Fetch page content and extract readable text.
AI agents call web_fetch to retrieve information from AIOS Co-Founder MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and extracts content from web pages. It performs a read-only operation that queries external data sources without creating, modifying, deleting, or executing any operations. The extracted text is passive information retrieval.
From the tool's definition Tool name 'web_fetch' and description 'Fetch page content and extract readable text' indicate retrieval of data with no modification or side effects.
Attacks that exploit this kind of access
Fetch page content and extract readable text. It is categorised as a Read tool in the AIOS Co-Founder MCP MCP Server, which means it retrieves data without modifying state.
Register the AIOS Co-Founder MCP server in PolicyLayer and add a rule for web_fetch: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches AIOS Co-Founder MCP. Nothing to install.
web_fetch is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the web_fetch rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for web_fetch. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
web_fetch is provided by the AIOS Co-Founder MCP server (varun-b-nagaraj/python-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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