use rmcp::ErrorData;
use rmcp::model::Tool;
use serde_json::{Map, Value, json};
use crate::server::tool_trait::{McpTool, ToolContext, ToolOutput, get_int, get_str};
use crate::tool_defs::tool_def;
pub struct CtxCallgraphTool;
impl McpTool for CtxCallgraphTool {
fn name(&self) -> &'static str {
"ctx_callgraph"
}
fn tool_def(&self) -> Tool {
tool_def(
"ctx_callgraph",
"Callers/callees analysis — who calls a function and what it calls.\n\
action=callers symbol='fn' returns every call site with file:line.\n\
For END-TO-END flow tracing (how does X reach Y), use ctx_compose FIRST\n\
— one call returns the path + source. Use ctx_callgraph only when you need\n\
exhaustive enumeration of ALL callers/callees for a single symbol.\n\
action=trace from→to finds path between two symbols. depth=N for BFS depth.",
json!({
"type": "object",
"properties": {
"action": {
"type": "string",
"description": "callers|callees|trace|risk",
"enum": ["callers", "callees", "trace", "risk"]
},
"symbol": {
"type": "string",
"description": "Symbol name"
},
"file": {
"type": "string",
"description": "Scope results to file"
},
"depth": {
"type": "integer",
"description": "BFS depth (1-5)",
"minimum": 1,
"maximum": 5
},
"from": {
"type": "string",
"description": "Source symbol"
},
"to": {
"type": "string",
"description": "Target symbol"
}
}
}),
)
}
fn handle(
&self,
args: &Map<String, Value>,
ctx: &ToolContext,
) -> Result<ToolOutput, ErrorData> {
let action = get_str(args, "action").unwrap_or_else(|| "callers".to_string());
let action_normalized = match action.to_lowercase().as_str() {
"callers" | "caller" => "callers",
"callees" | "callee" => "callees",
"trace" => "trace",
"risk" => "risk",
_ => action.as_str(),
}
.to_string();
let symbol = get_str(args, "symbol");
let file = get_str(args, "file");
let depth = get_int(args, "depth").unwrap_or(1).clamp(1, 5) as usize;
let from = get_str(args, "from");
let to = get_str(args, "to");
let result = crate::tools::ctx_callgraph::handle(
&action_normalized,
symbol.as_deref(),
file.as_deref(),
&ctx.project_root,
depth,
from.as_deref(),
to.as_deref(),
);
Ok(ToolOutput {
text: result,
original_tokens: 0,
saved_tokens: 0,
mode: Some(action_normalized),
path: None,
changed: false,
shell_outcome: None,
})
}
}