scripts: pace live-acceptance /mcp POSTs, add retry and JSON safety

[Trailgenic]

Motivation

• The live-acceptance harness was tripping the production Cloudflare rate limit for POST /mcp when run from CI, which returned an HTML block page and caused a raw JSON.parse SyntaxError in the harness.
• The harness needs to avoid firing MCP POST requests faster than the production limit while still keeping assertions and behavior unchanged.
• Improve error visibility so blocked or non-JSON responses surface an informative error instead of crashing with an opaque parse exception.

Description

• Modified only scripts/live-acceptance.mjs to add a paced POST helper that spaces POST /mcp requests by 1100ms via mcpPostFetch, leaving GET discovery routes unpaced.
• Hardened postMcp to check response.ok and the content-type before calling JSON.parse, and to include the HTTP status plus the first 200 characters of the body in error messages for non-JSON or blocked responses.
• Added a one-time retry behavior in postMcp: on HTTP 429 or an HTML block response the harness waits 11000ms and retries the request once before failing.
• Kept all existing assertions and test logic intact; only the POST pacing, response validation, and retry handling were introduced.

Testing

• Ran node --check scripts/live-acceptance.mjs and it passed.
• Ran npm ci and then npm run lint, npm test, npm run test:workers, npm run validate:json, and npm run validate:registry, and all completed successfully.
• Local environment could not confirm GitHub Actions PR CI from this checkout, so deploy-time live acceptance can only be fully re-verified after merge via the deploy workflow.
• No changes were made to the Worker, rate limits, datasets, or assertions as part of this change.

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Codex Task

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Project	Deployment	Actions	Updated (UTC)
workers	Building	Preview	Jul 14, 2026 5:47am