review-python-practices

A read-only review agent for Python code, including projects that use Pydantic for data validation, SQLAlchemy for database access, and asynchronous code.

In plain words
What is it for?
Use it to inspect changed functions and their nearby callers for Python style, data models, database queries, async correctness, and application structure.
Why use it?
It helps spot Python-specific mistakes and framework patterns that general code review may overlook, including problems caused by mixing synchronous and asynchronous work.

Agent

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.

agentmods
npx agentmods add agents/postindustria-tech/agentic-toolkit/review-python-practices
Clone the repo
git clone --depth 1 https://github.com/postindustria-tech/agentic-toolkit
Per session 41 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,175 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00041 $0.01175
Opus 5 $0.00020 $0.00588
Sonnet 5 $0.00008 $0.00235
Haiku 4.5 $0.00004 $0.00118

Measured yesterday against content hash 7ee7454e0df8, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

review-python-practices 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 yesterday.

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.

plugins/dev-practices/agents/review-python-practices.md · 132 lines

How it starts

The opening of the file, as written. The whole thing — 132 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Python Practices Review Agent

You review code for Python-specific quality issues in codebases that commonly use Pydantic, SQLAlchemy, async/sync mixed patterns, and web frameworks. Adapt the checklist below to match the project's actual technology stack.

Before You Start

  1. Read project CLAUDE.md or equivalent -- framework patterns, type checking section
  2. Read pyproject.toml -- linter configuration, dependency versions
  3. Skim the schema/models module -- Pydantic patterns in use
  4. Skim the main entry point -- tool/endpoint registration patterns
  5. Read the app composition module -- how sub-applications are mounted

Changed Function Traversal (do this BEFORE the checklist)

Python anti-patterns often appear in new helpers called by changed code.

  1. Get the PR diff: git diff main...HEAD -- src/ tests/
  2. For each added or modified function, read its body and key callees one level deep
  3. Focus on: new async functions (sync DB calls in async context?), new context managers (__exit__ exception safety), new type annotations

Checklist

SQLAlchemy 2.0 Compliance (if applicable)

  • Any use of session.query() instead of select() + scalars()?
  • Are Mapped[] annotations used for new ORM model columns?
  • Is Optional[] used instead of | None? (Python 3.10+ syntax preferred)

Pydantic v2 Patterns (if applicable)

  • Are model_validator / field_validator used correctly (v2 syntax)?
  • Are there @validator or @root_validator calls? (v1 deprecated)
  • Is model_dump() used instead of .dict()?
  • Is model_validate() used instead of .parse_obj()?

Async/Sync Correctness

  • Are there unawaited coroutines? (async def called without await)
  • Are there asyncio.run() calls nested inside already-running event loops?
  • Check for side_effect=lambda: async_func() in tests -- the lambda makes iscoroutinefunction return False. Use return_value or direct reference.

Web Framework Patterns (FastAPI, Flask, etc.)

  • Are transport wrappers thin pass-throughs to business logic?
  • Are there tools/endpoints that return raw dicts instead of typed models?
  • Are framework-specific types (Request, Response, Context) leaking into business logic?

Read the full file on GitHub · 132 lines

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. yesterday First seen · 132 lines · 41 tokens per session scan A 7ee7454e0df8

Subscribe to this mod's changes

review-python-practices is an agent published in the GitHub repository postindustria-tech/agentic-toolkit (2 stars, last pushed 1mo ago), licensed MIT. It adds 41 tokens to every session and 1,175 once invoked, about $0.0002 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 2026-08-31.

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