Agent call to mcp-tool is working with a hard-coded service.

- Added ToolClientSpec and ToolClient to implement a tool call.
- Updated agent-manager-react to invoke an MCP tool with a tool defined
  with 'mcp-tool' type.
Not generic, need to work out how to call the right parameters.

trustgraph-base/trustgraph/base/__init__.py

@@ -29,4 +29,5 @@ from . document_embeddings_client import DocumentEmbeddingsClientSpec
 from . agent_service import AgentService
 from . graph_rag_client import GraphRagClientSpec
 from . tool_service import ToolService
+from . tool_client import ToolClientSpec
 

trustgraph-base/trustgraph/base/tool_client.py

@@ -0,0 +1,40 @@
+
+import json
+
+from . request_response_spec import RequestResponse, RequestResponseSpec
+from .. schema import ToolRequest, ToolResponse
+
+class ToolClient(RequestResponse):
+
+    async def invoke(self, name, parameters={}, timeout=600):
+
+        if parameters is None:
+            parameters = {}
+
+        resp = await self.request(
+            ToolRequest(
+                name = name,
+                parameters = json.dumps(parameters),
+            ),
+            timeout=timeout
+        )
+
+        if resp.error:
+            raise RuntimeError(resp.error.message)
+
+        if resp.text: return resp.text
+
+        return json.loads(resp.object)
+
+class ToolClientSpec(RequestResponseSpec):
+    def __init__(
+            self, request_name, response_name,
+    ):
+        super(ToolClientSpec, self).__init__(
+            request_name = request_name,
+            request_schema = ToolRequest,
+            response_name = response_name,
+            response_schema = ToolResponse,
+            impl = ToolClient,
+        )
+