use rmcp::model::Tool;
use rmcp::ErrorData;
use serde_json::{json, Map, Value};
use crate::server::tool_trait::{get_str, McpTool, ToolContext, ToolOutput};
use crate::tool_defs::tool_def;
pub struct CtxOutlineTool;
impl McpTool for CtxOutlineTool {
fn name(&self) -> &'static str {
"ctx_outline"
}
fn tool_def(&self) -> Tool {
tool_def(
"ctx_outline",
"List all symbols in a file (functions, structs, classes, methods) with signatures. \
Much fewer tokens than reading the full file.",
json!({
"type": "object",
"properties": {
"path": { "type": "string", "description": "File path" },
"kind": { "type": "string", "description": "Optional filter: fn|struct|class|all" }
},
"required": ["path"]
}),
)
}
fn handle(
&self,
args: &Map<String, Value>,
ctx: &ToolContext,
) -> Result<ToolOutput, ErrorData> {
let path = ctx
.resolved_path("path")
.ok_or_else(|| ErrorData::invalid_params("path is required", None))?
.to_string();
let kind = get_str(args, "kind");
let (result, original) = crate::tools::ctx_outline::handle(&path, kind.as_deref());
let sent = crate::core::tokens::count_tokens(&result);
let saved = original.saturating_sub(sent);
Ok(ToolOutput {
text: result,
original_tokens: original,
saved_tokens: saved,
mode: kind,
path: Some(path),
})
}
}