test-writer

Subagent "test-writer" from PostHog/posthog: Use this agent to identify and test a distinct, realistic regression that existing tests do not catch, including…

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IndexedNOASSERTION★ 40,411

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Works with Claude Code. Read the repository before you give any tool access to your data.

curl -fsSL https://raw.githubusercontent.com/PostHog/posthog/master/.claude/agents/test-writer.md -o test-writer.md

Read it and adapt it to your project before use.

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About

A Claude Code subagent definition in PostHog/posthog. Its description says: Use this agent to identify and test a distinct, realistic regression that existing tests do not catch, including during test-driven development. Do not generate a comprehensive suite by default. Invoke /writing-tests before changing test setup or assertions. Examples: <example> Context: The user has just implemented a new function and wants to ensure it has proper test coverage. user: "I've written a function to calculate user permissions. Can you write tests for it?" assistant: "I'll check the existing permission tests, then add only the missing regression case if one is needed." <commentary> Model: sonnet.

Use cases: testing

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What's in it

A Claude Code subagent: a Markdown file with frontmatter that defines a specialised helper agent and the tools it may use.

For: Claude Code
Length: 31 lines
File: .claude/agents/test-writer.md
name: test-writer
model: sonnet
description: Use this agent to identify and test a distinct, realistic regression that existing tests do not catch, including during test-driven development. Do not generate a comprehensive suite by default. Invoke /writing-tests before changing test setup or assertions.\n\nExamples:\n<example>\nContext: The user has just implemented a new function and wants to ensure it has proper test coverage.\nuser: "I've written a function to calculate user permissions. Can you write tests for it?"\nassistant: "I'll che

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The repository's license isn't open source, so the text isn't shown here. Read it on GitHub.

Signals

Stars: 40,411
Forks: 3,551
Open issues: 3,850
Contributors: 596
Last commit (this folder): Sep 30, 2026 (28 days ago)
Last release: Oct 24, 2026 (4 days ago)

From GitHub (fetched Oct 24, 2026).

Details

License: NOASSERTION
Repository: github.com/PostHog/posthog
First seen: Oct 24, 2026
Last checked: Oct 24, 2026
Source: GitHub github-graphql