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Implementation plan prompt file (Copilot)

A Copilot prompt file (/plan-feature) that researches the codebase and writes a step-by-step plan before coding.

GitHub CopilotAgent workflows

Copy plan-feature.prompt.md

How to use

Save this as .github/prompts/plan-feature.prompt.md in your repository root, commit it, and your agent will pick it up automatically. Edit the commands to match your project.

Note: Review and test before use. Provided as is, without warranty. See Terms.

---
description: Research the codebase and write an implementation plan for a feature
agent: plan
argument-hint: feature description
---

Create an implementation plan for: ${input:feature:Describe the feature or change}

Do not write or edit code in this step.

1. Restate the goal and acceptance criteria in a few bullets. List open questions first if requirements are ambiguous.
2. Research: find the relevant modules, similar existing features to copy patterns from, data models, and tests. Cite the files.
3. Plan:
   - **Approach** in a paragraph, plus one alternative and why you didn't choose it.
   - **Steps**, numbered, each small enough for one commit, naming files to create/change.
   - **Data changes:** schema/migrations, backfills, config or env vars.
   - **Tests** to add per step (unit, integration, e2e).
   - **Risks:** breaking changes, performance, security, rollout (feature flag?).
   - **Done when:** the commands that must pass and what to check manually.
4. Estimate size (S/M/L) and flag anything that should be a separate PR.

Save nothing; output the plan in chat for my review.