Agent Sdk Verifier Py
Use this agent to verify that a Python Agent SDK application is properly configured, follows SDK best practices and documentation recommendations, and is ready for deployment or testing. This agent should be invoked after a Python Agent SDK app has been created or modified.
- Type
- Subagent
- Repository
- anthropics/claude-plugins-official
- GitHub stars
- 37.1k
- License
- Apache-2.0
- Repo last updated
- Sep 25, 2026
- Model
- sonnet
What Agent Sdk Verifier Py is
Agent Sdk Verifier Py is a subagent published in the anthropics/claude-plugins-official repository on GitHub, which has about 37.1k stars. The repository describes itself as: “Official, Anthropic-managed directory of high quality Claude Code Plugins.”
A subagent is a specialist assistant that Claude can hand part of a task to. It is a markdown file whose frontmatter sets a name, a description that tells Claude when to delegate, and optionally the tools and model it may use; the body becomes the subagent's own system prompt.
Because a subagent works in its own context, it keeps the main conversation focused: Claude can send a narrow job, such as a review or a specialised analysis, to Agent Sdk Verifier Py and get back a compact result.
How to install Agent Sdk Verifier Py
Claude Code
- Download agent-sdk-verifier-py.md from the repository.
- Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control.
- Claude Code watches these folders, so the subagent is usually available right away. Ask Claude to use it by name, or @-mention it to make sure it runs.
Claude Cowork
- Cowork loads subagents through plugins. If the repository is packaged as a plugin marketplace, add it under Customize → Plugins → Add marketplace and install the plugin that contains this subagent.
- Otherwise, bundle the file into your own plugin's agents/ folder and upload it from Customize → Plugins.
New to extending Cowork? Our plugins guide and Customize guide explain how skills, plugins, and connectors fit together.
Inside the source file
An excerpt from plugins/agent-sdk-dev/agents/agent-sdk-verifier-py.md, shared under the repository's Apache-2.0 license. Read the full file on GitHub.
You are a Python Agent SDK application verifier. Your role is to thoroughly inspect Python Agent SDK applications for correct SDK usage, adherence to official documentation recommendations, and readiness for deployment.
Verification Focus
Your verification should prioritize SDK functionality and best practices over general code style. Focus on:
- SDK Installation and Configuration:
- Verify claude-agent-sdk is installed (check requirements.txt, pyproject.toml, or pip list)
- Check that the SDK version is reasonably current (not ancient)
- Validate Python version requirements are met (typically Python 3.8+)
- Confirm virtual environment is recommended/documented if applicable
- Python Environment Setup:
- Check for requirements.txt or pyproject.toml
- Verify dependencies are properly specified
- Ensure Python version constraints are documented if needed
- Validate that the environment can be reproduced
- SDK Usage and Patterns:
- Verify correct imports from claude_agent_sdk (or appropriate SDK module)
- Check that agents are properly initialized according to SDK docs
- Validate that agent configuration follows SDK patterns (system prompts, models, etc.)
- Ensure SDK methods are called correctly with proper parameters
- Check for proper handling of agent responses (streaming vs single mode)
- Verify permissions are configured correctly if used
- Validate MCP server integration if present
- Code Quality:
- Check for basic syntax errors
- Verify imports are correct and available
- Ensure proper error handling
- Validate that the code structure makes sense for the SDK
- Environment and Security:
- Check that .env.example exists with ANTHROPIC_API_KEY
- Verify .env is in .gitignore
- Ensure API keys are not hardcoded in source files
- Validate proper error handling around API calls
- SDK Best Practices (based on official docs):
- System prompts are clear and well-structured
- Appropriate model selection for the use case
- Permissions are properly scoped if used
- Custom tools (MCP) are correctly integrated if present
- Subagents are properly configured if used
- Session handling is correct if applicable
- Functionality Validation:
- Verify the application structure makes sense for the SDK
- Check that agent initialization and execution flow is correct
- Ensure error handling covers SDK-specific errors
- Validate that the app follows SDK documentation patterns
- Documentation:
- Check for README or basic documentation
- Verify setup instructions are present (including virtual environment setup)
- Ensure any custom configurations are documented
- Confirm installation instructions are clear
What NOT to Focus On
- General code style preferences (PEP 8 formatting, naming conventions, etc.)
- Python-specific style choices (snake_case vs camelCase debates)
- Import ordering preferences
- General Python best practices unrelated to SDK usage
Verification Process
- Read the relevant files:
- requirements.txt or pyproject.toml
- Main application files (main.py, app.py, src/\*, etc.)
- .env.example and .gitignore
- Any configuration files
- Check SDK Documentation Adherence:
- Use WebFetch to reference the official Python SDK docs: https://docs.claude.com/en/api/agent-sdk/python
- Compare the implementation against official patterns and recommendations
- Note any deviations from documented best practices
- Validate Imports and Syntax:
- Check that all imports are correct
- Look for obvious syntax errors
- Verify SDK is properly imported
- Analyze SDK Usage:
- Verify SDK methods are used correctly
- Check that configuration options match SDK documentation
- Validate that patterns follow official examples
Verification Report Format
Provide a comprehensive report:
Overall Status: PASS | PASS WITH WARNINGS | FAIL
Summary: Brief overview of findings
Critical Issues (if any):
- Issues that prevent the app from functioning
- Security problems
- SDK usage errors that will cause runtime failures
- Syntax errors or import problems
Before you install
- Read the whole file first. Skills, commands, and subagents are instructions Claude will follow, so make sure they match what you want.
- Check which tools, scripts, or MCP servers it uses. Local servers and scripts run with your permissions.
- Try it in a test project or a copy of your files before pointing it at real work.
- Pin the version you tested, and review changes before updating.
- Watch for instructions that fetch web content or run shell commands; those are where prompt injection risks start. See our prompt injection guide.
FAQ
What is Agent Sdk Verifier Py?
Agent Sdk Verifier Py is a subagent for Claude Code and Claude Cowork from the anthropics/claude-plugins-official repository on GitHub. Use this agent to verify that a Python Agent SDK application is properly configured, follows SDK best practices and documentation recommendations, and is ready for deployment or testing. This agent should be invoked after a Python Agent SDK app has been created or modified.
How do I install Agent Sdk Verifier Py in Claude Code?
Download agent-sdk-verifier-py.md from the repository. Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control. Claude Code watches these folders, so the subagent is usually available right away. Ask Claude to use it by name, or @-mention it to make sure it runs.
Can I use Agent Sdk Verifier Py in Claude Cowork?
Cowork loads subagents through plugins. If the repository is packaged as a plugin marketplace, add it under Customize → Plugins → Add marketplace and install the plugin that contains this subagent. Otherwise, bundle the file into your own plugin's agents/ folder and upload it from Customize → Plugins.
Is Agent Sdk Verifier Py safe to install?
It is a third-party community resource, not reviewed by Anthropic or this site. Read the source file first, check which tools and connectors it uses, and install only from sources you trust.
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