loop-implement

A single implementation workflow that plans a change using documented guidance, then executes the resulting ordered tasks. It writes tests first, uses an independent test-quality review, and retries after reflecting on failures.

In plain words
What is it for?
Implementing features, bug fixes, logic changes, and behavior-changing refactors through a planned, test-first workflow.
Why use it?
It provides a repeatable path from a feature or bug report to tested code, with explicit checks when the first attempt is not good enough.

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/choiyounggi/dev-loop/loop-implement
Any agent
npx skills add choiyounggi/dev-loop --skill loop-implement
Clone the repo
git clone --depth 1 https://github.com/choiyounggi/dev-loop

Made for: Claude Code, Codex.

Per session 94 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 4,036 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 $0.00094 $0.04036
Opus 5 $0.00047 $0.02018
Sonnet 5 $0.00019 $0.00807
Haiku 4.5 $0.00009 $0.00404

Measured yesterday against content hash 5a0f4d10d07a, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

loop-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 yesterday.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/gate-check.sh), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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/loop-implement/SKILL.md · 282 lines

How it starts

The opening of the file, as written. The whole thing — 282 lines — stays where its author put it; the contents beside it link to each section on GitHub.

loop-implement — the single implementation loop, driven by a wiki-plan

Drive work to "done" through a closed, methodology-grounded loop (sources at the bottom). This is dev-loop's one and only implementation skill — it both plans (via wiki-plan, step 2) and executes, so there is no separate executor. The plan wiki-plan produces is not a loose sketch: it fixes an ordered task list and, for each task, navigates to the exact wiki pages that ground it (the decision→page map). This loop consumes that plan directly — executing the tasks in the plan's order, loading exactly the wiki pages each task names, and citing them — so every change traces back to a verified wiki page.

It works the same whether it runs standalone (you produce the plan here in step 2) or as an orchestrated worker (the orchestrator hands you a task brief and the plan it already produced, and you adopt and implement it here). Either path, one loop.

When to use

  • Use: logic changes, new features, bug fixes, behavior-changing refactors.
  • Skip: typos, config values, simple rename/import cleanup, one-line edits.

Two entry modes (both run the SAME loop)

  • A plan already exists (a plans/<feature>/ from a prior wiki-plan run, or handed to you by the orchestrator): skip producing one — execute its tasks in the ## Task order sequence, one at a time, each through steps 0 and 3–7 below, loading that task's named wiki pages.
  • No plan yet (a fresh standalone task): step 2 runs wiki-plan first to produce the ordered, wiki-navigated plan, then you execute it the same way.

The plan step is fixed (not pluggable)

Step 2 (Plan) is hardwired to the bundled wiki-plan skill and is mandatory for every non-trivial task — it is not a pluggable role and cannot resolve to inline planning. wiki-plan grounds each design decision in the bundled wiki/ semantic layers before any code is written, so the implementing pass executes decisions instead of guessing them. See step 2 below.

Read the full file on GitHub · 282 lines

Files

What ships with it

1 file 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. yesterday First seen · 282 lines · 94 tokens per session scan A 5a0f4d10d07a

Subscribe to this mod's changes

loop-implement is a skill published in the GitHub repository choiyounggi/dev-loop (4 stars, last pushed 2d ago), licensed MIT. It adds 94 tokens to every session and 4,036 once invoked, about $0.0005 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.

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