implement

A workflow for implementing code from a written specification or a list of tickets. It guides investigation, testing, review, and committing the finished changes.

In plain words
What is it for?
Use it to build requested features, fix ticketed work, run type checks and tests, review the result, and commit the changes.
Why use it?
It gives implementation work a consistent path from understanding the request to checking the result. TDD, or test-driven development, is used when it adds useful coverage rather than for every small change.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/mrclrchtr/supi/implement
Any agent
npx skills add mrclrchtr/supi --skill implement
Clone the repo
git clone --depth 1 https://github.com/mrclrchtr/supi

Made for: Claude Code, Codex.

Per session 16 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 141 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00016 $0.00141
Opus 5 $0.00008 $0.00071
Sonnet 5 $0.00003 $0.00028
Haiku 4.5 $0.00002 $0.00014

Measured 2d ago against content hash dc639dd7cf2c, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

implement scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/engineering/implement/SKILL.md · 18 lines

What it actually says

Implement the work described by the user in the spec or tickets.

Investigate the code first. Then load /tdd and use it where it adds value, at seams agreed with the user. Do not force a TDD cycle for trivial behavior, but still write tests when they provide useful coverage.

Run typechecking regularly, single test files regularly, and the full test suite once at the end.

Once done, use /code-review to review the work.

After the review, load /commit and follow its instructions to commit the changes.

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 18 lines · 16 tokens per session scan A dc639dd7cf2c

Subscribe to this mod's changes

implement is a skill published in the GitHub repository mrclrchtr/supi (79 stars, last pushed 2d ago), licensed MIT. It adds 16 tokens to every session and 141 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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