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## Summary Perf report workflow fails on fork PRs because `GITHUB_TOKEN` is read-only for forks, causing "Resource not accessible by integration" on the PR comment step. ## Changes - **What**: Split `ci-perf-report.yaml` into a data-collection workflow + a `workflow_run`-triggered reporter (`pr-perf-report.yaml`), matching the existing `ci-size-data`/`pr-size-report` pattern. Added fork PR permissions guidance to `.github/AGENTS.md`. - **ci-perf-report.yaml**: Removed the `report` job and `pull-requests: write` permission. Added PR metadata (number + base branch) artifact upload. - **pr-perf-report.yaml** (new): Triggered by `workflow_run` on the perf workflow. Downloads metrics + metadata artifacts, generates report, posts PR comment with write permissions from the default-branch context. ## Review Focus - The two-workflow split follows the same pattern as `ci-size-data.yaml` → `pr-size-report.yaml`, which already works for fork PRs. - The `workflow_run` trigger runs in the base repo context per [GitHub Security Lab guidance](https://securitylab.github.com/resources/github-actions-preventing-pwn-requests/), so it safely has write permissions even for fork PRs. - AGENTS.md guidance documents this pattern to prevent recurrence. Fixes the failure seen in https://github.com/Comfy-Org/ComfyUI_frontend/actions/runs/22684230751/job/65763595989?pr=9380 ┆Issue is synchronized with this [Notion page](https://www.notion.so/PR-9382-fix-split-perf-report-workflow-for-fork-PR-support-3196d73d365081b29b35ed354e7789e2) by [Unito](https://www.unito.io)
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PR Review Context
Context for automated PR review system.
Review Scope
This automated review performs comprehensive analysis:
- Architecture and design patterns
- Security vulnerabilities
- Performance implications
- Code quality and maintainability
- Integration concerns
For implementation details, see .claude/commands/comprehensive-pr-review.md.
GitHub Actions: Fork PR Permissions
Fork PRs get a read-only GITHUB_TOKEN — no PR comments, no secret access, no pushing.
Any workflow that needs write access must use the two-workflow split: a pull_request-triggered ci-*.yaml uploads artifacts (including PR metadata), then a workflow_run-triggered pr-*.yaml downloads them and posts comments with write permissions. See ci-size-data → pr-size-report or ci-perf-report → pr-perf-report. Use .github/actions/post-pr-report-comment for the comment step.
Never write PR comments directly from pull_request workflows or use pull_request_target to run untrusted code.