use rmcp::ErrorData;
use rmcp::model::Tool;
use serde_json::{Map, Value, json};
use crate::server::tool_trait::{McpTool, ToolContext, ToolOutput, get_str, get_usize};
use crate::tool_defs::tool_def;
pub struct CtxCostTool;
impl McpTool for CtxCostTool {
fn name(&self) -> &'static str {
"ctx_cost"
}
fn tool_def(&self) -> Tool {
tool_def(
"ctx_cost",
"Cost attribution — track tokens and cost per agent/tool call. Local-first, no external billing.\n\
Actions: report (summary), agent (per-agent), tools (per-tool), json (machine), status (live), reset (zero).\n\
WORKFLOW: call report to find top cost drivers, then agent/tools for detail.",
json!({
"type": "object",
"properties": {
"action": {
"type": "string",
"enum": ["report", "agent", "tools", "json", "reset", "status"],
"description": "report|agent|tools|json|reset|status"
},
"agent_id": {
"type": "string",
"description": "Agent ID"
},
"limit": {
"type": "integer",
"description": "Max rows"
}
}
}),
)
}
fn handle(
&self,
args: &Map<String, Value>,
_ctx: &ToolContext,
) -> Result<ToolOutput, ErrorData> {
let action = get_str(args, "action").unwrap_or_else(|| "report".to_string());
let agent_id = get_str(args, "agent_id");
let limit = get_usize(args, "limit").map(|n| n.min(100_000));
let result = crate::tools::ctx_cost::handle(&action, agent_id.as_deref(), limit);
Ok(ToolOutput {
text: result,
original_tokens: 0,
saved_tokens: 0,
mode: Some(action),
path: None,
changed: false,
shell_outcome: None,
content_blocks: None,
})
}
}