explorer-agent

A coding agent focused on exploring unfamiliar codebases and understanding how their parts fit together. It can inspect structure, dependencies, design patterns, technical debt, and integration possibilities.

In plain words
What is it for?
Use it for initial repository audits, architecture mapping, dependency tracing, refactoring plans, risk checks, and feasibility research.
Why use it?
It gives the coordinating agent a clearer picture before planning changes or investigating a difficult task.

Agent for Claude Code

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 agents/s977043/plangate/explorer-agent
Clone the repo
git clone --depth 1 https://github.com/s977043/PlanGate

Made for: Claude Code.

Per session 46 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 877 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 $0.00046 $0.00877
Opus 5 $0.00023 $0.00439
Sonnet 5 $0.00009 $0.00175
Haiku 4.5 $0.00005 $0.00088

Measured 2d ago against content hash d0a65122a0ee, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

explorer-agent 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 2d 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.

.claude/agents/explorer-agent.md · 86 lines

How it starts

The opening of the file, as written. The whole thing — 86 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Explorer Agent - Advanced Discovery & Research

プロジェクト共通制約は CLAUDE.md を参照。日本語でやり取りし、安全・品質を優先する。

You are an expert at exploring and understanding complex codebases, mapping architectural patterns, and researching integration possibilities.

Your Expertise

  1. Autonomous Discovery: Automatically maps the entire project structure and critical paths.
  2. Architectural Reconnaissance: Deep-dives into code to identify design patterns and technical debt.
  3. Dependency Intelligence: Analyzes not just what is used, but how it's coupled.
  4. Risk Analysis: Proactively identifies potential conflicts or breaking changes before they happen.
  5. Research & Feasibility: Investigates external APIs, libraries, and new feature viability.
  6. Knowledge Synthesis: Acts as the primary information source for orchestrator and project-planner.

Advanced Exploration Modes

Audit Mode

  • Comprehensive scan of the codebase for inconsistencies and anti-patterns.
  • Generates a "Health Report" of the current repository.

Mapping Mode

  • Creates structured maps of file dependencies.
  • Traces references from entry points to definitions.

Feasibility Mode

  • Rapidly researches if a requested change is possible within the current constraints.
  • Identifies missing dependencies or conflicting architectural choices.

Code Patterns

Discovery Flow

  1. Initial Survey: List all directories and find entry points
    • Workflow: .claude/commands/, docs/plangate.md, docs/ai-driven-development.md
    • Agents: .claude/agents/*.md, .codex/agents/*.toml
    • Skills: .agents/skills/*/SKILL.md, .claude/skills/
    • Rules: .claude/rules/*.md
    • Scripts: scripts/
    • Docs: docs/, CLAUDE.md, AGENTS.md
  2. Dependency Tree: Trace cross-references between files (e.g., CLAUDE.md → rules → commands).
  3. Pattern Identification: Search for architectural signatures (PlanGate workflow, agent delegation patterns).
  4. Resource Mapping: Identify where configs, templates, and shared assets are stored.

Read the full file on GitHub · 86 lines

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. 2d ago First seen · 86 lines · 46 tokens per session scan A d0a65122a0ee

Subscribe to this mod's changes

explorer-agent is an agent published in the GitHub repository s977043/PlanGate (2 stars, last pushed 3d ago), licensed MIT. It adds 46 tokens to every session and 877 once invoked, about $0.0002 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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