skill CX Codex

implementation — Claude Code skill: what it does, how to install

Q: How to install implementation in Claude Code?

Run `npx skills add cyrusagents/cyrus --skill implementation -a claude-code` in your terminal.

Guides the agent to write production-ready code following existing patterns, handle errors, and avoid scope creep before verification.

Install into Claude Code · Skills CLI (Vercel) All methods and platforms ↓

npx skills add cyrusagents/cyrus --skill implementation -a claude-code

Open on GitHub

What implementation does

This skill sets concrete boundaries for drafting production code in Claude Code and supported IDEs. The agent inspects existing repository patterns and matches them closely. It ignores unrelated cleanup. Edits remain strictly focused on the requested scope.

Workflow progression is explicit. When automated tests fail, the model must fix them immediately instead of advancing to subsequent tasks. Testing strategy leans on verify-and-ship. The agent runs relevant existing tests or direct checks, reserving fresh tests exclusively for consequential regressions worth long-term maintenance.

Because the instructions explicitly route output to a verification and shipping phase, using this skill outside the broader Cyrus workflow requires handling the next handoff step on your own.

What it helps with

implement requested changes without drifting into unrelated refactoring
preserve existing repository patterns and conventions
handle edge cases and runtime failure scenarios
prepare code for the verify-and-ship workflow step
resolve failing tests before proceeding to the shipping phase

Example prompts for the agent

Implement the requested feature changes while following our existing code style
Handle edge cases in this data parser without touching unrelated modules
Add the new calculation logic and ensure all current tests pass before shipping

How to install implementation

1Skills CLI (Vercel)

npx skills add cyrusagents/cyrus --skill implementation -a claude-code

2Manually: put the files in place

~/.claude/skills/implementation/SKILL.md

Copy the whole skill folder; for one project use .claude/skills/implementation/

1Skills CLI (Vercel)

npx skills add cyrusagents/cyrus --skill implementation -a codex

2Manually: put the files in place

.agents/skills/implementation/SKILL.md

For all projects use ~/.agents/skills/

1Skills CLI (Vercel)

npx skills add cyrusagents/cyrus --skill implementation -a cursor

2Manually: put the files in place

.cursor/skills/implementation/SKILL.md

Cursor also reads .agents/skills/ and .claude/skills/

1GitHub CLI

gh skill install cyrusagents/cyrus implementation

2Manually: put the files in place

.github/skills/implementation/SKILL.md

1Skills CLI (Vercel)

npx skills add cyrusagents/cyrus --skill implementation -a gemini-cli

2Platform CLI

gemini skills install https://github.com/cyrusagents/cyrus --path skills/implementation

Manually: put the files in place

.devin/skills/implementation/SKILL.md

The legacy .windsurf/skills/ path still works

Skills CLI (Vercel)

npx skills add cyrusagents/cyrus --skill implementation -a opencode

Step by step, with commands for each platform: How to install skills in Claude Code: five ways

Questions about implementation

How to install implementation in Claude Code?

Run npx skills add cyrusagents/cyrus --skill implementation -a claude-code in your terminal.

What does the implementation skill do?

It instructs the agent to write production-ready code matching project conventions, handle errors properly, and avoid modifying unrelated code.

Does the skill require writing new tests for every change?

No, it instructs the agent to rely on existing tests or direct checks. New tests are only written for consequential regressions worth maintaining over time.

Source text

SKILL.md · Apache-2.0

---
name: implementation
description: Implement the requested changes. Write production-ready code, follow existing patterns, and use proportionate verification.
---

# Implementation

Implement the requested changes:

- Write production-ready code that follows existing patterns and conventions
- Choose verification using `verify-and-ship`: use relevant existing tests or direct checks; add new tests only for concrete consequential regressions worth maintaining
- Handle edge cases and error scenarios appropriately
- Keep changes focused on what was requested — avoid unrelated improvements

If tests fail, fix them before moving on to the next phase of the workflow.

When implementation is complete, proceed to the verification and shipping phase.

incremental-implementation addyosmani Directs agents to deliver code in thin, verified vertical slices instead of bulk edits. Fits multi-file refactoring and feature work behind flags. CX Codex +1 61,900installs principle-test-behavior-not-implementation backnotprop A rule for tests you write or keep: assert what callers can observe. Turns tests that break on every refactor into ones that catch real bugs. CX Codex +1 5,200installs task-workflow customware-ai Turns a task into a phased protocol with artifacts and gates, and blocks the agent from stopping before phase 7. CX Codex +1 1,900installs build-loop-claude-code BuilderOS Runs every task through build, review, end-to-end test and fix. It keeps going until the plan's checkboxes are all ticked. CX Codex +1 1,700installs build-loop-cursor BuilderOS A skill that walks a feature through build, /review, end-to-end testing and fixes. Handy when the work follows a plan with checkboxes. CX Codex +1 1,500installs superpowers-lab sickn33 Sets an evaluation workflow to test experimental upstream skills against a baseline in an isolated environment before adopting them. CX Codex +1 1,400installs

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google Searches the web with WebSearch and opens relevant pages through WebFetch. Use it when an agent needs current facts or topic research. CX Codex +1 931installs cyrus-setup-slack Sets up a Cyrus Slack integration through an app created from a prepared manifest. Use it when the agent needs to respond in Slack channels. CX Codex +1 905installs summarize Formats a structured completion summary for Linear agent sessions. Useful when an agent finishes a task and needs to present clear results directly in Linear. CX Codex +1 886installs investigate Researches your repository files and functions, gathers context, and writes answers in Linear Markdown format. Helps when triaging tasks. CX Codex +1 863installs verify-and-ship This skill takes finished changes through acceptance checks, tests, changelog updates, commit, push and pull request creation. CX Codex +1 843installs release This skill walks a Cyrus CLI release through trusted publishing: prepare, verify, publish, finish. Useful when a version has to ship without touching packages by hand. CX Codex +1 829installs debug Works through a reported bug from reproduction to a minimal fix. Use it when you need to trace an error and verify the result. CX Codex +1 826installs f1-test-drive Checks whether a change needs F1 validation, then tests the affected product workflow or F1 harness end to end. CX Codex +1 804installs