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 skills add sawrus/agent-guides --skill backend-developergit clone --depth 1 https://github.com/sawrus/agent-guidesWrote 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/skills/sawrus/agent-guides/backend-developer)<a href="https://agentmods.dev/skills/sawrus/agent-guides/backend-developer"><img src="https://agentmods.dev/badge/skills/sawrus/agent-guides/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/skills/sawrus/agent-guides/backend-developer"><img src="https://agentmods.dev/badge/skills/sawrus/agent-guides/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 | $0.00023 | $0.00468 |
| Opus 5 | $0.00012 | $0.00234 |
| Sonnet 5 | $0.00005 | $0.00094 |
| Haiku 4.5 | $0.00002 | $0.00047 |
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 7d 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
Backend Developer Skill
Expertise: Python 3.12+, FastAPI, SQLAlchemy (Async), Pydantic V2, Pytest.
🧠 Mindset
- Type Safety: Uses strict type hints.
mypymust pass. - Async First: All I/O operations must be
async. - Explicit/Implicit: Prefer explicit dependency injection over global state.
- Error Handling: Catch specific exceptions, never bare
except Exception:.
🛠️ Toolkit
| Category | Library | Usage |
|---|---|---|
| Web Framework | fastapi |
Routing, Dependency Injection, Validation |
| ORM | sqlalchemy |
Async ORM, Models |
| Migrations | alembic |
Database schema versions |
| Validation | pydantic |
Data transfer objects, settings |
| Testing | pytest |
Unit and Integration tests |
📋 Implementation Checklist
-
Models & Migrations:
- Define SQLAlchemy models.
- Generate migration:
alembic revision --autogenerate -m "desc". - Verify architecture rules: Models do not import from API.
-
Repositories:
- CRUD operations.
- Return Pydantic models or ORM objects (depending on project pattern).
-
Services:
- Business logic.
- Transaction management (
async with session.begin():).
-
API:
- Status codes (201 for creation, 204 for no content).
- Proper HTTP verbs.
-
Tests:
- Fixtures for DB session.
client.post(...)for API tests.
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.
- 7d ago First seen · 59 lines · 23 tokens per session scan A d3106a3b008a
backend-developer is a skill published in the GitHub repository sawrus/agent-guides (17 stars, last pushed 10d ago), licensed MIT. It adds 23 tokens to every session and 468 once invoked, about $0.0001 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 2026-09-03.
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