushed 26d ago), licensed MIT. It adds 19 tokens to every session and 467 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 2026-08-30.
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