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+# Manual API Changelog Generation
+
+This workflow allows you to generate API changelogs by comparing any two versions of the ComfyUI Frontend package.
+
+## Usage
+
+### Via GitHub Actions UI
+
+1. Go to **Actions** tab in the repository
+2. Select **Manual API Changelog Generation** from the workflows list
+3. Click **Run workflow** button
+4. Fill in the inputs:
+   - **Previous version**: The earlier version (e.g., `1.29.0` or `v1.29.0`)
+   - **Current version**: The later version (e.g., `1.30.2` or `v1.30.2`)
+   - **Create PR**: Check this to automatically create a pull request with the changelog
+
+### Via GitHub CLI
+
+```bash
+# Basic usage - just generate changelog
+gh workflow run manual-api-changelog.yaml \
+  -f from_version=1.29.0 \
+  -f to_version=1.30.2 \
+  -f create_pr=false
+
+# Generate changelog and create PR
+gh workflow run manual-api-changelog.yaml \
+  -f from_version=1.29.0 \
+  -f to_version=1.30.2 \
+  -f create_pr=true
+```
+
+## What It Does
+
+1. **Validates Inputs**: Checks that version formats are valid (X.Y.Z) and tags exist
+2. **Builds Both Versions**: Checks out each version tag, installs dependencies, and builds TypeScript types
+3. **Generates Snapshots**: Creates structured JSON snapshots of the public API surface for each version
+4. **Compares APIs**: Analyzes differences and categorizes as:
+   - ⚠️ **Breaking changes** (removals, signature changes)
+   - ✨ **Additions** (new interfaces, methods, properties)
+   - 🔄 **Modifications** (non-breaking changes)
+5. **Uploads Artifact**: Saves the changelog and snapshots as a workflow artifact (90-day retention)
+6. **Creates PR** (optional): Generates a draft PR to update `docs/API-CHANGELOG.md`
+
+## Output
+
+### Workflow Artifacts
+
+Every run produces an artifact containing:
+- `CHANGELOG-{from}-to-{to}.md` - Human-readable changelog
+- `from.json` - API snapshot of the earlier version
+- `to.json` - API snapshot of the later version
+
+**Retention**: 90 days
+
+### Pull Request (Optional)
+
+If `create_pr` is enabled and changes are detected:
+- Creates a draft PR with title: `[docs] API Changelog: v{from} → v{to}`
+- Updates `docs/API-CHANGELOG.md` with the new changelog entry
+- Includes detailed metadata and review instructions
+- Labeled with `documentation`
+
+## Example Changelog Output
+
+```markdown
+## v1.30.2 (2025-11-04)
+
+Comparing v1.29.0 → v1.30.2. This changelog documents changes to the public API surface.
+
+### ✨ Additions
+
+**Type Aliases**
+- `WorkflowId`
+
+**Interfaces**
+- `ExtensionMetadata`
+  - Members: `id`, `name`, `version`, `description`
+
+### 🔄 Modifications
+
+> **Note**: Some modifications may be breaking changes.
+
+**Interfaces**
+- `ComfyApi`
+  - ✨ Added member: `queuePromptAsync`
+  - ✨ Added member: `cancelPrompt`
+  - ⚠️ **Breaking**: Removed member: `queuePrompt`
+
+**Enums**
+- `NodeStatus`
+  - ✨ Added enum value: `ERROR`
+  - ✨ Added enum value: `COMPLETED`
+```
+
+## Use Cases
+
+### 1. Generate Changelog for Missed Releases
+
+If the automatic workflow failed or was skipped for a release:
+
+```bash
+gh workflow run manual-api-changelog.yaml \
+  -f from_version=1.28.0 \
+  -f to_version=1.29.0 \
+  -f create_pr=true
+```
+
+### 2. Compare Non-Adjacent Versions
+
+To see cumulative changes across multiple releases:
+
+```bash
+gh workflow run manual-api-changelog.yaml \
+  -f from_version=1.25.0 \
+  -f to_version=1.30.2 \
+  -f create_pr=false
+```
+
+### 3. Test Upcoming Changes
+
+Compare current `main` branch against the latest release (requires creating a temporary tag):
+
+```bash
+# Create temporary tag for current main
+git tag v1.31.0-preview
+git push origin v1.31.0-preview
+
+# Run comparison
+gh workflow run manual-api-changelog.yaml \
+  -f from_version=1.30.2 \
+  -f to_version=1.31.0-preview \
+  -f create_pr=false
+
+# Clean up temporary tag
+git tag -d v1.31.0-preview
+git push origin :refs/tags/v1.31.0-preview
+```
+
+### 4. Audit Historical Changes
+
+Generate changelogs for documentation purposes:
+
+```bash
+# Compare multiple version pairs
+for from in 1.26.0 1.27.0 1.28.0 1.29.0; do
+  to=$(echo "$from" | awk -F. '{print $1"."$2+1".0"}')
+  gh workflow run manual-api-changelog.yaml \
+    -f from_version=$from \
+    -f to_version=$to \
+    -f create_pr=false
+done
+```
+
+## Validation
+
+The workflow validates:
+- ✅ Version format matches semantic versioning (X.Y.Z)
+- ✅ Both version tags exist in the repository
+- ✅ Tags reference valid commits with buildable code
+
+If validation fails, the workflow exits early with a clear error message.
+
+## Limitations
+
+- **Tag requirement**: Both versions must have corresponding `vX.Y.Z` git tags
+- **Build requirement**: Both versions must have functional build processes
+- **Type files**: Requires `dist/index.d.ts` to exist after building
+- **Scripts**: Requires `scripts/snapshot-api.js` and `scripts/compare-api-snapshots.js` to be present
+
+## Related Workflows
+
+- **[Release API Changelogs](.github/workflows/release-api-changelogs.yaml)**: Automatic changelog generation triggered by NPM releases
+- **[Release NPM Types](.github/workflows/release-npm-types.yaml)**: Publishes type definitions and triggers automatic changelog
+
+## Troubleshooting
+
+### "Tag does not exist" error
+
+Ensure the version exists as a git tag:
+
+```bash
+git tag -l 'v*' | grep 1.29.0
+```
+
+If missing, the version may not have been released yet.
+
+### "Build failed" error
+
+Check that the version can be built successfully:
+
+```bash
+git checkout v1.29.0
+pnpm install
+pnpm build:types
+```
+
+### No changes detected
+
+If the workflow reports no changes but you expect some:
+1. Check the artifact snapshots to verify they're different
+2. Ensure you're comparing the correct versions
+3. Review the comparison script logic in `scripts/compare-api-snapshots.js`
+
+### PR not created
+
+PR creation requires:
+- `create_pr` input set to `true`
+- Significant changes detected (more than just headers)
+- `PR_GH_TOKEN` secret configured with appropriate permissions
+
+## Security
+
+- **Permissions**: Workflow requires `contents: write` and `pull-requests: write`
+- **Token**: Uses `secrets.PR_GH_TOKEN` for PR creation
+- **Isolation**: Each workflow run uses a unique concurrency group
+- **Artifacts**: Retained for 90 days, accessible to repository collaborators
+
+## Monitoring
+
+View workflow runs:
+```bash
+gh run list --workflow=manual-api-changelog.yaml
+```
+
+View specific run details:
+```bash
+gh run view <run-id>
+```
+
+Download artifacts:
+```bash
+gh run download <run-id>
+```