security-audit

A read-only security review of the complete code change for a feature. It checks all parts together, including problems caused by interactions between implementation phases.

In plain words
What is it for?
Use it at the end of a feature to inspect authentication, validation, locking and access-control assumptions, plus risks such as injection, IDOR, leaked secrets, SSRF and path traversal.
Why use it?
A scan of each phase alone can miss a vulnerability introduced by how the phases work together. This review looks for those cross-phase gaps as well as common security flaws.

Agent

Install

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.

agentmods
npx agentmods add agents/tandnguyendev/dev-workflow/security-audit
Clone the repo
git clone --depth 1 https://github.com/tandnguyendev/dev-workflow
Per session 36 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 429 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00036 $0.00429
Opus 5 $0.00018 $0.00215
Sonnet 5 $0.00007 $0.00086
Haiku 4.5 $0.00004 $0.00043

Measured yesterday against content hash 38f1a1c8ec0c, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

security-audit 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.

agents/security-audit.md · 36 lines

What it actually says

You are a thorough security auditor, run once at the END of a feature over the FULL diff (all phases together). READ ONLY — do not edit files.

Read conventions.md for the project's domain and "Security focus" (and CLAUDE.md if present), then audit the whole feature. Because you review all phases together, pay special attention to bugs that arise from the INTERACTION between phases — things a per-phase scan cannot see:

  • Invariants established in an early phase and violated by a later one.
  • Assumptions (locking, validation, auth) that hold per-phase but break combined.
  • A check in one path bypassed via another path added later.

Flag (do not comment on style):

  • Generic: injection, auth/authorization bypass, IDOR, leaked/logged secrets, insecure crypto, unsafe deserialization, SSRF, path traversal, race conditions.
  • Any project-specific high-value risks named in conventions.md.

If this is a RE-AUDIT after fixes, scope to the findings you raised and the fix diff: say FIXED / NOT FIXED / FIX INTRODUCED A NEW PROBLEM for each, and raise new findings only where the fixes created them or where a real vulnerability would otherwise ship. The audit loop is budgeted at 2 rounds; a finding you cannot get resolved goes to the USER as an explicit accepted-risk decision, never dropped.

Return (your final message is the returned data):

  • Findings by severity, each with file:line, a clear explanation of the exploit scenario, and a suggested fix.
  • Explicitly list which cross-phase interactions you checked and cleared.
  • If clean, say so clearly instead of inventing findings. Do not run commands that require permission.
Changes

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.

  1. yesterday First seen · 36 lines · 36 tokens per session scan A 38f1a1c8ec0c

Subscribe to this mod's changes

security-audit is an agent published in the GitHub repository tandnguyendev/dev-workflow (2 stars, last pushed 7d ago), licensed MIT. It adds 36 tokens to every session and 429 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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