TDD Repair

What it does

When your agent uses it

• Tasks that involve Test-driven development
• Tasks that involve Failing and flaky tests

Example prompts

• “/tdd-repair”

Requirements

• Node.js
• Pre-approved tools (allowed-tools): Bash

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

1. 1Pre-flight verify — run the test command. If it already passes, exit 2 (test-already-passes). Repairing a green test is either a no-op or…
2. 2Spawn claude -p with a focused prompt
3. 3allowedTools Read,Edit,Bash restricts capability. --max-budget-usd caps cost per attempt. --permission-mode acceptEdits auto-accepts file…
4. 4Re-run the test to verify. The test's exit code IS the fitness function — no separate sandbox / LLM-as-judge.
5. 5If green: emit success: true + per-attempt usage. If red after --max-attempts: emit success: false + receipts. Either way, the workspace…

What it can do on your machine

Read from SKILL.md and the folder at commit 6c04654. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves these tools, so the agent can use them without asking each time:

  • Bash

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Shell commands in SKILL.md call:

  • claude
  • node
  • git

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  Links to these hosts (documentation or services it may open):

  • github.com

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

TDD Repair loads about 1.6k tokens when it runs. Until then it costs about 100 tokens; SKILL.md has 567 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~100

When it runs · the whole SKILL.md, loaded when a task matches

~1.6k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

• NotePre-approves every shell command (allowed-tools: Bash)SKILL.md

  allowed-tools: Bash

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from ruvnet/ruflo at commit 6c04654, republished under its MIT licence (© ruvnet). 567 words, ~1,565 tokens.

name

tdd-repair

description

Test-Driven Repair — given a failing test, spawn a bounded headless `claude -p` (Read/Edit/Bash only) that makes the test pass without modifying it. Modeled on agent-harness-generator's ADR-175 Test-Driven Repair mode. Bounded cost via --max-budget-usd, bounded capability via --allowedTools. Closes the loop the TDD plugins didn't — we generate tests, this fixes the code to satisfy them.

allowed-tools

Bash

argument-hint

--repo <path> --test <path> --test-command <cmd> [--max-attempts 1] [--budget 5.00] [--model haiku] [--confirm]

{
  "success": true,
  "data": {
    "repaired": true,
    "attemptsTaken": 1,
    "mode": "test-driven",
    "before": { "passed": false, "exitCode": 1 },
    "after":  { "passed": true,  "exitCode": 0, "durationMs": 4321 },
    "attempts": [
      { "attempt": 1, "claude": { "ok": true, "durationMs": 38421, "usage": { "cost_usd": 0.0234 } }, "verify": { "passed": true } }
    ],
    "totalCostUsd": 0.0234,
    "budgetUsd": 5.0,
    "budgetExhausted": false,
    "shape": { "repo": "...", "test": "...", "testCommand": "...", "maxAttempts": 1, "model": "haiku" }
  }
}

# Smoke / dry-run (no --confirm yet)
node plugins/ruflo-testgen/scripts/tdd-repair/tdd-repair.mjs \
  --repo /path/to/myrepo \
  --test tests/auth.test.ts \
  --test-command "npx vitest run tests/auth.test.ts"

# Actually repair (Haiku tier, $5 budget, 1 attempt)
node plugins/ruflo-testgen/scripts/tdd-repair/tdd-repair.mjs \
  --repo /path/to/myrepo \
  --test tests/auth.test.ts \
  --test-command "npx vitest run tests/auth.test.ts" \
  --confirm

# Bigger model + more attempts for harder bugs
node plugins/ruflo-testgen/scripts/tdd-repair/tdd-repair.mjs \
  --repo . --test tests/regression-2456.test.ts \
  --test-command "npm test -- tests/regression-2456.test.ts" \
  --model sonnet --max-attempts 3 --budget 15.00 \
  --confirm

© ruvnet, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in plugins/ruflo-testgen/skills/tdd-repair of ruvnet/ruflo.

Open the folder on GitHubat commit 6c04654