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implement-feature

Implements a feature in an existing codebase, end to end, with tests.

Skill by YauhenBichel

IndexedApache-2.0
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Works with Claude Code, Claude apps, Codex, Cursor, Gemini CLI, GitHub Copilot, VS Code, OpenCode, Goose, Windsurf. Read the repository before you give any tool access to your data.

npx agentmarket install skill/yauhenbichel-implement-feature

Asks which of your tools to add it to (Claude Code, Codex, Cursor, VS Code, Windsurf, Gemini CLI, Claude Desktop) and shows the change first. See https://agentmart.dev/cli.

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About

Implements a feature in an existing codebase, end to end, with tests. Use for any new behaviour.

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Permissions

What this skill can do and what it asks for, from its SKILL.md. Checked Oct 25, 2026.

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Network hosts it talks to 1

  • codeload.github.com · found in install command

Files it touches

  • ~/.claude/skills/implement-feature

What's inside

Skill name
implement-feature
Description
Implements a feature in an existing codebase, end to end, with tests. Use for any new behaviour.
License
Apache-2.0
Instructions
24 lines in SKILL.md · view on GitHub

Files (1)

  • SKILL.md

SKILL.md (first lines)

## Steps
1. Read the surrounding code and follow its patterns. Note imports, class structure, and error handling conventions.
2. Identify the smallest change that delivers the acceptance criteria.
3. Write tests for the new behaviour in `tests/test_<feature>.py`. Write them before or alongside the code.
4. Handle errors at boundaries. Raise explicit exceptions or return `Optional` types. Never swallow failures.
5. Run the tests and linters: `uv run pytest tests/test_<feature>.py -v` and `uv run ruff check .`.
6. Summarise what changed and how it was checked.

## Checklist
- [ ] Tests cover happy path and boundary inputs
- [ ] No silent failures or bare `except` clauses
- [ ] `uv run pytest` passes locally
- [ ] `uv run ruff check .` reports no errors
- [ ] Existing tests remain green
- [ ] Diff matches acceptance criteria exactly
- [ ] Documentation or docstrings updated if needed

## Output
- Brief summary of files changed and logic added
- Commands run and their exit codes
- Link to the test file and relevant diff
- Confirmation that linters and tests pass

From YauhenBichel/engineering-skills, Apache-2.0.

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Last commit (this folder)
Oct 9, 2026 (19 days ago)

From GitHub (fetched Oct 24, 2026).

Details

License
Apache-2.0
First seen
Oct 24, 2026
Last checked
Oct 24, 2026

More from YauhenBichel

Cite this page

implement-feature skill. Agent Mart. https://agentmart.dev/skills/yauhenbichel-implement-feature (last updated 2026-10-24)