Struct WebFetchTool 

pub struct WebFetchTool;

P4c (S2 module 5 tools.web, S4a “trivially addable… single tool each, no loop changes”): fetch a URL and return it AS MARKDOWN (BP-2, catalog:44 “Fetch a URL, convert to markdown, return to model”), served from an on-disk cache within [WEB_FETCH_TTL_SECS] of the last fetch — CC’s WebFetch is markdown-converting and cached, and a model that re-fetches the same page mid-task should not pay for it twice. NOT registered by default — only reached via [capabilities.tools_web] (module 5), off by default (§3.1). SECURITY (S2.1 S17): honors ToolContext::network_policy when one is configured (see ToolContext::check_network) — a caller (SDK embedder) that has set up a sandbox/network policy on the context gets it enforced here too; with no policy configured (today’s honest default), the fetch is unrestricted, same posture as every other network-capable path in this crate today (C3).

Trait Implementations

impl Tool for WebFetchTool

fn name(&self) -> &str

Stable, unique tool name (what the model calls).

fn description(&self) -> &str

The built-in description. May be overridden via crate::Config.

fn parameters(&self) -> Value

JSON Schema describing the tool’s input object.

fn execute<'life0, 'life1, 'async_trait>( &'life0 self, args: Value, ctx: &'life1 ToolContext, ) -> Pin<Box<dyn Future<Output = Result<String>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Run the tool. Returns text to feed back to the model.

fn structured_output(&self) -> bool

Whether a successful textual result is also a complete JSON value that protocol adapters should expose as structured output. Text remains the model-facing representation, preserving compatibility.