python-engineer

python-engineer is an agent for Claude Code from dshakes/compass. It costs 65 tokens per session (408 once invoked), scanned A, original, MIT.

A coding agent focused on making changes to Python projects using current Python conventions, type hints, data validation, and automated tests.

In plain words
What is it for?
Use it for focused Python features and bug fixes, especially in services, data pipelines, or machine-learning connections, including the related tests and code checks.
Why use it?
It reduces the risk of inconsistent code, unchecked input, hidden errors, and changes that pass only the simplest test cases.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md). Also seen: model in frontmatter.

Good fit Use it for focused Python features and bug fixes, especially in services, data pipelines, or machine-learning connections, including the related tests and code checks.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/dshakes/compass/python-engineer
Install

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.

Clone the repo
git clone --depth 1 https://github.com/dshakes/compass

Made for: Claude Code.

Wrote 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.

agentmods badge for python-engineer

README.md
[![agentmods](https://agentmods.dev/badge/agents/dshakes/compass/python-engineer/github.svg)](https://agentmods.dev/agents/dshakes/compass/python-engineer)
Your own site
<a href="https://agentmods.dev/agents/dshakes/compass/python-engineer"><img src="https://agentmods.dev/badge/agents/dshakes/compass/python-engineer/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.

agentmods 80×15 button for python-engineer

Your own site · 80×15
<a href="https://agentmods.dev/agents/dshakes/compass/python-engineer"><img src="https://agentmods.dev/badge/agents/dshakes/compass/python-engineer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 65 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 408 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00065 $0.00408
Opus 5.5 $0.00026 $0.00163
Sonnet 5.5 $0.00013 $0.00082
Haiku 4.5 $0.00006 $0.00041

Measured 1mo ago against content hash e2b94e32d573, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

python-engineer 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.

claude/agents/python-engineer.md · 31 lines

What it actually says

You are an experienced Python engineer. You write Python that looks like the rest of the repo and ships clean.

Standards

  • Target 3.11+ with full type hints on public functions; ruff clean for both lint and format.
  • pydantic models or dataclasses over loose dicts at any boundary or config surface — validate untrusted input, don't trust shape.
  • No bare except:; catch specific exceptions and add context; never swallow.
  • Prefer uv for envs/deps when the repo uses it; don't hand-edit lockfiles.
  • I/O-bound concurrency with asyncio honored end to end (no sync blocking calls on the event loop); CPU-bound work off the loop.
  • Tests for new logic (pytest); cover the error and edge paths, not just happy.

Workflow

Read the surrounding module and its tests first. Make the change. Add/extend tests. Run ruff check, ruff format --check, and pytest on what you touched (plus mypy/pyright if the repo runs it). Report what changed, the results, and anything you'd flag for review. Don't expand scope beyond the task.

Paste the actual command output. If a required check couldn't run (tool or permission missing), report it as UNVERIFIED and say why — never claim a check passed or output is "clean" unless you ran it and saw it pass.

Changes

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.

  1. 1mo ago First seen · 31 lines · 65 tokens per session scan A e2b94e32d573

Subscribe to this mod's changes

python-engineer is an agent published in the GitHub repository dshakes/compass (19 stars, last pushed 3d ago), licensed MIT. It adds 65 tokens to every session and 408 once invoked, about $0.0003 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 2026-08-30.

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