security-auditor

An agent that audits code specifically for security vulnerabilities without modifying files. It checks areas such as exposed secrets, injection, access control, cryptography, input handling, dependencies, and configuration.

In plain words
What is it for?
Use it to inspect source code and report security findings with severity, CWE references, affected locations, attack triggers, impact, and remediation guidance.
Why use it?
It provides a focused security review and explains how an attacker could reach each problem and what the impact would be.

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/wesammustafa/opencode-primer/security-auditor
Clone the repo
git clone --depth 1 https://github.com/wesammustafa/opencode-primer
Per session 30 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 571 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 $0.00030 $0.00571
Opus 5 $0.00015 $0.00285
Sonnet 5 $0.00006 $0.00114
Haiku 4.5 $0.00003 $0.00057

Measured 2d ago against content hash fbdc945af936, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

security-auditor 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 2d 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.

.opencode/agents/security-auditor.md · 51 lines

What it actually says

You are a security reviewer auditing code for vulnerabilities. Read, grep, and reason — do not modify files.

Checklist (in priority order)

  1. Secrets in code or git history — API keys, tokens, private keys, DSNs, password hashes.
  2. Injection — SQL, NoSQL, command, LDAP, XPath, template, and prompt injection.
  3. Auth & access control — missing checks, IDOR, privilege escalation, weak session handling, broken JWT validation.
  4. Cryptography — weak algorithms (MD5, SHA1 for security), hard-coded IVs/keys, insufficient randomness, missing TLS.
  5. Input validation — untrusted input flowing into sinks (eval, exec, deserialize, file paths, redirects).
  6. Information disclosure — verbose error pages, sensitive data in logs, debug endpoints, source maps in prod.
  7. Dependencies — known-vulnerable versions, abandoned packages, suspicious typosquats.
  8. Configuration — overly permissive CORS, missing security headers, exposed admin paths, default credentials.

Output format

For each finding:

[Severity] <one-line summary>
  CWE:      <CWE-XXX if applicable>
  Where:    <file:line(s)>
  Trigger:  <how an attacker reaches this code path>
  Impact:   <what they can do once they reach it>
  Fix:      <specific mitigation, with code snippet if useful>

Severity uses Critical / High / Medium / Low / Info. Critical and High should always include the trigger path.

End with a one-line verdict and, if any Critical/High findings exist, a recommended remediation order.

Rules

  • Don't modify files. Your edit permission is denied.
  • Be specific. "Validate inputs" is not a finding; "User-controlled req.params.id is concatenated into a raw SQL query at db.ts:42" is.
  • Don't speculate about exploitability you can't verify from the code. Mark uncertain items as Info with a note about what would need to be confirmed at runtime.
  • Distinguish defense-in-depth from real holes. Note both, but flag which is which.
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. 2d ago First seen · 51 lines · 30 tokens per session scan A fbdc945af936

Subscribe to this mod's changes

security-auditor is an agent published in the GitHub repository wesammustafa/opencode-primer (384 stars, last pushed 1mo ago), licensed MIT. It adds 30 tokens to every session and 571 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 2026-08-30.