develop-small-feature

A workflow for implementing a small software feature or fix from its specification through a pull request. TDD, or test-driven development, means writing tests before the implementation.

In plain words
What is it for?
Handling a well-scoped change across a feature branch, tests, code checks, verification, a commit, and a pull request to the main branch.
Why use it?
It provides a defined path for small changes, including tests, static checks, user verification, and version-control review. This reduces the chance of skipping an important delivery step.

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/atman-33/workhub/develop-small-feature
Any agent
npx skills add atman-33/workhub --skill develop-small-feature
Clone the repo
git clone --depth 1 https://github.com/atman-33/workhub

Made for: Claude Code, Codex.

Per session 50 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,061 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 $0.00050 $0.01061
Opus 5 $0.00025 $0.00531
Sonnet 5 $0.00010 $0.00212
Haiku 4.5 $0.00005 $0.00106

Measured 2d ago against content hash 47ff7db85fd4, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

develop-small-feature 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.

plugins/engineering/skills/develop-small-feature/SKILL.md · 91 lines

How it starts

The opening of the file, as written. The whole thing — 91 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Develop Small Feature

Implement the feature or fix described below, carrying it through the full branch → TDD → static checks → user verification → commit → PR lifecycle.

This skill is scoped to small, well-scoped changes (a handful of files, a settled approach). For large or uncertain work — spanning many files, needing real debugging/trial-and-error, or warranting a deep review — use heavy-implementer and/or the code-review/simplify skills directly instead of forcing this flow.

Spec: $ARGUMENTS

If no spec is given as an argument, use the specification already established in this conversation (the user's most recent instructions, requirements already discussed, or an agreed-on OpenSpec change). Do not ask the user to repeat themselves if the spec is already clear from context; ask only if it is genuinely ambiguous.

Steps

  1. Feature branch. Run git branch --show-current.

    • If already on a branch other than the repository's default branch (e.g. an existing feature/* branch), stay on it — do not switch.
    • If on the default branch, invoke the create-feature-branch skill to create and switch to a new feature branch derived from the spec.
  2. Implement, test-first. Invoke the tdd skill to implement the change (red → green → refactor), delegating the work to the implementer agent by default. Do not use heavy-implementer unless the user explicitly asks for it, or implementer reports (or a retry shows) that the change needs cross-file debugging/trial-and-error it can't resolve — in that case escalate the rest of the work to heavy-implementer, which can drive its own TDD loop directly.

  3. Static checks. Delegate to test-runner to run the target repo's lint/format/check commands (e.g. npm run check for this marketplace) and report pass/fail. Let auto-fixable issues (formatters) be fixed directly; for remaining lint errors, delegate the fix to implementer and re-run the checks.

    • This intentionally replaces a full code-review/simplify pass — this skill targets small changes where lint + tests + the user's own look are enough. If the diff turns out larger or riskier than expected, tell the user and suggest running the code-review or simplify skill manually.

Read the full file on GitHub · 91 lines

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 · 91 lines · 50 tokens per session scan A 47ff7db85fd4

Subscribe to this mod's changes

develop-small-feature is a skill published in the GitHub repository atman-33/workhub (2 stars, last pushed 3d ago), licensed MIT. It adds 50 tokens to every session and 1,061 once invoked, about $0.0003 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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