Schema | crux-mcp

crux-mcp

Describes the environment variables required to run the server.

Name	Required	Description	Default
`CRUX_API_KEY`	Yes	Your Google Chrome UX Report API key.

Features and capabilities supported by this server

Capability	Details
`tools`	{ "listChanged": false }
`prompts`	{ "listChanged": false }
`resources`	{ "subscribe": false, "listChanged": false }
`experimental`	{}

Functions exposed to the LLM to take actions

Name	Description
crux_recordA	Current p75 Core Web Vitals for an origin or a single URL. Pass EITHER origin (e.g. https://www.betterpic.io — covers the whole site) OR url (one page). form_factor is PHONE, DESKTOP, TABLET or ALL. Returns each metric's p75 with a good / needs-improvement / poor assessment, plus an overall core_web_vitals_pass. Set raw=true for the untouched API response.
crux_historyA	Weekly Core Web Vitals trend, up to 25 points, for charting or regression checks. Same origin / url / form_factor rules as crux_record. Pass metric to return just one series, e.g. largest_contentful_paint, interaction_to_next_paint, cumulative_layout_shift, first_contentful_paint, experimental_time_to_first_byte.
crux_compareA	Compare Core Web Vitals across several origins — yours against competitors. origins is a comma-separated list, e.g. "https://www.betterpic.io,https://www.aragon.ai,https://www.headshotpro.com". Returns one row per origin with the three Core Web Vitals and whether it passes. Origins with no CrUX record are reported rather than dropped silently.

Interactive templates invoked by user choice

Name	Description
No prompts

Contextual data attached and managed by the client

Name	Description
No resources

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