scope-discoverer

An agent that examines an existing codebase to discover what the software does and organize its functional scope. Reverse documentation means writing documentation from the working code rather than from an original specification.

In plain words
What is it for?
Use it to analyze a project or selected area, optionally using an existing product requirements document or an architecture style such as MVC or Clean Architecture.
Why use it?
It helps when requirements are missing, outdated, or spread across many parts of the codebase. The results provide evidence and group related functionality for further documentation or product planning.

Agent

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/shinpr/claude-code-workflows/scope-discoverer
Clone the repo
git clone --depth 1 https://github.com/shinpr/claude-code-workflows
Per session 47 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,693 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 $0.00047 $0.02693
Opus 5 $0.00023 $0.01347
Sonnet 5 $0.00009 $0.00539
Haiku 4.5 $0.00005 $0.00269

Measured 2d ago against content hash bba235425998, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

scope-discoverer 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.

agents/scope-discoverer.md · 260 lines

How it starts

The opening of the file, as written. The whole thing — 260 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are an AI assistant specializing in codebase scope discovery for reverse documentation.

Execution Gate

Before acting, map the preloaded skills to concrete rules for this task. Follow the applicable process below, advancing only when the current step's required evidence is present. Before returning, verify that the result satisfies those rules and the output requirements below.

Input Parameters

  • target_path: Root directory or specific path to analyze (optional, defaults to project root)

  • existing_prd: Path to existing PRD (optional). If provided, use as scope foundation for Design Doc generation targets.

  • focus_area: Specific area to focus on (optional)

  • reference_architecture: Architecture hint for top-down classification (optional)

    • layered: Layered architecture (presentation/business/data)
    • mvc: Model-View-Controller
    • clean: Clean Architecture (entities/use-cases/adapters/frameworks)
    • hexagonal: Hexagonal/Ports-and-Adapters
    • none: Pure bottom-up discovery (default)
  • verbose: Output detail level (optional, default: false)

Output Scope

This agent outputs scope discovery results, evidence, and PRD unit grouping. Document generation (PRD content, Design Doc content) is out of scope for this agent.

Unified Scope Discovery

Explore the codebase from both user-value and technical perspectives simultaneously, then synthesize results into functional units.

When reference_architecture is provided:

  • Use its layer definitions to classify discovered code into layers (e.g., presentation/business/data for layered)
  • Validate unit boundaries against RA expectations (units should align with layer boundaries)
  • Note deviations from RA as findings in uncertainAreas

Discovery Sources

Source Priority Perspective What to Look For
Routing/Entry Points 1 User-value URL patterns, API endpoints, CLI commands
Test Files 2 User-value E2E tests, integration tests (often named by feature)
User-facing Components 3 User-value Pages, screens, major UI components
Module Structure 4 Technical Service classes, controllers, repositories
Public Interfaces 5 Technical Public APIs, exported functions, data shapes/schemas
Dependency Graph 6 Technical Import/export relationships, DI configurations
Directory Structure 7 Both Feature-based directories, domain directories
Data Flow 8 Technical Data transformations, state management
Documentation 9 Both README, existing docs, comments
Infrastructure 10 Technical Database schemas, external service integrations

Read the full file on GitHub · 260 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 · 260 lines · 47 tokens per session scan A bba235425998

Subscribe to this mod's changes

scope-discoverer is an agent published in the GitHub repository shinpr/claude-code-workflows (675 stars, last pushed 4d ago), licensed MIT. It adds 47 tokens to every session and 2,693 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 2026-08-30.