--- title: "Code Simplifier: review, role & definition · Undominated.ai" canonical: https://undominated.ai/agents/anthropic-code-simplifier/ description: "Refines recently changed code for clearer structure and naming while explicitly keeping its behavior and scope intact." --- # Code Simplifier: review, role & definition · Undominated.ai > Refines recently changed code for clearer structure and naming while explicitly keeping its behavior and scope intact. [← Explore all agents](/agents/) CODE MAINTENANCE / anthropics # Code Simplifier Refines recently changed code for clearer structure and naming while explicitly keeping its behavior and scope intact. Use this definition ↓Original source ↗ SOURCE REVIEW Reviewed 2026-09-21 Evidence 4 linked sources Publisher anthropics Licence Apache-2.0 ↗ Revision c447c3207a42 Read what was—and wasn’t—checked ↓ “Simplifies and refines code for clarity, consistency, and maintainability while preserving all functionality. Focuses on recently modified code unless instructed otherwise.” anthropics · upstream description ↗ Our analysis follows below. 01 / THE REASONING ## Why this made the selection. - Limits the default pass to code changed in the current session and explicitly prioritizes behavior preservation. - Explains when simplification becomes harmful: dense one-liners, merged responsibilities, removed useful abstractions and changes made only to reduce line count. - Adds a focused implementation role alongside the catalogue’s existing architecture and review roles. ### A good fit for - A small cleanup pass after implementing a feature or resolving review comments. - Reducing nesting, redundant abstractions and unclear naming in JavaScript or TypeScript code. ### Weigh up before choosing - Its embedded coding preferences target JavaScript, TypeScript and React; they need review against other languages and the project’s own conventions. - Behavior preservation is an instruction, not an executed proof: the definition does not prescribe a concrete regression-test procedure. - It permits proactive changes and has no explicit tool allowlist; the host’s permissions determine what it can modify. The file itself does not install an after-edit hook. - The original chooses the opus model alias; use requires a compatible host model configuration. 02 / THE REVIEW RECORD ## What we actually inspected. Source review has boundaries. A clear record is more useful than a “safe” badge. ### Material inspected - plugins/code-simplifier/agents/code-simplifier.md (complete original definition, including YAML checked for duplicate keys) - plugins/code-simplifier/LICENSE (applicable full licence bytes; definition and licence SHA-256 recorded) - plugins/code-simplifier/.claude-plugin/plugin.json - Current Claude Code subagent documentation (file locations, models and inherited tools) ### Our findings - The original has valid frontmatter and a clear default scope of recently modified code. - The prompt values explicit, understandable code over brevity and retains useful abstractions. - The JS/TS/React preferences and autonomous editing policy are material setup decisions; no test harness or restrictive tools list ships with the file. ### Not established by this review - The agent definition has not been executed or benchmarked. - Host permissions, model behavior and task outcomes were not runtime-tested. The review applies to the material and revision named here. A newer upstream release can change its behavior. 03 / PUT IT TO WORK ## Use the role in your project. Upstream setup instructions ↗ - Download the unchanged code-simplifier.md with its licence and attribution, then inspect the coding preferences and opus model choice. - For project scope, place the working copy at .claude/agents/code-simplifier.md; the documented personal scope is ~/.claude/agents/. - Set host permissions for the intended editing scope, and delegate a bounded pass over the recently modified code. - Review the resulting diff and run the project’s relevant checks before accepting behavior-preserving changes. These checks are your verification step, not a bundled test suite. ### Before you start - Claude Code with a supported model configuration. - A repository with clear project conventions and a bounded set of changed files. ### Compatibility Claude Code ### Repository editing through host permissions - No tools field is declared, so Claude Code inherits the tools available to the subagent. - The body explicitly requests proactive code refinement; it is an editing role, not a read-only reviewer. ### Cost model The definition is reusable under Apache-2.0. Claude Code access and model usage follow the user’s host plan or provider billing. THE COMPLETE REVIEWED DEFINITION ## Read it before you reuse it. Original source bytes, with attribution. Review the host-specific setup notes above. Copy definition ↗ [Download definition + licence ↗](/resources/agents/anthropic-code-simplifier/bundle.zip)[Raw Markdown ↗](/resources/agents/anthropic-code-simplifier/definition.md) --- name: code-simplifier description: Simplifies and refines code for clarity, consistency, and maintainability while preserving all functionality. Focuses on recently modified code unless instructed otherwise. model: opus --- You are an expert code simplification specialist focused on enhancing code clarity, consistency, and maintainability while preserving exact functionality. Your expertise lies in applying project-specific best practices to simplify and improve code without altering its behavior. You prioritize readable, explicit code over overly compact solutions. This is a balance that you have mastered as a result your years as an expert software engineer. You will analyze recently modified code and apply refinements that: 1. **Preserve Functionality**: Never change what the code does - only how it does it. All original features, outputs, and behaviors must remain intact. 2. **Apply Project Standards**: Follow the established coding standards from CLAUDE.md including: - Use ES modules with proper import sorting and extensions - Prefer `function` keyword over arrow functions - Use explicit return type annotations for top-level functions - Follow proper React component patterns with explicit Props types - Use proper error handling patterns (avoid try/catch when possible) - Maintain consistent naming conventions 3. **Enhance Clarity**: Simplify code structure by: - Reducing unnecessary complexity and nesting - Eliminating redundant code and abstractions - Improving readability through clear variable and function names - Consolidating related logic - Removing unnecessary comments that describe obvious code - IMPORTANT: Avoid nested ternary operators - prefer switch statements or if/else chains for multiple conditions - Choose clarity over brevity - explicit code is often better than overly compact code 4. **Maintain Balance**: Avoid over-simplification that could: - Reduce code clarity or maintainability - Create overly clever solutions that are hard to understand - Combine too many concerns into single functions or components - Remove helpful abstractions that improve code organization - Prioritize "fewer lines" over readability (e.g., nested ternaries, dense one-liners) - Make the code harder to debug or extend 5. **Focus Scope**: Only refine code that has been recently modified or touched in the current session, unless explicitly instructed to review a broader scope. Your refinement process: 1. Identify the recently modified code sections 2. Analyze for opportunities to improve elegance and consistency 3. Apply project-specific best practices and coding standards 4. Ensure all functionality remains unchanged 5. Verify the refined code is simpler and more maintainable 6. Document only significant changes that affect understanding You operate autonomously and proactively, refining code immediately after it's written or modified without requiring explicit requests. Your goal is to ensure all code meets the highest standards of elegance and maintainability while preserving its complete functionality. The download contains code-simplifier.md . Keep its filename when placing it in the agent directory described above. By **anthropics**. 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We also recommend that a file or class name and description of purpose be included on the same "printed page" as the copyright notice for easier identification within third-party archives. Copyright [yyyy] [name of copyright owner] Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. 04 / FOLLOW THE EVIDENCE ## The source trail. Our notes are separate from the original resource. Check upstream before adopting a new version. - Complete upstream agent definition ↗ Checked 2026-09-21 https://github.com/anthropics/claude-plugins-official/blob/c447c3207a425bc4e2a0d068435f64b0477ae981/plugins/code-simplifier/agents/code-simplifier.md Supports: summary, upstreamDescription, whySelected, bestFor, limitations, review, access - Applicable upstream licence ↗ Checked 2026-09-21 https://github.com/anthropics/claude-plugins-official/blob/c447c3207a425bc4e2a0d068435f64b0477ae981/plugins/code-simplifier/LICENSE Supports: license, artifact - Claude Code custom subagent configuration ↗ Checked 2026-09-21 https://code.claude.com/docs/en/sub-agents.md Supports: compatibility, install, access, limitations, review - Official code-simplifier plugin manifest ↗ Checked 2026-09-21 https://github.com/anthropics/claude-plugins-official/blob/c447c3207a425bc4e2a0d068435f64b0477ae981/plugins/code-simplifier/.claude-plugin/plugin.json Supports: compatibility, review KEEP COMPARING ## Other approaches to consider. Related by category or shared topics. These are alternatives to inspect, not a measured quality order. [### Code Architect ↗ Turns observed repository conventions into a concrete feature blueprint with file changes, interfaces, trade-offs and an implementation sequence.](/agents/anthropic-code-architect/)[### Code Explorer ↗ Traces an existing feature from entry points through state changes and storage, producing a source-linked map for the next developer.](/agents/anthropic-code-explorer/)[### Function Analyzer ↗ Builds a line-cited account of one function’s invariants, assumptions and callee dependencies before a later security review.](/agents/trailofbits-function-analyzer/) [AI Tools ↗](/tools/)[Skills ↗](/skills/)[Agents ↗](/agents/)[MCP Servers ↗](/mcp-servers/)