understand

A command that studies an application’s structure, technologies, architecture, dependencies, integrations, and coding patterns.

In plain words
What is it for?
Use it to inspect project structure, find entry points and core modules, understand data and API layers, identify frontend and configuration patterns, and review how testing is organized.
Why use it?
It gives a developer a map of an unfamiliar project before they modify it, reducing the chance of missing important files or conventions.

Command

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 commands/brennercruvinel/ccplugins/understand
Clone the repo
git clone --depth 1 https://github.com/brennercruvinel/CCPlugins
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 561 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 $0.00000 $0.00561
Opus 5 $0.00000 $0.00280
Sonnet 5 $0.00000 $0.00112
Haiku 4.5 $0.00000 $0.00056

Measured 3d ago against content hash 7bb8efbf9470, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

understand 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 3d 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.

commands/understand.md · 88 lines

What it actually says

Understand Project

I'll analyze your entire application to understand its architecture, patterns, and how everything works together.

Phase 1: Project Discovery Using native tools for comprehensive analysis:

  • Glob to map entire project structure
  • Read key files (README, docs, configs)
  • Grep to identify technology patterns
  • Read entry points and main files

I'll discover:

  • Project type and main technologies
  • Architecture patterns (MVC, microservices, etc.)
  • Directory structure and organization
  • Dependencies and external integrations
  • Build and deployment setup

Phase 2: Code Architecture Analysis

  • Entry points: Main files, index files, app initializers
  • Core modules: Business logic organization
  • Data layer: Database, models, repositories
  • API layer: Routes, controllers, endpoints
  • Frontend: Components, views, templates
  • Configuration: Environment setup, constants
  • Testing: Test structure and coverage

Phase 3: Pattern Recognition I'll identify established patterns:

  • Naming conventions for files and functions
  • Code style and formatting rules
  • Error handling approaches
  • Authentication/authorization flow
  • State management strategy
  • Communication patterns between modules

Phase 4: Dependency Mapping

  • Internal dependencies between modules
  • External library usage patterns
  • Service integrations
  • API dependencies
  • Database relationships
  • Asset and resource management

Phase 5: Documentation Synthesis After analysis, I'll provide:

  • Architecture diagram (in text/markdown)
  • Key components and their responsibilities
  • Data flow through the application
  • Important patterns to follow
  • Tech stack summary
  • Development workflow

Integration Points: I'll identify how components interact:

  • API endpoints and their consumers
  • Database queries and their callers
  • Event systems and listeners
  • Shared utilities and helpers
  • Cross-cutting concerns (logging, auth)

Output Format:

PROJECT OVERVIEW
├── Architecture: [Type]
├── Main Technologies: [List]
├── Key Patterns: [List]
└── Entry Point: [File]

COMPONENT MAP
├── Frontend
│   └── [Structure]
├── Backend
│   └── [Structure]
├── Database
│   └── [Schema approach]
└── Tests
    └── [Test strategy]

KEY INSIGHTS
- [Important finding 1]
- [Important finding 2]
- [Unique patterns]

When the analysis is large, I'll create a todo list to explore specific areas in detail.

This gives you a complete mental model of how your application works.

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. 3d ago First seen · 88 lines · 0 tokens per session scan A 7bb8efbf9470

Subscribe to this mod's changes

understand is a command published in the GitHub repository brennercruvinel/CCPlugins (2,780 stars, last pushed 2mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 561 tokens. 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.