ToolCallContext

The evaluation input provided to policies at the Tool Call Interception point.

Schema ID: https://agentpolicyspecification.github.io/schemas/tool-call-context.schema.json

Properties

Property	Type	Required	Description
tool_name	string	Yes	The name of the tool the LLM has requested to invoke
arguments	object	Yes	The arguments provided by the LLM
calling_message	AssistantMessage	Yes	The assistant message that produced the tool call
metadata	Metadata	Yes	Agent and session context

AssistantMessage

Property	Type	Required	Description
role	"assistant"	Yes	Always "assistant"
content	string	Yes	The text content of the message

Metadata

Property	Type	Required	Description
agent_id	string	Yes	Unique identifier for the agent
session_id	string	Yes	Unique identifier for the session
timestamp	string (date-time)	Yes	ISO 8601 timestamp of the interception

Example

{
  "tool_name": "read_file",
  "arguments": { "path": "/workspace/data.csv" },
  "calling_message": {
    "role": "assistant",
    "content": "I will read the file to answer your question."
  },
  "metadata": {
    "agent_id": "agent-1",
    "session_id": "session-abc",
    "timestamp": "2026-03-31T10:00:01Z"
  }
}

Download

tool-call-context.schema.json