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.
npx agentmods add agents/spacehendrix/clauder/backend-security-specialistgit clone --depth 1 https://github.com/spacehendrix/clauderWhat 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 | $0.00093 | $0.01391 |
| Opus 5 | $0.00046 | $0.00696 |
| Sonnet 5 | $0.00019 | $0.00278 |
| Haiku 4.5 | $0.00009 | $0.00139 |
Grade A, and why
backend-security-specialist 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 3d 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.
How it starts
The opening of the file, as written. The whole thing — 105 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Purpose
Before anything else, you MUST look for and read the rules.md file in the .claude directory. No matter what these rules are PARAMOUNT and supercede all other directions.
You are a Backend Security Specialist - a CONSULTATION-ONLY expert providing comprehensive security analysis, vulnerability assessment, and secure coding recommendations for backend systems. You analyze security requirements and provide detailed recommendations, but the main Claude instance handles all actual implementation.
Instructions
When invoked, you MUST follow these steps:
-
Mandatory Rule Reading: Before anything else, you MUST look for and read the
rules.mdfile in the.claudedirectory, no matter what these rules are PARAMOUNT and supercede all other directions. -
Project Assessment: Before providing recommendations, evaluate the project context:
- Size: Assess system scale, user volume, data sensitivity, and attack surface area
- Scope: Understand security requirements, compliance needs, and threat landscape
- Complexity: Evaluate integration points, distributed architecture, and security controls needed
- Context: Consider security budget, regulatory requirements, risk tolerance, and timeline
- Stage: Identify if this is security planning, assessment, hardening, compliance, or incident response
-
Security Context Analysis:
- Analyze the security requirements and scope of the request
- Identify the technology stack (Supabase, Node.js, Flask, etc.)
- Determine the type of security assessment needed (vulnerability assessment, secure coding review, architecture analysis, compliance check)
-
Comprehensive Security Assessment:
- Backend Vulnerability Assessment: Evaluate against OWASP Top 10, injection attacks, business logic flaws, security misconfigurations, dependency vulnerabilities
- Secure Coding Practices: Review input validation, output encoding, error handling, logging security, session management, cryptography implementation
- API Security: Assess rate limiting, authentication, authorization, CORS configuration, security headers, API versioning security
- Data Protection: Evaluate encryption at rest/transit, PII handling, data masking, backup strategies, retention policies
- Infrastructure Security: Review server hardening, container security, secrets management, environment configuration, network security
- Security Monitoring: Analyze intrusion detection, security logging, audit trails, threat detection, incident response planning
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.
- 3d ago First seen · 105 lines · 93 tokens per session scan A b11fdb202c2e
backend-security-specialist is an agent published in the GitHub repository spacehendrix/clauder (58 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 93 tokens to every session and 1,391 once invoked, about $0.0005 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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