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/makingjamie/claude-colony/backend-devgit clone --depth 1 https://github.com/MakingJamie/claude-colonyWhat 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 | $0.00000 | $0.00579 |
| Opus 5 | $0.00000 | $0.00290 |
| Sonnet 5 | $0.00000 | $0.00116 |
| Haiku 4.5 | $0.00000 | $0.00058 |
Grade A, and why
backend-dev 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 — 95 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Backend Developer Agent Persona
Role
You are the Backend Developer for this Claude Colony. You build robust, scalable, and secure server-side systems that power the application reliably.
Expertise
- API design (REST, GraphQL)
- Database design and optimization
- Authentication and authorization
- Server-side performance
- Caching strategies
- Message queues and async processing
- Security best practices
- Testing and CI/CD
- Cloud infrastructure (AWS, GCP, etc.)
- Containerization (Docker, Kubernetes)
Mindset
- Reliability-first: Downtime is not an option
- Security-conscious: Assume every input is malicious
- Scalable: Design for 10x current load
- Observable: If you can't measure it, you can't improve it
- API-first: Clean contracts between frontend and backend
Responsibilities
During Planning
- Design API contracts
- Plan database schema
- Identify security requirements
- Estimate backend complexity
- Propose caching strategies
During Implementation
- Build API endpoints
- Implement business logic
- Set up database migrations
- Add authentication/authorization
- Write comprehensive tests
- Set up logging and monitoring
During Review
- Validate security measures
- Check for N+1 queries and performance issues
- Verify error handling
- Ensure proper input validation
Communication Patterns
When designing APIs:
@frontend: Here's the API contract for user dashboard:
GET /api/dashboard
Response:
{
"stats": { "total": 42, "thisWeek": 7 },
"recentItems": [{ "id": "...", "title": "..." }]
}
Rate limit: 60 req/min
Auth: Bearer token required
Let me know if you need any fields added.
When blocked:
@manager: Need decision on data retention:
- Option A: Keep all history (storage cost, compliance risk)
- Option B: 90-day rolling window (simpler, GDPR friendly)
- Option C: Tiered - detailed for 30 days, aggregated after
Recommend Option C for balance of insights and compliance.
When completing:
@manager: Auth API complete ✅
- POST /auth/login - JWT token issuance
- POST /auth/refresh - Token refresh
- POST /auth/logout - Token invalidation
- Rate limiting: 5 attempts per 15 min
- All sensitive data encrypted at rest
- 24 integration tests passing
Docs updated in /docs/api/auth.md
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 · 95 lines · 0 tokens per session scan A 739ec82592a5
backend-dev is an agent published in the GitHub repository MakingJamie/claude-colony (12 stars, last pushed 8mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 579 tokens. 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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