gsd-security-auditor

gsd-security-auditor is an agent for Claude Code from lalitnayyar/finally. It costs 37 tokens per session (1,065 once invoked), scanned A, original, MIT.

An agent that checks whether the security protections planned in a project's threat model exist in the implemented code. A threat model lists possible attacks and how each should be handled.

In plain words
What is it for?
Use it to verify planned mitigations, record accepted or transferred risks, and produce a SECURITY.md report.
Why use it?
It checks declared security requirements without performing an unfocused vulnerability scan or changing the application code.

Agent for Claude Code

Written for Claude Code: installed under .claude/.

Good fit Use it to verify planned mitigations, record accepted or transferred risks, and produce a SECURITY.md report.

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Install with agentmods
npx agentmods add agents/lalitnayyar/finally/gsd-security-auditor
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.

Clone the repo
git clone --depth 1 https://github.com/lalitnayyar/finally

Made for: Claude Code.

Wrote 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.

agentmods badge for gsd-security-auditor

README.md
[![agentmods](https://agentmods.dev/badge/agents/lalitnayyar/finally/gsd-security-auditor/github.svg)](https://agentmods.dev/agents/lalitnayyar/finally/gsd-security-auditor)
Your own site
<a href="https://agentmods.dev/agents/lalitnayyar/finally/gsd-security-auditor"><img src="https://agentmods.dev/badge/agents/lalitnayyar/finally/gsd-security-auditor/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.

agentmods 80×15 button for gsd-security-auditor

Your own site · 80×15
<a href="https://agentmods.dev/agents/lalitnayyar/finally/gsd-security-auditor"><img src="https://agentmods.dev/badge/agents/lalitnayyar/finally/gsd-security-auditor.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 37 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,065 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00037 $0.01065
Opus 5.5 $0.00015 $0.00426
Sonnet 5.5 $0.00007 $0.00213
Haiku 4.5 $0.00004 $0.00106

Measured 13d ago against content hash df17a91f2cff, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

gsd-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 13d 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.

.claude/agents/gsd-security-auditor.md · 129 lines

How it starts

The opening of the file, as written. The whole thing — 129 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Does NOT scan blindly for new vulnerabilities. Verifies each threat in <threat_model> by its declared disposition (mitigate / accept / transfer). Reports gaps. Writes SECURITY.md.

Mandatory Initial Read: If prompt contains <files_to_read>, load ALL listed files before any action.

Implementation files are READ-ONLY. Only create/modify: SECURITY.md. Implementation security gaps → OPEN_THREATS or ESCALATE. Never patch implementation.

<execution_flow>

Disposition Verification Method
mitigate Grep for mitigation pattern in files cited in mitigation plan
accept Verify entry present in SECURITY.md accepted risks log
transfer Verify transfer documentation present (insurance, vendor SLA, etc.)

Classify each threat before verification. Record classification for every threat — no threat skipped.

For each threat_flag in SUMMARY.md ## Threat Flags: if maps to existing threat ID → informational. If no mapping → log as unregistered_flag in SECURITY.md (not a blocker).

Write SECURITY.md. Set threats_open count. Return structured result.

</execution_flow>

<structured_returns>

SECURED

## SECURED

**Phase:** {N} — {name}
**Threats Closed:** {count}/{total}
**ASVS Level:** {1/2/3}

### Threat Verification
| Threat ID | Category | Disposition | Evidence |
|-----------|----------|-------------|----------|
| {id} | {category} | {mitigate/accept/transfer} | {file:line or doc reference} |

### Unregistered Flags
{none / list from SUMMARY.md ## Threat Flags with no threat mapping}

SECURITY.md: {path}

Read the full file on GitHub · 129 lines

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. 13d ago First seen · 129 lines · 37 tokens per session scan A df17a91f2cff

Subscribe to this mod's changes

gsd-security-auditor is an agent published in the GitHub repository lalitnayyar/finally (0 stars, last pushed 6mo ago), licensed MIT. It adds 37 tokens to every session and 1,065 once invoked, about $0.0001 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 2026-10-03.

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