Chromate MCP
Server Configuration
Describes the environment variables required to run the server.
| Name | Required | Description | Default |
|---|---|---|---|
| CHROMATE_GRID_STEP | No | Screenshot grid spacing. | 100 |
| CHROMATE_LOG_LEVEL | No | Log level: silent, error, info, or debug. | info |
| CHROMATE_AUTO_CONNECT | No | Read Chrome 144+ DevToolsActivePort metadata before scanning ports. | true |
| CHROMATE_CDP_ENDPOINT | No | CDP HTTP or WebSocket endpoint. If omitted, Chromate auto-discovers local CDP. | |
| CHROMATE_SETTLE_DELAY_MS | No | Wait after auto actions in milliseconds. | 500 |
| CHROMATE_ACTION_TIMEOUT_MS | No | Command timeout in milliseconds. | 30000 |
| CHROMATE_CONNECT_TIMEOUT_MS | No | Connection timeout in milliseconds. | 10000 |
| CHROMATE_CDP_DISCOVERY_PORTS | No | Comma-separated local ports to scan. | 9222,9223,9224,9333 |
| CHROMATE_AUTO_CONNECT_CHANNEL | No | Chrome channel for default profile lookup: stable, beta, dev, or canary. | stable |
| CHROMATE_DISCOVERY_TIMEOUT_MS | No | Per-port discovery timeout in milliseconds. | 350 |
| CHROMATE_AUTO_CONNECT_USER_DATA_DIR | No | Explicit Chrome user data directory containing DevToolsActivePort. |
Capabilities
Features and capabilities supported by this server
| Capability | Details |
|---|---|
| tools | {
"listChanged": true
} |
Tools
Functions exposed to the LLM to take actions
| Name | Description |
|---|---|
| list_tabsC | List Chrome tabs available through the configured CDP endpoint. |
| select_tabB | Select the active tab for subsequent Chromate tools. |
| page_infoB | Return information about the currently selected page and viewport. |
| screenshotC | Capture the selected tab viewport using CSS viewport pixel coordinates. |
| clickA | Click at CSS viewport coordinates in the selected tab, then wait and return an after screenshot. |
| scrollB | Dispatch a mouse wheel event in the selected tab. |
| type_textA | Insert text into the focused element in the selected tab. |
| press_keyB | Dispatch a keyDown/keyUp pair to the selected tab. |
| waitB | Wait for page stability or for visible body text to appear. |
Prompts
Interactive templates invoked by user choice
| Name | Description |
|---|---|
No prompts | |
Resources
Contextual data attached and managed by the client
| Name | Description |
|---|---|
No resources | |
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