Generate test scenarios, write the test file, and run it for a specific source file using the tailtest R1-R15 rule layer. When the agent needs to (1) cover a file the Stop hook skipped, (2) regenerate tests after refactoring, (3) test a legacy file Codex did not modify this session, or (4) explicitly run tailtest on a named file.
Scanned 9/12/2026
Install to Claude Code
Skills Directorynpx -y skills add thedixitjain/the-mega-skill-library --skill tailtest --agent claude-codeInstalls into .claude/skills of the current project.
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---
name: tailtest
description: "Generate test scenarios, write the test file, and run it for a specific source file using the tailtest R1-R15 rule layer. When the agent needs to (1) cover a file the Stop hook skipped, (2) regenerate tests after refactoring, (3) test a legacy file Codex did not modify this session, or (4) explicitly run tailtest on a named file."
category: ai-agents-and-harness
source_repo: hashgraph-online/awesome-codex-plugins
source_path: "plugins/avansaber/tailtest-codex/skills/tailtest/SKILL.md"
source_url: https://github.com/hashgraph-online/awesome-codex-plugins/blob/HEAD/plugins/avansaber/tailtest-codex/skills/tailtest/SKILL.md
---
Generate or update tests for $ARGUMENTS.
Read the source file at `$ARGUMENTS`. Generate production-like test scenarios covering its public surface -- happy path, key edge cases, and failure modes at the configured depth. Write or update the test file following the tailtest Step 4 rules in AGENTS.md (correct location, correct name, style-matched to existing tests). Run the tests and report only failures; stay silent if all pass.
Treat the file as new-file regardless of its git status -- this skill explicitly requests generation even for legacy files or files the Stop hook would normally skip.
After completing, update `.tailtest/session.json`: add the file to `generated_tests` and clear it from `pending_files` if present.
---
**Source:** [`hashgraph-online/awesome-codex-plugins`](https://github.com/hashgraph-online/awesome-codex-plugins) → `plugins/avansaber/tailtest-codex/skills/tailtest/SKILL.md`
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