A method for implementing the next ready task from a task list using test-driven development (TDD): write a failing test, add the smallest code that passes it, then clean up. It updates the task status and commits the completed work.

Use it to select the next unblocked task, build it in small vertical slices, run tests through each cycle, mark the task done, commit it, and report newly available tasks.

It keeps implementation focused on stated acceptance criteria and provides a test that checks each completed behavior. It also respects task dependencies and limits work to likely affected files.

build — Command for Claude Code by aneja5/forge-skills

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.

Clone the repo

git clone --depth 1 https://github.com/aneja5/forge-skills

Made for: Claude Code.

Or install forge-skills, the plugin that ships this one along with the rest of its 42 skills, 36 commands, 1 hook.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/commands/aneja5/forge-skills/build/github.svg)](https://agentmods.dev/commands/aneja5/forge-skills/build)

Your own site

<a href="https://agentmods.dev/commands/aneja5/forge-skills/build"><img src="https://agentmods.dev/badge/commands/aneja5/forge-skills/build/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/commands/aneja5/forge-skills/build"><img src="https://agentmods.dev/badge/commands/aneja5/forge-skills/build.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 14 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 170 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00014	$0.00170
Opus 5.5	$0.00006	$0.00068
Sonnet 5.5	$0.00003	$0.00034
Haiku 4.5	$0.00001	$0.00017

Measured 1mo ago against content hash 408c2b18184d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

build 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 1mo 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.

commands/build.md · 20 lines

What it actually says

Invoke the forge-skills:incremental-implementation skill, with forge-skills:tdd for each cycle.

Read .forge/tasks.yaml. Find the next unblocked task (dependencies complete, status not done). Load the task's contracts from .forge/contracts/. Load only files in files_likely_affected.

Implement using strict vertical slices: RED: write one failing test for one acceptance criterion GREEN: write minimum code to make it pass Repeat for each acceptance criterion REFACTOR: clean up while all tests stay green

Commit after each completed task: "[TASK-ID] " Update .forge/tasks.yaml status to done.

Report: which task was completed, which tasks are now unblocked.

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.

1mo ago First seen · 20 lines · 14 tokens per session scan A 408c2b18184d

Subscribe to this mod's changes

build is a command published in the GitHub repository aneja5/forge-skills (3 stars, last pushed 5mo ago), licensed MIT. It adds 14 tokens to every session and 170 once invoked, about $0.0001 per session on Opus 5.5. 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.

Claude Code TDD Testing agentic-engineering agents claude-code-plugin claude-code-skills design-system

build

Getting it into your agent

Wrote this? Show the measurements

What it costs to keep this loaded

Grade A, and why

Nothing flagged

What it actually says

What this file has done since we first saw it

Other commands, from other repositories

bug

qa

coder

tdd

uw-cmd-implement-feature

uw-cmd-create