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lean_ctx/tools/registered/
ctx_discover.rs

1use rmcp::ErrorData;
2use rmcp::model::Tool;
3use serde_json::{Map, Value, json};
4
5use crate::server::tool_trait::{McpTool, ToolContext, ToolOutput, get_usize};
6use crate::tool_defs::tool_def;
7
8pub struct CtxDiscoverTool;
9
10impl McpTool for CtxDiscoverTool {
11    fn name(&self) -> &'static str {
12        "ctx_discover"
13    }
14
15    fn tool_def(&self) -> Tool {
16        tool_def(
17            "ctx_discover",
18            "Find shell commands not yet using lean-ctx compression — use when context feels bloated.\n\
19             Shows which commands would save tokens via lean-ctx patterns. limit=N caps results.\n\
20             ANTIPATTERN: not for finding compression bugs — reports missed opportunities only.\n\
21             Run 'lean-ctx init --global' to auto-compress all commands.",
22            json!({
23                "type": "object",
24                "properties": {
25                    "limit": { "type": "integer", "description": "Max results (default 15)" }
26                }
27            }),
28        )
29    }
30
31    fn handle(
32        &self,
33        args: &Map<String, Value>,
34        _ctx: &ToolContext,
35    ) -> Result<ToolOutput, ErrorData> {
36        let limit = get_usize(args, "limit").unwrap_or(15).min(100_000);
37        let history = crate::cli::load_shell_history_pub();
38        let result = crate::tools::ctx_discover::discover_from_history(&history, limit);
39
40        Ok(ToolOutput::simple(result))
41    }
42}