get-context
Extract website context for generating accurate test cases by accessing DOM elements and page structure through browser automation.
Instructions
Get the website context which would be used to write the testcase
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
No arguments | |||
Implementation Reference
- src/mcp/index.ts:235-311 (handler)The async handler function for the get-context tool. It fetches the current state, processes messages into formatted text or image content (prefixing DOM/Text, parsing and cleaning Interactions, base64 images), accumulates until 20k chars, splices processed from state, updates state, appends remaining note if any, returns content array.async () => { posthogServer.capture({ distinctId: getUserId(), event: 'get_context', }); const state = getState(); if (state.messages.length === 0) { return { content: [ { type: "text", text: `No messages available` } ] }; } const content: any = []; let totalLength = 0; let messagesProcessed = 0; while (messagesProcessed < state.messages.length && totalLength < 20000) { const message = state.messages[messagesProcessed]; let currentContent = message.content if (message.type === 'DOM') { currentContent = `DOM: ${message.content}`; } else if (message.type === 'Text') { currentContent = `Text: ${message.content}`; } else if (message.type === 'Interaction') { const interaction = JSON.parse(message.content); delete interaction.eventId; delete interaction.dom; delete interaction.elementUUID; if (interaction.selectors) { interaction.selectors = interaction.selectors.slice(0, 10); } currentContent = JSON.stringify(interaction); } else if (message.type === 'Image') { currentContent = message.content; } totalLength += currentContent.length; const item: any = {} const isImage = message.type === 'Image'; if (isImage) { item.type = "image"; item.data = message.content; item.mimeType = "image/png"; } else { item.type = "text"; item.text = currentContent; } content.push(item); messagesProcessed++; } // Remove processed messages state.messages.splice(0, messagesProcessed); updateState(page, state); const remainingCount = state.messages.length; if (remainingCount > 0) { content.push({ type: "text", text: `Remaining ${remainingCount} messages, please fetch those in next requests.\n` }); } return { content }; }
- src/mcp/index.ts:231-312 (registration)Registers the 'get-context' tool with McpServer using server.tool(name, description, inputSchema, handlerFn). Input schema is empty object (no params).server.tool( "get-context", "Get the website context which would be used to write the testcase", {}, async () => { posthogServer.capture({ distinctId: getUserId(), event: 'get_context', }); const state = getState(); if (state.messages.length === 0) { return { content: [ { type: "text", text: `No messages available` } ] }; } const content: any = []; let totalLength = 0; let messagesProcessed = 0; while (messagesProcessed < state.messages.length && totalLength < 20000) { const message = state.messages[messagesProcessed]; let currentContent = message.content if (message.type === 'DOM') { currentContent = `DOM: ${message.content}`; } else if (message.type === 'Text') { currentContent = `Text: ${message.content}`; } else if (message.type === 'Interaction') { const interaction = JSON.parse(message.content); delete interaction.eventId; delete interaction.dom; delete interaction.elementUUID; if (interaction.selectors) { interaction.selectors = interaction.selectors.slice(0, 10); } currentContent = JSON.stringify(interaction); } else if (message.type === 'Image') { currentContent = message.content; } totalLength += currentContent.length; const item: any = {} const isImage = message.type === 'Image'; if (isImage) { item.type = "image"; item.data = message.content; item.mimeType = "image/png"; } else { item.type = "text"; item.text = currentContent; } content.push(item); messagesProcessed++; } // Remove processed messages state.messages.splice(0, messagesProcessed); updateState(page, state); const remainingCount = state.messages.length; if (remainingCount > 0) { content.push({ type: "text", text: `Remaining ${remainingCount} messages, please fetch those in next requests.\n` }); } return { content }; } );
- src/mcp/state.ts:57-59 (helper)Helper function to get a deep-cloned copy of the global state, which contains the messages array used by get-context handler.const getState = () => { return structuredClone(globalState); }
- src/mcp/state.ts:61-64 (helper)Helper function to update the global state with new state and sync it to the React toolbox iframe via page evaluation.const updateState = (page: Page, state: typeof globalState) => { globalState = structuredClone(state); syncToReact(page, state); }