test-author

A coding agent that writes unit and integration tests, plus Playwright browser tests when end-to-end testing is enabled. TDD means writing tests to check software behaviour.

In plain words
What is it for?
Use it after components are built to create tests for their variants and states with the project's selected test tools.
Why use it?
It removes the need to create test files and choose test patterns manually for each component.

Agent for Claude Code

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 agents/punkadillo/figma-code-composer/test-author
Clone the repo
git clone --depth 1 https://github.com/punkadillo/figma-code-composer

Made for: Claude Code.

Per session 62 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,413 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 $0.00062 $0.02413
Opus 5 $0.00031 $0.01207
Sonnet 5 $0.00012 $0.00483
Haiku 4.5 $0.00006 $0.00241

Measured 2d ago against content hash 20334ec7279b, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

test-author 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.

.claude/agents/test-author.md · 126 lines

How it starts

The opening of the file, as written. The whole thing — 126 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Role

Test writer. Given a slice { componentNames, paths, variants, states, framework, tests }, emit one test file per component using the project's chosen unit runner + testing library. When tests.e2e.enabled, also emit Playwright E2E specs under tests.e2e.outputDir.

Binding: protocols/skills.md — load skills per stack + agent additions: senior-qa, tdd-guide, javascript-testing-patterns. When tests.e2e.enabled, also load the playwright-* family. protocols/component-layout.md § File layout names test file conventions.

Inputs

componentNames, paths from run-summary; variants, states from manifest; configSnapshot = frozen { framework, language, tests.{unit.{enabled,framework,outputDir,testingLibrary},e2e.{enabled,framework,outputDir}}, designSystemName, designSystemThemeName }.

Execute the directive — do not re-reason

Your slice carries a buildPlan directive (protocols/figma-manifest.md § buildPlan), passed in Brevit wire form when smaller (protocols/brevit.md — read the flattened key.path:value lines directly; do not demand JSON). These directive fields are already decided by the coordinator's think-once pass — execute them, do NOT re-derive them: resolvedLayer, apiShape, renderMode. Re-derive ONLY what the directive omits. If a field you need is absent, derive it and note that in your return notes. NEVER silently override a field that IS present — a present field is authoritative (the whole point of think-once is that this reasoning happened once).

Emission discipline — comment economy

Minimal, single-line inline comments (hard cap ≤80 chars, leader→EOL excl. indentation) — no narrative block/banner comments, no comment that restates an assertion. Let describe/it titles carry intent instead of comments; prefer self-documenting names. Cuts output tokens every build. Full rule: protocols/figma-manifest.md § Emission discipline.

Write scope

  • Unit/integration tests — co-located with each component (or under tests.unit.outputDir when not co-located). Only when tests.unit.enabled.
  • E2E specs — under tests.e2e.outputDir (user-chosen at wizard time: co-located default, or e2e/ / tests/e2e/ / custom). Only when tests.e2e.enabled.

Read the full file on GitHub · 126 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 · 126 lines · 62 tokens per session scan A 20334ec7279b

Subscribe to this mod's changes

test-author is an agent published in the GitHub repository punkadillo/figma-code-composer (3 stars, last pushed 13d ago), licensed MIT. It adds 62 tokens to every session and 2,413 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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