Borrowing it
Nothing to install: this file belongs to mtnyilmaz/agents. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/mtnyilmaz/agents/main/.agents/skills/python-developer/SKILL.mdgit clone --depth 1 https://github.com/mtnyilmaz/agentsWrote 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/mtnyilmaz/agents/python-developer)<a href="https://agentmods.dev/skills/mtnyilmaz/agents/python-developer"><img src="https://agentmods.dev/badge/skills/mtnyilmaz/agents/python-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/mtnyilmaz/agents/python-developer"><img src="https://agentmods.dev/badge/skills/mtnyilmaz/agents/python-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 | $0.00061 | $0.01515 |
| Opus 5.5 | $0.00024 | $0.00606 |
| Sonnet 5.5 | $0.00012 | $0.00303 |
| Haiku 4.5 | $0.00006 | $0.00152 |
Grade A, and why
python-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 1mo 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 — 211 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Python Developer
Expert in building production-grade Python services.
Reference Rules
Load these rules for the relevant context:
.agents/layers/language/python/python-patterns.md— Python type hints, Pydantic, async patterns.agents/layers/framework/django/django-patterns.md— FastAPI and Django patterns.agents/layers/concern/backend/api-design.md— REST API design principles.agents/layers/universal/security-baseline.md— security requirements
Project Stack (Modern Python 2026)
| Tool | Purpose |
|---|---|
| Python 3.12+ | Language (always latest stable) |
| FastAPI | HTTP framework (new services) |
| SQLAlchemy 2.x | ORM (async-first) |
| Alembic | Database migrations |
| Pydantic v2 | Validation & settings |
| pydantic-settings | Environment config |
| asyncpg | PostgreSQL async driver |
| Redis (aioredis) | Cache + sessions |
| Celery + Redis | Background tasks |
| structlog | Structured logging |
| pytest + pytest-asyncio | Testing |
| mypy (strict) | Type checking |
| ruff | Linting + formatting |
FastAPI Application Setup
# main.py
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from contextlib import asynccontextmanager
from .core.database import init_db
from .core.config import settings
from .core.errors import register_exception_handlers
from .api.v1 import router as v1_router
@asynccontextmanager
async def lifespan(app: FastAPI):
await init_db() # startup: create connection pool
yield
await close_db() # shutdown: close connections
app = FastAPI(
title="Service Name",
version="1.0.0",
lifespan=lifespan,
docs_url="/api/docs" if settings.debug else None, # hide docs in prod
)
app.add_middleware(
CORSMiddleware,
allow_origins=settings.cors_origins, # never ["*"] in production
allow_methods=["GET", "POST", "PUT", "PATCH", "DELETE"],
allow_headers=["Authorization", "Content-Type"],
allow_credentials=True,
)
register_exception_handlers(app)
app.include_router(v1_router, prefix="/api/v1")
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 1mo ago First seen · 211 lines · 61 tokens per session scan A a69f4aec25b4
python-developer is a skill published in the GitHub repository mtnyilmaz/agents (6 stars, last pushed 5mo ago), licensed MIT. It adds 61 tokens to every session and 1,515 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 2026-08-31.
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