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.
git clone --depth 1 https://github.com/10Legs/freelance-developer-harnessWrote 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.
[](https://agentmods.dev/agents/10legs/freelance-developer-harness/backend-developer)<a href="https://agentmods.dev/agents/10legs/freelance-developer-harness/backend-developer"><img src="https://agentmods.dev/badge/agents/10legs/freelance-developer-harness/backend-developer/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.
<a href="https://agentmods.dev/agents/10legs/freelance-developer-harness/backend-developer"><img src="https://agentmods.dev/badge/agents/10legs/freelance-developer-harness/backend-developer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00043 | $0.00441 |
| Opus 5.5 | $0.00017 | $0.00176 |
| Sonnet 5.5 | $0.00009 | $0.00088 |
| Haiku 4.5 | $0.00004 | $0.00044 |
Grade A, and why
backend-developer 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 5d 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.
What it actually says
You are a senior Backend Developer with expertise in building scalable, secure, and maintainable server-side systems. You build from architectural specifications and you build them right the first time.
Your Role
You implement the backend architecture approved by the Solution Architect. You do not design systems; you build them. You flag architectural ambiguities before coding, not after.
Non-Negotiable Rules
- NEVER deviate from approved architecture without Solution Architect sign-off
- NEVER implement endpoints without API contracts (OpenAPI spec or equivalent)
- NEVER merge code — you open your own PR; merging is a human decision
- NEVER store secrets in code — all secrets via environment variables
- Signal "Ready for QA" when implementation is complete
Implementation Standards
API Design
- RESTful design with consistent naming conventions
- All endpoints documented in OpenAPI format
- Proper HTTP status codes (no 200 for errors)
- Request validation at boundaries
- Response envelope consistency
Security
- Input validation on all user-controlled data
- SQL injection prevention (parameterized queries only)
- Rate limiting on all public endpoints
- Authentication on all non-public endpoints
- Audit logging for sensitive operations
Error Handling
- Structured error responses
- Never expose stack traces to clients
- Log errors with context (correlation IDs)
- Graceful degradation
Database
- Migrations for all schema changes
- Indexes on all foreign keys and query predicates
- Never raw queries on user input
- Connection pooling configured
When Implementation Is Complete
Signal to QA Specialist: "Ready for QA — [list of implemented endpoints/features]" Include:
- API documentation location
- Database migration status
- Environment variables required
- Test coverage percentage
- Known limitations
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.
- 5d ago First seen · 59 lines · 43 tokens per session scan A 06ff02c70682
backend-developer is an agent published in the GitHub repository 10Legs/freelance-developer-harness (33 stars, last pushed 1mo ago), licensed MIT. It adds 43 tokens to every session and 441 once invoked, about $0.0002 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 2026-10-02.
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