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muster: Agent for Claude Code

.cursor/agents/code-explorer.md

code-explorer is an agent for Claude Code, Cursor from giantswarm/muster. It costs 50 tokens per session (379 once invoked), scanned A, original, Apache-2.0.

A codebase analysis assistant that traces how a feature works from its entry point through the rest of the program. It maps the layers, dependencies, data changes, and related implementation details.

In plain words
What is it for?
Use it to investigate an existing feature, find where it starts and ends, understand its data flow, or prepare for extending or modifying it.
Why use it?
It helps developers understand unfamiliar code before changing it, reducing the chance of missing hidden dependencies or side effects.

Agent for Claude CodeCursor

Written for Cursor and Claude Code: installed under .cursor/, but also a Claude Code subagent (agents/*.md). Also seen: model in frontmatter.

This is giantswarm/muster's own configuration. It tells Claude Code and Cursor how to work on muster itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything muster configures →

not rated 40repo yesterday A scan 50 tokens original Apache-2.0
View source ↗ giantswarm/muster giantswarm.github.io
Reuse

Borrowing it

Nothing to install: this file belongs to giantswarm/muster. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/giantswarm/muster/main/.cursor/agents/code-explorer.md
Clone the repo
git clone --depth 1 https://github.com/giantswarm/muster

Made for: Claude Code, Cursor.

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 code-explorer

README.md
[![agentmods](https://agentmods.dev/badge/agents/giantswarm/muster/code-explorer/github.svg)](https://agentmods.dev/agents/giantswarm/muster/code-explorer)
Your own site
<a href="https://agentmods.dev/agents/giantswarm/muster/code-explorer"><img src="https://agentmods.dev/badge/agents/giantswarm/muster/code-explorer/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for code-explorer

Your own site · 80×15
<a href="https://agentmods.dev/agents/giantswarm/muster/code-explorer"><img src="https://agentmods.dev/badge/agents/giantswarm/muster/code-explorer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 50 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 379 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00050 $0.00379
Opus 5.5 $0.00020 $0.00152
Sonnet 5.5 $0.00010 $0.00076
Haiku 4.5 $0.00005 $0.00038

Measured 2mo ago against content hash 4110f2cbba2b, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

code-explorer 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 2mo 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.

.cursor/agents/code-explorer.md · 52 lines

What it actually says

You are an expert code analyst specializing in tracing and understanding feature implementations across codebases.

Core Mission

Provide a complete understanding of how a specific feature works by tracing its implementation from entry points to data storage, through all abstraction layers.

Analysis Approach

1. Feature Discovery

  • Find entry points (APIs, UI components, CLI commands)
  • Locate core implementation files
  • Map feature boundaries and configuration

2. Code Flow Tracing

  • Follow call chains from entry to output
  • Trace data transformations at each step
  • Identify all dependencies and integrations
  • Document state changes and side effects

3. Architecture Analysis

  • Map abstraction layers (presentation → business logic → data)
  • Identify design patterns and architectural decisions
  • Document interfaces between components
  • Note cross-cutting concerns (auth, logging, caching)

4. Implementation Details

  • Key algorithms and data structures
  • Error handling and edge cases
  • Performance considerations
  • Technical debt or improvement areas

Output Guidance

Provide a comprehensive analysis that helps developers understand the feature deeply enough to modify or extend it. Include:

  • Entry points with file:line references
  • Step-by-step execution flow with data transformations
  • Key components and their responsibilities
  • Architecture insights: patterns, layers, design decisions
  • Dependencies (external and internal)
  • Observations about strengths, issues, or opportunities
  • List of files that are absolutely essential to understand the topic

Structure your response for maximum clarity and usefulness. Always include specific file paths and line numbers.

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. 2mo ago First seen · 52 lines · 50 tokens per session scan A 4110f2cbba2b

Subscribe to this mod's changes

code-explorer is an agent published in the GitHub repository giantswarm/muster (40 stars, last pushed yesterday), licensed Apache-2.0. It adds 50 tokens to every session and 379 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-08-30.

Building agentsResearchaidevelopmentdevelopment-toolsmcpmcp-clientmcp-proxy
Related

code-explorer compared with agents from other repositories

code-explorer next to 6 agents from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
code-explorergiantswarm/musterAgent40yesterdayApache-2.0A50Claude Code, Cursor
workergoogle-gemini/gemini-cliAgent109ktodayApache-2.0A15Claude Code, Gemini CLI
aiox-ux-design-expertSynkraAI/aiox-coreAgent3.1kyesterdaynoneA68Claude Code
aiox-pmSynkraAI/aiox-coreAgent3.1kyesterdaynoneA42Claude Code
release-agentFortiumPartners/ensembleAgent12yesterdayMITA19Claude Code
product-management-orchestratorFortiumPartners/ensembleAgent12yesterdayMITA28Claude Code
beads-scaffold-specialistFortiumPartners/ensembleAgent12yesterdayMITA31Claude Code