🎯 Use case
This module implements the “WebFetchTool” tool (Web Fetch) — something the model can call at runtime alongside other agent tools. On the API surface it exposes WEB_FETCH_TOOL_NAME, DESCRIPTION, and makeSecondaryModelPrompt — mainly types, interfaces, or factory objects.
Generated from folder role, exports, dependency roots, and inline comments — not hand-reviewed for every path.
🧠 Inline summary
export const WEB_FETCH_TOOL_NAME = 'WebFetch' export const DESCRIPTION = ` - Fetches content from a specified URL and processes it using an AI model - Takes a URL and a prompt as input
📤 Exports (heuristic)
WEB_FETCH_TOOL_NAMEDESCRIPTIONmakeSecondaryModelPrompt
🖥️ Source preview
export const WEB_FETCH_TOOL_NAME = 'WebFetch'
export const DESCRIPTION = `
- Fetches content from a specified URL and processes it using an AI model
- Takes a URL and a prompt as input
- Fetches the URL content, converts HTML to markdown
- Processes the content with the prompt using a small, fast model
- Returns the model's response about the content
- Use this tool when you need to retrieve and analyze web content
Usage notes:
- IMPORTANT: If an MCP-provided web fetch tool is available, prefer using that tool instead of this one, as it may have fewer restrictions.
- The URL must be a fully-formed valid URL
- HTTP URLs will be automatically upgraded to HTTPS
- The prompt should describe what information you want to extract from the page
- This tool is read-only and does not modify any files
- Results may be summarized if the content is very large
- Includes a self-cleaning 15-minute cache for faster responses when repeatedly accessing the same URL
- When a URL redirects to a different host, the tool will inform you and provide the redirect URL in a special format. You should then make a new WebFetch request with the redirect URL to fetch the content.
- For GitHub URLs, prefer using the gh CLI via Bash instead (e.g., gh pr view, gh issue view, gh api).
`
export function makeSecondaryModelPrompt(
markdownContent: string,
prompt: string,
isPreapprovedDomain: boolean,
): string {
const guidelines = isPreapprovedDomain
? `Provide a concise response based on the content above. Include relevant details, code examples, and documentation excerpts as needed.`
: `Provide a concise response based only on the content above. In your response:
- Enforce a strict 125-character maximum for quotes from any source document. Open Source Software is ok as long as we respect the license.
- Use quotation marks for exact language from articles; any language outside of the quotation should never be word-for-word the same.
- You are not a lawyer and never comment on the legality of your own prompts and responses.
- Never produce or reproduce exact song lyrics.`
return `
Web page content:
---
${markdownContent}
---
${prompt}
${guidelines}
`
}