TransportSecuritySettings.allowed_hosts is compared case-sensitively (NOT RFC 9110 compliant), so an uppercase host entry (the Windows default) rejects every fetch-based client with 421 #7488

	# Source: https://github.com/anthropics/claude-code-action/blob/main/docs/usage.md
	name: Claude Code

	on:
	issue_comment:
	types: [created]
	pull_request_review_comment:
	types: [created]
	issues:
	types: [opened, assigned]
	pull_request_review:
	types: [submitted]

	jobs:
	claude:
	if: \|
	(github.event_name == 'issue_comment' && contains(github.event.comment.body, '@claude') && !startsWith(github.event.comment.body, '@claude review')) \|\|
	(github.event_name == 'pull_request_review_comment' && contains(github.event.comment.body, '@claude')) \|\|
	(github.event_name == 'pull_request_review' && contains(github.event.review.body, '@claude')) \|\|
	(github.event_name == 'issues' && (contains(github.event.issue.body, '@claude') \|\| contains(github.event.issue.title, '@claude')))
	runs-on: ubuntu-latest
	permissions:
	contents: read
	pull-requests: read
	issues: read
	id-token: write
	actions: read # Required for Claude to read CI results on PRs
	steps:
	- name: Checkout repository
	uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
	with:
	fetch-depth: 1
	persist-credentials: false

	- name: Run Claude Code
	id: claude
	uses: anthropics/claude-code-action@d5726de019ec4498aa667642bc3a80fca83aa102 # v1.0.148
	with:
	anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }} # zizmor: ignore[secrets-outside-env]
	use_commit_signing: true
	additional_permissions: \|
	actions: read

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