feat: Register "What-if Analysis" community extension by DevAbdullah90 · Pull Request #2182 · github/spec-kit

DevAbdullah90 · 2026-04-11T22:08:57Z

This pull request registers the "What-if Analysis" extension in the community catalog.

View Migration Details

Following maintainer feedback, the implementation has been moved to a standalone repository to comply with community hosting standards.

Standalone Repository: https://github.com/DevAbdullah90/spec-kit-whatif

Changes:

Removed local code: Deleted the internal implementation from extensions/whatif.
Alphabetical Catalog: Added whatif to extensions/catalog.community.json in the correct alphabetical order (before worktree).
README Update: Added "What-if Analysis" to the community extensions table in the root README.md.

All script paths in the standalone command have been adjusted to work correctly when the extension is installed via specify extension add.

mnriem

Please deliver this as an extension as per https://github.com/github/spec-kit/tree/main/extensions

DevAbdullah90 · 2026-04-13T12:41:33Z

I have refactored the implementation to deliver the "what-if" analysis as a standalone extension rather than a core feature.

Changes in this PR:

Moved to Extension: All "what-if" logic has been moved to a new directory: extensions/whatif/.
Core Reversion: Reverted changes to core files (README.md, src/specify_cli/__init__.py, and agent integrations) to keep the core codebase clean and modular.
Extension Manifest: Added extensions/whatif/extension.yml defining the speckit.whatif.analyze command.
Modular Design: The analysis logic is now contained in extensions/whatif/commands/analyze.md, and I've added a dedicated README.md for the extension.

The feature is now fully optional and can be added via specify extension add whatif. Ready for another look!

mnriem

Community extensions are hosted in your own GitHub repository. Once you have it there you we can include it in the community catalog and list it on the README.

If you need more information let me know.

Thanks!

DevAbdullah90 · 2026-04-13T15:52:14Z

Hi @mnriem,

I have completed the migration of the What-if Analysis extension to a standalone repository as you suggested.

Changes in this PR:

Extracted Extension: Moved all "what-if" logic to its own repository: DevAbdullah90/spec-kit-whatif
Catalog Registration: Added the extension to extensions/catalog.community.json pointing to the new host.
README Update: Added "What-if Analysis" to the community extensions table in the root README.md.
Cleanup: Removed the local extensions/whatif directory from this repository.

I've also updated the command metadata in the standalone repo to ensure script paths work correctly when installed into a .specify project structure.

Please let me know if there are any further adjustments needed. Thanks!

Copilot

Pull request overview

This PR publishes the “What-if Analysis” community extension by adding it to the community extension catalog and listing it in the README’s Community Extensions table.

Changes:

Add “What-if Analysis” to extensions/catalog.community.json.
Add “What-if Analysis” to the Community Extensions table in README.md.

Show a summary per file

File	Description
README.md	Adds the new extension to the Community Extensions table.
extensions/catalog.community.json	Registers the new “whatif” extension in the community catalog.

Copilot's findings

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Comments suppressed due to low confidence (2)

extensions/catalog.community.json:1922

The new extension entry is missing download_url, which is required for installing extensions from the catalog. Without it, specify extension add whatif will fail with “has no download URL”. Add a HTTPS ZIP download_url (typically a GitHub release asset URL) to make the catalog entry installable.

    "whatif": {
      "name": "What-if Analysis",
      "id": "whatif",
      "description": "Preview the downstream impact (complexity, effort, tasks, risks) of requirement changes before committing to them.",
      "author": "DevAbdullah90",
      "version": "1.0.0",
      "repository": "https://github.com/DevAbdullah90/spec-kit-whatif",
      "homepage": "https://github.com/DevAbdullah90/spec-kit-whatif",
      "documentation": "https://github.com/DevAbdullah90/spec-kit-whatif/blob/main/README.md",
      "license": "MIT",

extensions/catalog.community.json:1916

When adding a new extension to extensions/catalog.community.json, the Extension Publishing Guide requires bumping the top-level updated_at to the current time. This PR adds a new entry but leaves the catalog updated_at unchanged, so consumers can’t rely on it for freshness.

    "whatif": {
      "name": "What-if Analysis",
      "id": "whatif",
      "description": "Preview the downstream impact (complexity, effort, tasks, risks) of requirement changes before committing to them.",

Files reviewed: 2/2 changed files
Comments generated: 2

extensions/catalog.community.json

README.md

Copilot

Pull request overview

Adds the new “What-if Analysis” community extension to Spec Kit’s extension discovery surfaces (community catalog + README listing) so users can find/install it and see it documented alongside other extensions.

Changes:

Added a whatif entry to extensions/catalog.community.json.
Added a “What-if Analysis” row to the community extensions table in README.md.

Show a summary per file

File	Description
extensions/catalog.community.json	Registers the `whatif` extension in the community catalog (metadata, requirements, tags).
README.md	Documents the new extension in the community extensions list.

Copilot's findings

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Files reviewed: 2/2 changed files
Comments generated: 3

Copilot · 2026-04-13T16:34:34Z

extensions/catalog.community.json

+      "stars": 0,
+      "created_at": "2026-04-13T00:00:00Z",
+      "updated_at": "2026-04-13T00:00:00Z"


Since this file was edited to add a new extension entry, the top-level updated_at field should be bumped to the current timestamp as required by the Extension Publishing Guide; otherwise the catalog metadata becomes stale.

Copilot · 2026-04-13T16:34:35Z

README.md

 | Verify Tasks Extension | Detect phantom completions: tasks marked [X] in tasks.md with no real implementation | `code` | Read-only | [spec-kit-verify-tasks](https://github.com/datastone-inc/spec-kit-verify-tasks) |
+| What-if Analysis | Preview the downstream impact (complexity, effort, tasks, risks) of requirement changes before committing to them | `visibility` | Read-only | [spec-kit-whatif](https://github.com/DevAbdullah90/spec-kit-whatif) |
 | Worktree Isolation | Spawn isolated git worktrees for parallel feature development without checkout switching | `process` | Read+Write | [spec-kit-worktree](https://github.com/Quratulain-bilal/spec-kit-worktree) |


The PR description/title claim this PR "implements" the new /speckit.whatif command and template generation, but the changes shown here only add an extension catalog entry + README row. If the implementation lives in the external extension repository, please adjust the PR title/description to reflect that this PR is publishing/registering the extension in the community catalog (and link the implementation repo/tag).

Copilot · 2026-04-13T16:34:35Z

extensions/catalog.community.json

+      "id": "whatif",
+      "description": "Preview the downstream impact (complexity, effort, tasks, risks) of requirement changes before committing to them.",
+      "author": "DevAbdullah90",
+      "version": "1.0.0",


This new catalog entry is missing download_url. The CLI requires download_url for any installable extension and will raise Extension '<id>' has no download URL when attempting to add it. Add an HTTPS download_url (typically the GitHub tag ZIP for v1.0.0).

Suggested change

"version": "1.0.0",

"version": "1.0.0",

"download_url": "https://github.com/DevAbdullah90/spec-kit-whatif/archive/refs/tags/v1.0.0.zip",

mnriem

Please address Copilot feedback

feat: implement read-only what-if analysis command

7918b04

DevAbdullah90 requested a review from mnriem as a code owner April 11, 2026 22:09

chore: polish what-if analysis (Claude hints + optional tasks)

434a4e9

mnriem requested changes Apr 13, 2026

View reviewed changes

mnriem self-assigned this Apr 13, 2026

refactor: deliver what-if analysis as a standalone extension

b3118bc

mnriem self-requested a review April 13, 2026 14:15

mnriem requested changes Apr 13, 2026

View reviewed changes

Move What-if extension to standalone repo and update community catalog

107c2e2

mnriem requested a review from Copilot April 13, 2026 16:13

Copilot started reviewing on behalf of mnriem April 13, 2026 16:14 View session

Copilot AI reviewed Apr 13, 2026

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extensions/catalog.community.json Outdated Show resolved Hide resolved

README.md Show resolved Hide resolved

Fix: Reorder whatif extension alphabetically in community catalog

0e20ac2

mnriem requested a review from Copilot April 13, 2026 16:31

Copilot started reviewing on behalf of mnriem April 13, 2026 16:32 View session

Copilot AI reviewed Apr 13, 2026

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DevAbdullah90 changed the title ~~feat: implement read-only what-if analysis command~~ feat: Register "What-if Analysis" community extension Apr 13, 2026

mnriem self-requested a review April 13, 2026 16:36

mnriem requested changes Apr 13, 2026

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feat: Register "What-if Analysis" community extension#2182

feat: Register "What-if Analysis" community extension#2182
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DevAbdullah90:feat/what-if-analysis

DevAbdullah90 commented Apr 11, 2026 •

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	"version": "1.0.0",
	"version": "1.0.0",
	"download_url": "https://github.com/DevAbdullah90/spec-kit-whatif/archive/refs/tags/v1.0.0.zip",

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DevAbdullah90 commented Apr 13, 2026

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DevAbdullah90 commented Apr 11, 2026 •

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