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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 | 19x 19x 13x 13x 13x 13x 13x 13x 1x 1x 10x 10x 8x 8x 2x | import { Logger } from '@nestjs/common';
import { ActionHandler } from './action-handler.interface';
import {
ActionExecutionResult,
PlanExecutionContext,
ToolMetadata,
} from '../llm-orchestration.interfaces';
import { McpService } from '../../mcp/mcp.service';
/**
* Generic action handler for individual MCP tools.
* Each MCP tool is surfaced as its own native tool definition with the name
* pattern `{server_name}__{tool_name}` (double underscore).
*
* This handler is created dynamically for each active MCP tool discovered
* via McpService.
*/
export class McpToolActionHandler implements ActionHandler {
readonly toolName: string;
private readonly logger = new Logger(McpToolActionHandler.name);
constructor(
private readonly serverName: string,
private readonly toolNameRaw: string,
private readonly mcpService: McpService,
private readonly toolDescription: string,
) {
this.toolName = `${serverName}__${toolNameRaw}`;
}
getMetadata(): ToolMetadata {
return {
name: this.toolName,
description: this.toolDescription,
arguments: [],
};
}
getDefinition(): string {
return `## ${this.toolName}
${this.toolDescription}
Executed via MCP server "${this.serverName}", tool "${this.toolNameRaw}".`;
}
async execute(
args: Record<string, any>,
_context: PlanExecutionContext,
): Promise<ActionExecutionResult> {
try {
const { stdout, stderr } = await this.mcpService.executeMcpTool(
this.serverName,
this.toolNameRaw,
args,
);
const unifiedOutput = stdout || stderr || '(Tool produced no output)';
return {
status: 'SUCCESS',
summary: `MCP tool "${this.serverName}.${this.toolNameRaw}" executed.`,
persisted_args: {
server_name: this.serverName,
tool_name: this.toolNameRaw,
arguments: JSON.stringify(args),
plain: unifiedOutput,
},
execution_log: {
output: unifiedOutput,
},
};
} catch (error) {
return {
status: 'FAILURE',
summary: `MCP tool "${this.serverName}.${this.toolNameRaw}" failed.`,
error_message: error.message,
persisted_args: {
server_name: this.serverName,
tool_name: this.toolNameRaw,
arguments: JSON.stringify(args),
plain: `Error: ${error.message}`,
},
execution_log: {
output: '',
error_message: error.message,
},
};
}
}
}
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