serena-refactor

serena-refactor is a skill for Claude Code, Codex from anilcancakir/claude-code-plugins. It costs 55 tokens per session (347 once invoked), scanned A, original, MIT.

A code-refactoring guide for safely renaming functions or other symbols and replacing function implementations across a codebase.

In plain words
What is it for?
Use it to rename symbols across files, change a function's implementation while keeping its inputs and outputs, review affected code, and run tests afterward.
Why use it?
It reduces missed references, broken imports, and accidental changes caused by editing matching text by hand.

Skill for Claude CodeCodex

Part of the serena-integration plugin — 3 skills shipped together

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 skills/anilcancakir/claude-code-plugins/serena-refactor
Any agent
npx skills add anilcancakir/claude-code-plugins --skill serena-refactor
Clone the repo
git clone --depth 1 https://github.com/anilcancakir/claude-code-plugins

Made for: Claude Code, Codex.

Or install serena-integration, the plugin that ships this one along with the rest of its 3 skills.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for serena-refactor

README.md
[![agentmods](https://agentmods.dev/badge/skills/anilcancakir/claude-code-plugins/serena-refactor.svg)](https://agentmods.dev/skills/anilcancakir/claude-code-plugins/serena-refactor)
Your own site
<a href="https://agentmods.dev/skills/anilcancakir/claude-code-plugins/serena-refactor"><img src="https://agentmods.dev/badge/skills/anilcancakir/claude-code-plugins/serena-refactor.svg" alt="Measured on agentmods" height="20"></a>
Per session 55 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 347 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 $0.00055 $0.00347
Opus 5 $0.00028 $0.00173
Sonnet 5 $0.00011 $0.00069
Haiku 4.5 $0.00006 $0.00035

Measured 4d ago against content hash 2b8481b3f693, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

serena-refactor 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 4d 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.

serena-integration/skills/serena-refactor/SKILL.md · 69 lines

What it actually says

Serena Safe Refactoring

Cross-Codebase Rename

rename_symbol(old_name="calcTax", new_name="calculate_tax")
  • Updates ALL references automatically
  • Works across files
  • Handles imports/exports

Replace Function Body

replace_symbol_body(symbol_name="process_payment", new_body="...")
  • Preserves function signature
  • Safer than text replacement
  • Maintains formatting

Pre-Refactoring Checklist

  1. Check impact:

    find_referencing_symbols("function_to_change")
    

    Review all affected locations before changing.

  2. Verify tests exist:

    find_symbol("test_function_to_change")
    
  3. Run tests after:

    pytest tests/test_module.py -v
    

Common Patterns

Rename Function

find_referencing_symbols("old_name")  # Check impact
rename_symbol(old_name="old_name", new_name="new_name")
# Run tests

Replace Implementation

find_symbol("function_name", include_body=true)  # See current
replace_symbol_body("function_name", new_body="...")
# Run tests

Safety Notes

  • Always check references before renaming
  • Run tests after each refactoring step
  • Document patterns in Serena memory for future reference
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. 4d ago First seen · 69 lines · 55 tokens per session scan A 2b8481b3f693

Subscribe to this mod's changes

serena-refactor is a skill published in the GitHub repository anilcancakir/claude-code-plugins (6 stars, last pushed 7mo ago), licensed MIT. It adds 55 tokens to every session and 347 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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