Calibre MCP
Calibre's hosted, read-only MCP server that gives coding agents a site's RUM, CrUX and synthetic performance data to find and fix slow pages.
Tags
Description
Launched 2026-11-03. Add https://calibreapp.com/mcp as a remote server and sign in with OAuth, choosing one organisation per connection. Tools include list_sites, get_site_overview, list_pages, get_rum_metrics, get_ux_rating, get_element_attribution (elements, handlers and scripts behind poor LCP, CLS and INP), get_crux_metrics, get_synthetic_metrics, get_snapshot, get_test_audits and compare_performance. Read-only: it can't run tests, mark deploys or change Sites; the one exception is send_feedback, which sends a note to Calibre. Sees only the Sites in your Teams; 60 requests a minute per connection; admins can switch it off for the organisation. Calibre warns that answers include text from monitored websites and should be treated as untrusted input. Included on every plan (paid plans from $75/month, 15-day free trial).
Agent access
Related
- Chrome DevTools MCP: Lets coding agents control and inspect a live Chrome browser via MCP (or CLI): automation, debugging, performance traces and Lighthouse audits.
- Sentry MCP: Sentry's remote MCP server for coding agents, focused on developer debugging workflows over the Sentry API.
Sources
- https://calibreapp.com/changelog/archive/2026/11-mcp-server
- https://calibreapp.com/docs/automation/mcp
- https://calibreapp.com/pricing
Machine-readable
- JSON
- Markdown
- Source file on GitHub (edit via pull request)