lean-ctx 3.7.3

Context Runtime for AI Agents with CCP. 68 MCP tools, 10 read modes, 60+ compression patterns, cross-session memory (CCP), persistent AI knowledge with temporal facts + contradiction detection, multi-agent context sharing, LITM-aware positioning, AAAK compact format, adaptive compression with Thompson Sampling bandits. Supports 24+ AI tools. Reduces LLM token consumption by up to 99%.
Documentation 
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use rmcp::model::Tool;
use rmcp::ErrorData;
use serde_json::{json, Map, Value};

use crate::server::tool_trait::{get_int, get_str, McpTool, ToolContext, ToolOutput};
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",
            "Call graph query: callers/callees (multi-hop BFS), trace path between symbols, risk classification by caller count.",
            json!({
                "type": "object",
                "properties": {
                    "action": {
                        "type": "string",
                        "description": "callers|callees|trace|risk (default: callers)",
                        "enum": ["callers", "callees", "trace", "risk"]
                    },
                    "symbol": {
                        "type": "string",
                        "description": "Symbol name (required for callers/callees/risk)"
                    },
                    "direction": {
                        "type": "string",
                        "description": "Deprecated — use action instead. callers|callees"
                    },
                    "file": {
                        "type": "string",
                        "description": "Optional: scope results to a specific file"
                    },
                    "depth": {
                        "type": "integer",
                        "description": "BFS depth for callers/callees (1–5, default 1)",
                        "minimum": 1,
                        "maximum": 5
                    },
                    "from": {
                        "type": "string",
                        "description": "Source symbol for trace action"
                    },
                    "to": {
                        "type": "string",
                        "description": "Target symbol for trace action"
                    }
                }
            }),
        )
    }

    fn handle(
        &self,
        args: &Map<String, Value>,
        ctx: &ToolContext,
    ) -> Result<ToolOutput, ErrorData> {
        let action = get_str(args, "action")
            .or_else(|| get_str(args, "direction"))
            .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,
        })
    }
}