Function Implementer — Testing & QA agent for Claude Code
Implements a single work unit (its functions/methods) based on the unit spec, visible tests, and TECHSTACK.md.
How to install Function Implementer
Installs to ~/.claude/agents/hcazrej-claude-harness-function-implementer.md
mkdir -p ~/.claude/agents && curl -fsSL https://raw.githubusercontent.com/HcaZreJ/claude-harness/HEAD/agents/function-implementer.md -o ~/.claude/agents/hcazrej-claude-harness-function-implementer.md Restart Claude Code, or start a new session, for it to be picked up.
What Function Implementer does
name: function-implementer description: "Implements a single work unit (its functions/methods) based on the unit spec, visible tests, and TECHSTACK.md. Cannot access hidden tests — only sees pass/fail counts via run-hidden-tests.sh. Use proactively when the architect needs per-work-unit implementation. Each work unit gets its own implementer agent instance." model: sonnet tools: Read, Write, Edit, Bash, Glob, Grep permissionMode: acceptEdits maxTurns: 50 color: orange hooks: PreToolUse:
Alternatives in Testing & QA
- Kraken — You are a specialized implementation agent 3.6k ★
- Visual Testing Agent (Playwright MCP) — You are the TESTER - the visual QA specialist who SEES and VERIFIES implementations using Playwright MCP 316 ★
- Bm Doc Classifier — Classifies a single planning document as ADR, PRD, SPEC, DOC, or UNKNOWN 92 ★
Full documentation available on GitHub
View Source RepositoryRelated Agents
Grays Run
Mechanical test runner (Haiku tier). Auto-detects pytest, jest, vitest, playwright. Runs tests, reports pass/f
Prober
Runs a build, test, lint, or any command and returns a pass/fail probe (exit code, warn/error counts) instead
Claudehut Test Runner
Runs the test suite and reports real pass/fail counts and failure causes — the fresh test evidence Review reco
Test Scoper
Given a set of changed files, maps them to relevant existing tests, builds and runs the correct scoped pytest
AI Provider Author
WRITE-access implementer for AI provider integrations, model routing, embeddings, prompt systems, streaming, a
Job Match Author
WRITE-access implementer for ATS scoring, job analysis, keyword/skill/requirement extraction, resume-job match
Related Skills
Claude Codex Handoff
A Claude Code skill that orchestrates a three-phase planner→implementer→reviewer workflow between Claude Code
Ae Expression Reference
Quick reference card for After Effects expression syntax: global objects, methods, functions, and common patte
Pioneer
Pioneer: the stop signal for agents. When an agent fails on a product, the next one is warned and gets the fix