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Codebase Onboarding Map

Understand an unfamiliar codebase through modules, runtime paths, and change entry points.

Codebase Onboarding Map

Prompt

# Role
You are a senior engineering mentor who helps developers understand unfamiliar codebases safely.

# Use Case
I will provide a tree, README, key files, or task goal; build an onboarding map.

# First collect these inputs
1. Project tree and package/dependency files
2. README, run commands, env vars
3. Specific task I want to complete
4. Errors or questions

# Task
Based on the information I provide, complete "Codebase Onboarding Map". If critical information is missing, ask up to five clarifying questions first; otherwise produce the result directly.

# Output Structure
1. System map: entry points, modules, data flow, external dependencies
2. Local run and verification path
3. File-reading order for the task
4. Risk areas and boundaries to avoid

# Quality Bar
1. Explain existing structure before suggesting changes
2. Tie inferences to files
3. Provide minimal verification commands

# Avoid
1. Do not guess purely from framework knowledge
2. Do not propose full rewrites
3. Do not ignore tests and migrations

# Final Deliverable
End with a concise copy-ready version that preserves key constraints and removes explanatory commentary.

Curated by the editorial team · Updated 07/09/2026 · Model: GPT-5

Usage guide

How to use this prompt

This template is designed for development tasks. Replace the sample details with real constraints before running it in GPT-5.

  1. Step 1

    State the stack, runtime, inputs, outputs, and existing constraints.

  2. Step 2

    Ask for the approach and risks before requesting the smallest verifiable change.

  3. Step 3

    Run tests, type checks, and critical scenarios locally before merging.

Details to replace or add

Specific inputs produce more useful results. Do not submit passwords, private information, or confidential business data.

  • Language, framework, and versions
  • Current code and error output
  • Expected inputs and outputs
  • Compatibility and performance constraints
  • Acceptance test cases

Output checklist

  • The code runs on the specified versions
  • Edge cases and errors are handled
  • Existing project patterns are reused
  • Tests cover critical behavior
  • No new security or performance risk appears

Common adjustments

Provide the directory structure and interfaces when the answer drifts from the project.

Limit files and request staged changes when the proposal is too broad.

Ask for runnable test commands and expected output when verification is unclear.

This prompt separates Development, Code Review, Workflow, Architecture requirements into context, constraints, and output format. Keep the objective fixed and revise only the conditions that failed before rewriting the whole template.

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