executing

A step-by-step method for carrying out an implementation plan, with each change verified before moving to the next one.

In plain words
What is it for?
Use it to implement planned code changes, run checks after each step, and save completed work before continuing.
Why use it?
It keeps coding work small and reviewable and helps catch problems at each stage instead of at the end.

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/5uck1ess/devkit/executing
Any agent
npx skills add 5uck1ess/devkit --skill executing
Clone the repo
git clone --depth 1 https://github.com/5uck1ess/devkit

Made for: Claude Code, Codex.

Per session 24 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 486 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 $0.00024 $0.00486
Opus 5 $0.00012 $0.00243
Sonnet 5 $0.00005 $0.00097
Haiku 4.5 $0.00002 $0.00049

Measured yesterday against content hash 863ee71e39f6, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

executing 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 yesterday.

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/executing/SKILL.md · 50 lines

What it actually says

Executing

The Loop

For each step in the plan:

  1. Understand — Re-read the step. What exactly needs to change?
  2. Implement — Make the smallest change that completes the step.
  3. Verify — Run tests, check behavior, confirm it works.
  4. Commit — Save the working state before moving on.

Do not skip verify. Do not batch multiple steps into one change.

Discipline

  • One step at a time. Finish step N before starting step N+1. The urge to "quickly also do" the next thing leads to half-done work.
  • Don't go down rabbitholes. If you discover something unrelated that needs fixing, note it and come back later. Stay on the current step.
  • Keep changes small. A 20-line diff is easy to review. A 200-line diff hides bugs. If a step produces a large diff, it should have been broken into smaller steps.
  • Verify at the boundary. After completing a step, confirm the system still works end-to-end, not just the part you touched.

When Things Go Wrong

  • Step is harder than expected — Stop. Re-plan. Break it into sub-steps. Don't push through with a "it'll work out" mindset.
  • Step reveals a flaw in the plan — Update the plan. Plans are living documents.
  • Tests break — Fix them now, not later. Broken tests that you "plan to fix" become permanently broken tests.
  • You're stuck for 15+ minutes — Step back. Re-read the requirements. Try a different approach. Ask for help.

Checkpointing

Commit after each verified step. Commit messages should reference the plan step:

step 3: add input validation to parseConfig

This creates a clean, reviewable history and makes it easy to bisect if something breaks later.

Done Means Done

A step is done when:

  • The implementation matches the step description
  • All existing tests pass
  • Any new behavior has tests
  • The code is clean (no TODOs, no commented-out code, no "temporary" hacks)
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. yesterday First seen · 50 lines · 24 tokens per session scan A 863ee71e39f6

Subscribe to this mod's changes

executing is a skill published in the GitHub repository 5uck1ess/devkit (5 stars, last pushed 13d ago), licensed MIT. It adds 24 tokens to every session and 486 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 2026-08-31.

Related

Other skills, from other repositories