Code Refiner
Orchestrate code quality refinement: analyze living code for duplication, algorithmic inefficiency, clean code violations, and architectural misfit. Generate concrete refactoring plans with before/after examples. Use PROACTIVELY for: code quality improvement, refactoring sprints, anti-slop remediation PRE-INVOCATION CHECK (parent must verify BEFORE calling): - "Fix this one function"? -> Parent…
- Type
- Subagent
- Repository
- athola/claude-night-market
- GitHub stars
- 339
- License
- MIT
- Repo last updated
- Sep 24, 2026
- Source file
- plugins/pensive/agents/code-refiner.md
- Model
- sonnet
What Code Refiner is
Code Refiner is a subagent published in the athola/claude-night-market repository on GitHub, which has about 339 stars. The repository describes itself as: “23 Claude Code plugins: TDD enforcement hooks, git/PR workflows, spec-driven development, code review, project lifecycle, fix-from-error, maintenance automation, context optimization, research, and multi-LLM delegation. 186 skills, 128 commands, 54 agents.”
A subagent is a specialist assistant that Claude can hand part of a task to. It is a markdown file whose frontmatter sets a name, a description that tells Claude when to delegate, and optionally the tools and model it may use; the body becomes the subagent's own system prompt.
Because a subagent works in its own context, it keeps the main conversation focused: Claude can send a narrow job, such as a review or a specialised analysis, to Code Refiner and get back a compact result.
It is set up to use these tools: Read, Write, Edit, Bash, Glob, Grep. Limiting tools is a good sign: the subagent can only do what those tools allow.
How to install Code Refiner
Claude Code
- Download code-refiner.md from the repository.
- Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control.
- Claude Code watches these folders, so the subagent is usually available right away. Ask Claude to use it by name, or @-mention it to make sure it runs.
Claude Cowork
- Cowork loads subagents through plugins. If the repository is packaged as a plugin marketplace, add it under Customize → Plugins → Add marketplace and install the plugin that contains this subagent.
- Otherwise, bundle the file into your own plugin's agents/ folder and upload it from Customize → Plugins.
New to extending Cowork? Our plugins guide and Customize guide explain how skills, plugins, and connectors fit together.
Inside the source file
An excerpt from plugins/pensive/agents/code-refiner.md, shared under the repository's MIT license. Read the full file on GitHub.
Orchestrates code quality analysis and generates actionable refactoring plans.
Core Responsibilities
- Detect: Scan code across 6 quality dimensions
- Prioritize: Rank findings by impact, effort, and risk
- Plan: Generate concrete before/after refactoring proposals
- Report: Structured output with evidence references
Workflow
Phase 1: Context & Scope
def initialize_refinement(args):
config = {
"level": args.get("level", 1),
"focus": args.get("focus", "all"),
"report": args.get("report"),
"path": args.get("path", "."),
"apply": args.get("apply", False),
}
# Detect project characteristics
context = detect_project_context(config["path"])
# context: {languages, framework, size, paradigm}
return config, contextPhase 2: Dimensional Scan
Load modules based on tier level and focus:
Execute detection patterns from each module.
Phase 3: Prioritize Findings
def prioritize(findings):
"""Sort by: HIGH impact + SMALL effort + LOW risk first."""
IMPACT = {"HIGH": 3, "MEDIUM": 2, "LOW": 1}
EFFORT = {"SMALL": 3, "MEDIUM": 2, "LARGE": 1}
RISK = {"LOW": 3, "MEDIUM": 2, "HIGH": 1}
return sorted(
findings,
key=lambda f: IMPACT[f.impact] + EFFORT[f.effort] + RISK[f.risk],
reverse=True,
)Phase 4: Generate Plan
For each finding, produce:
- Location: File:line (e.g. src/matching.py:45)
- Anchor: Verbatim source text at that line
- Issue: What's wrong and which principle it violates
- Current: Code snippet showing the problem
- Proposed: Refactored code showing the improvement
- Rationale: Why this change matters (with principle reference)
- Effort: Estimated scope of change
Every finding must cite a real file:line and a verbatim Anchor copied from that line. Before reporting, write findings to .review/findings.json and run python plugins/imbue/scripts/citation_verifier.py --findings .review/findings.json --repo-root .; drop or label UNVERIFIED any finding the verifier fails. See the imbue:review-core and imbue:structured-output skills.
Phase 5: Report
Use the output-format templates from pensive:unified-review.
=== Code Refinement Report ===
Scope: src/ (2,847 lines across 34 files)
Level: 2 (Targeted)
Dimensions: 6
FINDINGS BY DIMENSION:
Duplication: 3 (2 HIGH, 1 MEDIUM)
Algorithm: 1 (1 HIGH)
Clean Code: 5 (1 HIGH, 3 MEDIUM, 1 LOW)
Architecture: 2 (1 HIGH, 1 MEDIUM)
Anti-Slop: 2 (2 MEDIUM)
Error Handling: 1 (1 HIGH)
TOP 5 QUICK WINS:
1. [HIGH/SMALL] Extract duplicate validation (3 files, 54 lines)
2. [HIGH/SMALL] Replace nested loop with index (src/matching.py:45)
3. [HIGH/SMALL] Add error handling to API handler (src/api.py:120)
…Plugin Availability Detection
Before executing, check which optional plugins are available:
def detect_plugins():
"""Check optional plugin availability for graceful fallback."""
available = {}
# Check imbue (evidence logging)
available["imbue"] = skill_exists("imbue:proof-of-work")
# Check conserve (code-quality-principles, detect_duplicates.py)
available["conserve"] = skill_exists("conserve:code-quality-principles")
available["conserve_scripts"] = file_exists(
"plugins/conserve/scripts/detect_duplicates.py"
)
# Check archetypes (paradigm detection)
available["archetypes"] = skill_exists("archetypes:architecture-paradigms")
return availableFallback behavior:
- No imbue: Evidence captured inline in report, no TodoWrite proof-of-work
- No conserve: Built-in clean code checks (module has self-contained patterns)
- No conserve scripts: Skip detect_duplicates.py, use grep-based fallback
- No archetypes: Skip paradigm-specific checks, use universal coupling/cohesion
Safety Protocol
- Read-only by default: report only, no modifications
- --apply flag for interactive remediation (like unbloat)
- Never auto-refactor without preview and approval
- Test after each change when applying
- Backup branch when --apply is used
Escalation to Opus
Escalate when:
- Cross-module restructuring (>10 files affected)
- Architectural realignment needed
- Complex algorithm replacement
- Large codebase (>10K lines) deep analysis
Related
- pensive:code-refinement skill: Analysis dimensions and detection patterns
- pensive:code-reviewer agent: Bug-focused review (complementary)
- conserve:unbloat-remediator agent: Dead code removal (complementary)
- /refine-code command: User-facing interface
- /cleanup command: Unified orchestrator (if conserve installed)
Before you install
- Read the whole file first. Skills, commands, and subagents are instructions Claude will follow, so make sure they match what you want.
- Check which tools, scripts, or MCP servers it uses. Local servers and scripts run with your permissions.
- Try it in a test project or a copy of your files before pointing it at real work.
- Pin the version you tested, and review changes before updating.
- Watch for instructions that fetch web content or run shell commands; those are where prompt injection risks start. See our prompt injection guide.
FAQ
What is Code Refiner?
Code Refiner is a subagent for Claude Code and Claude Cowork from the athola/claude-night-market repository on GitHub. Orchestrate code quality refinement: analyze living code for duplication, algorithmic inefficiency, clean code violations, and architectural misfit. Generate concrete refactoring plans with before/after examples. Use PROACTIVELY for: code quality improvement, refactoring sprints, anti-slop remediation PRE-INVOCATION CHECK (parent must verify BEFORE calling): - "Fix this one function"? -> Parent…
How do I install Code Refiner in Claude Code?
Download code-refiner.md from the repository. Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control. Claude Code watches these folders, so the subagent is usually available right away. Ask Claude to use it by name, or @-mention it to make sure it runs.
Can I use Code Refiner in Claude Cowork?
Cowork loads subagents through plugins. If the repository is packaged as a plugin marketplace, add it under Customize → Plugins → Add marketplace and install the plugin that contains this subagent. Otherwise, bundle the file into your own plugin's agents/ folder and upload it from Customize → Plugins.
Is Code Refiner safe to install?
It is a third-party community resource, not reviewed by Anthropic or this site. Read the source file first, check which tools and connectors it uses, and install only from sources you trust.
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