# pi

> Pi coding agent as an iii worker — pi::* functions run headless Pi turns, mirror raw events onto pi::events, and stream AgentEvent frames onto agent::events.

| field | value |
|-------|-------|
| version | 0.1.9 |
| type | bundle |
| repo | https://github.com/iii-hq/workers |
| author | iii |

## installation

```sh
iii worker add pi@0.1.9
```

## configuration

```yaml
- defaults:
    agent_dir: 
    cwd: 
    model: 
    thinking_level: medium
    tools:

  engine_url: ws://127.0.0.1:49134
  events_stream: agent::events
  iii_context: true
  raw_events_stream: pi::events
```

## dependencies

- `iii-state` @ `^0.21.6`
- `iii-stream` @ `^0.21.6`

## readme

# pi

Pi coding agent as an iii worker: the Pi API exposed as functions and streams on the iii bus, nothing else. The worker runs the same in-process agent loop Pi runs in the terminal, with the same tools (read, bash, edit, write) against any host directory. `pi::run` executes one headless turn and returns the result; the raw Pi events mirror verbatim onto the `pi::events` stream, and a translated AgentEvent view lands on `agent::events`, so the iii console, the acp worker, and any sibling worker observe a Pi run exactly like a native harness turn. The worker also registers `run::start_and_wait`, the same entrypoint the console and the acp worker drive, so both run Pi with no changes.

## Install

```bash
iii worker add pi
```

Pi runs the loop in-process (no CLI subprocess), so the worker environment needs model credentials — `ANTHROPIC_API_KEY` (or the provider key Pi is configured for) or an existing Pi login.

## Skills

Install the `pi` agent skill for Claude Code, Cursor, and 30+ other agents:

```bash
npx skills add iii-hq/workers --skill pi
```

## Quickstart

From zero to a Pi turn over the bus:

```bash
curl -fsSL https://install.iii.dev/iii/main/install.sh | sh
iii worker add pi
iii   # starts the engine + worker
```

Then talk to it like any other function: from the console chat, from `iii trigger pi::run`, or from any SDK:

```ts
import { registerWorker } from 'iii-sdk';

const iii = registerWorker('ws://127.0.0.1:49134', { workerName: 'demo' });

const res = await iii.trigger({
  function_id: 'pi::run',
  payload: {
    prompt: 'Add a /health endpoint to server.ts and run the tests',
    cwd: '/path/to/repo',
  },
  timeout_ms: 600_000,
});
// { session_id, pi_session_id, result, stop_reason, usage, total_cost_usd }
```

Or straight from the terminal with the `iii trigger` CLI:

```bash
# one full turn (raise the timeout; the default 30s is too short for agent turns)
iii trigger pi::run --timeout-ms 600000 \
  --json '{"prompt":"add a /health endpoint and run the tests","cwd":"/path/to/repo"}'

# quick reads use key=value syntax
iii trigger pi::sessions::list
iii trigger pi::status session_id=<session_id>

# background turn + control
iii trigger pi::start --json '{"prompt":"...","cwd":"/path/to/repo"}'
iii trigger pi::stop session_id=<session_id>

# ask the running engine for a function's description
iii trigger pi::run --help
```

A turn from the CLI returns the result with token usage and cost:

![iii trigger pi::run returning pong with usage and cost](https://raw.githubusercontent.com/iii-hq/workers/main/pi/assets/cli-run.png)

`iii trigger pi::run --help` prints the published request schema as a parameter table:

![iii trigger pi::run --help printing the request schema as a parameter table](https://raw.githubusercontent.com/iii-hq/workers/main/pi/assets/cli-help.png)

Call `pi::run` again with the returned `session_id` to continue the same conversation: the worker maps iii session ids to Pi session files in engine state and resumes automatically.

![iii trigger pi::sessions::list showing the stored session records](https://raw.githubusercontent.com/iii-hq/workers/main/pi/assets/cli-sessions.png)

Two ids come back from every run. `session_id` is the iii session id: the key for `pi::status`, `pi::stop`, `pi::steer`, resume, and the stream group. `pi_session_id` is Pi's internal session id — returned for reference, not a lookup key.

Long turns: use `pi::start` to return immediately, then watch `agent::events` (group_id = your session_id) for `message_complete`, `function_execution_start/end`, and `turn_end` frames. `pi::stop` interrupts a live run, `pi::status` reads a point-in-time view, `pi::sessions::list` enumerates past sessions.

## Functions

| Function | Purpose |
| --- | --- |
| `pi::run` | Run one turn, wait, return the final result |
| `pi::start` | Fire-and-forget turn; progress arrives on `agent::events` |
| `pi::steer` | Inject a steering instruction into a live run |
| `pi::follow_up` | Queue a follow-up message for a live run |
| `pi::stop` | Interrupt a live run |
| `pi::status` | Session state, live flag, usage, cost |
| `pi::sessions::list` | All sessions this worker has run |
| `run::start_and_wait` | Alias for `pi::run` under the entrypoint the console and acp worker drive |

`pi::run` accepts either a bare `prompt` string or a `messages` array (`[{ role: 'user', content: [{ type: 'text', text }] }]`), plus `model`, `cwd`, `thinking_level`, `tools`, and `iii_context` overrides.

### Raw events

Every event Pi emits (`agent_start/end`, `turn_start/end`, `message_start/update/end`, `tool_execution_start/update/end`, and the session events `queue_update`, `compaction_start/end`) is mirrored verbatim onto the `pi::events` stream, group_id = session_id. Consumers that want the exact Pi event format read `pi::events`; consumers that want harness-shaped frames read `agent::events`. Same turn, two views.

## Steering a live run

A turn started with `pi::start` keeps its session reachable while it streams. Two functions push instructions into it:

```bash
# start a long run
iii trigger pi::start --json '{"prompt":"refactor the auth module","cwd":"/path/to/repo","session_id":"s1"}'

# redirect it mid-flight — applied after the current tool calls finish
iii trigger pi::steer --json '{"session_id":"s1","prompt":"stop, keep the public API unchanged"}'

# queue work for after it would otherwise stop
iii trigger pi::follow_up --json '{"session_id":"s1","prompt":"then add tests for the new paths"}'
```

`pi::steer` maps onto Pi's steering queue (interrupt-style), `pi::follow_up` onto its follow-up queue (wait-style). Both no-op with `{steered:false}` / `{queued:false}` when no run is live for the session.

## The agent on the bus

By default every turn's prompt carries the iii runtime context: the same engine-grounded rules as the harness identity prompts, retargeted to the `iii` CLI the agent reaches through its shell. The agent discovers capabilities from the live engine instead of memory — `iii trigger engine::functions::list` to find function ids, `iii trigger <fn> --help` as the contract before every first call, the registry flow (`directory::registry::workers::list/info`, `worker::add`) when nothing registered fits — plus the calling rules and error-handling discipline that go with them. Local file edits stay on Pi's native tools; backend actions go through registered functions.

```bash
# the agent answers this by querying the live engine itself
iii trigger pi::run --timeout-ms 300000 \
  --json '{"prompt":"List every worker connected to this engine and what each one does.","cwd":"/tmp"}'
```

Pi answers by querying the live engine itself, grouping every connected worker by role:

![iii trigger pi::run enumerating every worker connected to the engine](https://raw.githubusercontent.com/iii-hq/workers/main/pi/assets/cli-discovery.png)

The context is prepended on a fresh session and skipped on resume (it is already in the conversation history). Turn it off entirely with `"iii_context": false` per call or globally in `config.yaml`.

## Thinking and tools

`thinking_level` maps straight onto Pi's reasoning levels, per turn:

| Level | Behavior |
| --- | --- |
| `off` | No extended reasoning |
| `minimal` / `low` | Short reasoning budget |
| `medium` | The worker default |
| `high` / `xhigh` | Deep reasoning (xhigh on supported model families) |

`tools` is an allowlist: leave it empty for Pi's defaults (`read`, `bash`, `edit`, `write`), or pass a subset to narrow what the turn can do — e.g. `{"tools":["read","bash"]}` for a read-and-run turn that cannot edit or write files.

## Configuration

```yaml
engine_url: ws://127.0.0.1:49134

defaults:
  model: ""                # empty = Pi settings default; else "provider/modelId"
  thinking_level: medium   # off | minimal | low | medium | high | xhigh
  cwd: ""                  # default working directory for runs
  tools: []                # empty = Pi defaults (read, bash, edit, write)
  agent_dir: ""            # Pi global config dir; empty = ~/.pi/agent

events_stream: agent::events   # translated AgentEvent frames
raw_events_stream: pi::events  # verbatim Pi events
iii_context: true              # prepend the iii runtime context on fresh sessions
```

`config.yaml` is the seed: on first boot the worker registers it with the built-in `configuration` worker as the initial value, then reads the live value back and hot-reloads on every `configuration:updated`. `engine_url` is excluded from the managed schema — it is bootstrap, so it stays on the local seed / `--url`.

## Observability

Every `pi::run` is an ordinary traced invocation on the engine: the trace carries the full input payload (prompt, cwd, caller worker id) and the output (result, stop reason, token usage, cost) as span events, with per-function p50/p95/p99 in the console's trace explorer — no extra instrumentation in the worker.

## How it maps

| Pi | iii |
| --- | --- |
| `AgentSession.prompt()` turn | `pi::run` invocation |
| every AgentSession event, verbatim | `pi::events` stream frame |
| assistant `message_end` | `message_complete` frame on `agent::events` |
| `tool_execution_start` / `tool_execution_end` | `function_execution_start` / `function_execution_end` frames |
| final result | `turn_end` + `agent_end` frames, function return value |
| `steer()` / `followUp()` | `pi::steer` / `pi::follow_up` |
| session resume | engine state scope `pi_sessions`, keyed by iii session_id |
| extra capability | another iii worker on the bus (`shell`, `database`, `storage`, ...) |

## api reference

```json
{
  "functions": [
    {
      "description": "Queue a follow-up message for a live Pi run; processed after the agent would otherwise stop.",
      "metadata": {},
      "name": "pi::follow_up",
      "request_schema": {
        "additionalProperties": false,
        "properties": {
          "prompt": {
            "description": "Instruction to inject into the live run",
            "type": "string"
          },
          "session_id": {
            "description": "iii session id of a live run",
            "type": "string"
          }
        },
        "required": [
          "session_id",
          "prompt"
        ],
        "type": "object"
      },
      "response_schema": {
        "additionalProperties": false,
        "properties": {
          "queued": {
            "type": "boolean"
          },
          "reason": {
            "type": "string"
          },
          "session_id": {
            "type": "string"
          }
        },
        "required": [
          "session_id",
          "queued"
        ],
        "type": "object"
      }
    },
    {
      "description": "Internal: reload pi configuration when it changes.",
      "metadata": {},
      "name": "pi::on-config-change",
      "request_schema": {
        "properties": {},
        "type": "object"
      },
      "response_schema": {
        "type": "null"
      }
    },
    {
      "description": "Run one Pi coding-agent turn and wait for the result. Accepts `prompt` or a `messages` array; streams raw Pi events onto pi::events, AgentEvent frames onto agent::events, and returns {session_id, result, usage, total_cost_usd}.",
      "metadata": {},
      "name": "pi::run",
      "request_schema": {
        "additionalProperties": false,
        "properties": {
          "cwd": {
            "description": "Working directory the turn runs in",
            "type": "string"
          },
          "iii_context": {
            "description": "Prepend the iii runtime discovery context (engine catalog via the iii CLI)",
            "type": "boolean"
          },
          "messages": {
            "description": "Alternative to prompt: role/content messages; the last user entry becomes the prompt",
            "items": {
              "additionalProperties": false,
              "properties": {
                "content": {
                  "anyOf": [
                    {
                      "type": "string"
                    },
                    {
                      "items": {
                        "additionalProperties": {},
                        "properties": {
                          "type": {
                            "type": "string"
                          }
                        },
                        "required": [
                          "type"
                        ],
                        "type": "object"
                      },
                      "type": "array"
                    }
                  ]
                },
                "role": {
                  "type": "string"
                }
              },
              "required": [
                "role",
                "content"
              ],
              "type": "object"
            },
            "type": "array"
          },
          "model": {
            "description": "Model as \"provider/modelId\"; empty = Pi settings default",
            "type": "string"
          },
          "prompt": {
            "description": "The user prompt for this turn",
            "type": "string"
          },
          "session_id": {
            "description": "iii session id; reuse to resume the same Pi conversation",
            "type": "string"
          },
          "thinking_level": {
            "description": "Reasoning depth for this turn",
            "enum": [
              "off",
              "minimal",
              "low",
              "medium",
              "high",
              "xhigh"
            ],
            "type": "string"
          },
          "timeout_ms": {
            "description": "Reserved for callers; not forwarded",
            "exclusiveMinimum": 0,
            "maximum": 9007199254740991,
            "type": "integer"
          },
          "tools": {
            "description": "Tool allowlist; empty = Pi defaults (read, bash, edit, write)",
            "items": {
              "type": "string"
            },
            "type": "array"
          }
        },
        "type": "object"
      },
      "response_schema": {
        "additionalProperties": false,
        "properties": {
          "busy": {
            "type": "boolean"
          },
          "is_error": {
            "type": "boolean"
          },
          "num_turns": {
            "type": "number"
          },
          "pi_session_id": {
            "anyOf": [
              {
                "type": "string"
              },
              {
                "type": "null"
              }
            ]
          },
          "reason": {
            "type": "string"
          },
          "result": {
            "type": "string"
          },
          "session_id": {
            "type": "string"
          },
          "stop_reason": {
            "type": "string"
          },
          "total_cost_usd": {
            "type": "number"
          },
          "usage": {
            "anyOf": [
              {
                "additionalProperties": false,
                "properties": {
                  "cache_read_tokens": {
                    "type": "number"
                  },
                  "cache_write_tokens": {
                    "type": "number"
                  },
                  "input_tokens": {
                    "type": "number"
                  },
                  "output_tokens": {
                    "type": "number"
                  }
                },
                "required": [
                  "input_tokens",
                  "output_tokens"
                ],
                "type": "object"
              },
              {
                "type": "null"
              }
            ]
          }
        },
        "required": [
          "session_id"
        ],
        "type": "object"
      }
    },
    {
      "description": "List every Pi session this worker has run.",
      "metadata": {},
      "name": "pi::sessions::list",
      "request_schema": {
        "properties": {},
        "type": "object"
      },
      "response_schema": {
        "additionalProperties": false,
        "properties": {
          "sessions": {
            "items": {
              "additionalProperties": false,
              "properties": {
                "cwd": {
                  "type": "string"
                },
                "model": {
                  "type": "string"
                },
                "pi_session_id": {
                  "anyOf": [
                    {
                      "type": "string"
                    },
                    {
                      "type": "null"
                    }
                  ]
                },
                "session_file": {
                  "anyOf": [
                    {
                      "type": "string"
                    },
                    {
                      "type": "null"
                    }
                  ]
                },
                "session_id": {
                  "type": "string"
                },
                "status": {
                  "enum": [
                    "working",
                    "done",
                    "error"
                  ],
                  "type": "string"
                },
                "total_cost_usd": {
                  "type": "number"
                },
                "turns": {
                  "type": "number"
                },
                "updated_at_ms": {
                  "type": "number"
                },
                "usage": {
                  "anyOf": [
                    {
                      "additionalProperties": false,
                      "properties": {
                        "cache_read_tokens": {
                          "type": "number"
                        },
                        "cache_write_tokens": {
                          "type": "number"
                        },
                        "input_tokens": {
                          "type": "number"
                        },
                        "output_tokens": {
                          "type": "number"
                        }
                      },
                      "required": [
                        "input_tokens",
                        "output_tokens"
                      ],
                      "type": "object"
                    },
                    {
                      "type": "null"
                    }
                  ]
                }
              },
              "required": [
                "session_id",
                "pi_session_id",
                "session_file",
                "cwd",
                "model",
                "status",
                "turns",
                "total_cost_usd",
                "usage",
                "updated_at_ms"
              ],
              "type": "object"
            },
            "type": "array"
          }
        },
        "required": [
          "sessions"
        ],
        "type": "object"
      }
    },
    {
      "description": "Start a Pi turn and return immediately; watch agent::events (group_id = session_id) for progress and turn_end.",
      "metadata": {},
      "name": "pi::start",
      "request_schema": {
        "additionalProperties": false,
        "properties": {
          "cwd": {
            "description": "Working directory the turn runs in",
            "type": "string"
          },
          "iii_context": {
            "description": "Prepend the iii runtime discovery context (engine catalog via the iii CLI)",
            "type": "boolean"
          },
          "messages": {
            "description": "Alternative to prompt: role/content messages; the last user entry becomes the prompt",
            "items": {
              "additionalProperties": false,
              "properties": {
                "content": {
                  "anyOf": [
                    {
                      "type": "string"
                    },
                    {
                      "items": {
                        "additionalProperties": {},
                        "properties": {
                          "type": {
                            "type": "string"
                          }
                        },
                        "required": [
                          "type"
                        ],
                        "type": "object"
                      },
                      "type": "array"
                    }
                  ]
                },
                "role": {
                  "type": "string"
                }
              },
              "required": [
                "role",
                "content"
              ],
              "type": "object"
            },
            "type": "array"
          },
          "model": {
            "description": "Model as \"provider/modelId\"; empty = Pi settings default",
            "type": "string"
          },
          "prompt": {
            "description": "The user prompt for this turn",
            "type": "string"
          },
          "session_id": {
            "description": "iii session id; reuse to resume the same Pi conversation",
            "type": "string"
          },
          "thinking_level": {
            "description": "Reasoning depth for this turn",
            "enum": [
              "off",
              "minimal",
              "low",
              "medium",
              "high",
              "xhigh"
            ],
            "type": "string"
          },
          "timeout_ms": {
            "description": "Reserved for callers; not forwarded",
            "exclusiveMinimum": 0,
            "maximum": 9007199254740991,
            "type": "integer"
          },
          "tools": {
            "description": "Tool allowlist; empty = Pi defaults (read, bash, edit, write)",
            "items": {
              "type": "string"
            },
            "type": "array"
          }
        },
        "type": "object"
      },
      "response_schema": {
        "additionalProperties": false,
        "properties": {
          "busy": {
            "type": "boolean"
          },
          "reason": {
            "type": "string"
          },
          "session_id": {
            "type": "string"
          },
          "started": {
            "type": "boolean"
          }
        },
        "required": [
          "session_id",
          "started"
        ],
        "type": "object"
      }
    },
    {
      "description": "Point-in-time status of a Pi session.",
      "metadata": {},
      "name": "pi::status",
      "request_schema": {
        "additionalProperties": false,
        "properties": {
          "session_id": {
            "description": "iii session id returned by pi::run / pi::start",
            "type": "string"
          }
        },
        "required": [
          "session_id"
        ],
        "type": "object"
      },
      "response_schema": {
        "additionalProperties": false,
        "properties": {
          "live": {
            "type": "boolean"
          },
          "record": {
            "anyOf": [
              {
                "additionalProperties": false,
                "properties": {
                  "cwd": {
                    "type": "string"
                  },
                  "model": {
                    "type": "string"
                  },
                  "pi_session_id": {
                    "anyOf": [
                      {
                        "type": "string"
                      },
                      {
                        "type": "null"
                      }
                    ]
                  },
                  "session_file": {
                    "anyOf": [
                      {
                        "type": "string"
                      },
                      {
                        "type": "null"
                      }
                    ]
                  },
                  "session_id": {
                    "type": "string"
                  },
                  "status": {
                    "enum": [
                      "working",
                      "done",
                      "error"
                    ],
                    "type": "string"
                  },
                  "total_cost_usd": {
                    "type": "number"
                  },
                  "turns": {
                    "type": "number"
                  },
                  "updated_at_ms": {
                    "type": "number"
                  },
                  "usage": {
                    "anyOf": [
                      {
                        "additionalProperties": false,
                        "properties": {
                          "cache_read_tokens": {
                            "type": "number"
                          },
                          "cache_write_tokens": {
                            "type": "number"
                          },
                          "input_tokens": {
                            "type": "number"
                          },
                          "output_tokens": {
                            "type": "number"
                          }
                        },
                        "required": [
                          "input_tokens",
                          "output_tokens"
                        ],
                        "type": "object"
                      },
                      {
                        "type": "null"
                      }
                    ]
                  }
                },
                "required": [
                  "session_id",
                  "pi_session_id",
                  "session_file",
                  "cwd",
                  "model",
                  "status",
                  "turns",
                  "total_cost_usd",
                  "usage",
                  "updated_at_ms"
                ],
                "type": "object"
              },
              {
                "type": "null"
              }
            ]
          },
          "session_id": {
            "type": "string"
          }
        },
        "required": [
          "session_id",
          "live",
          "record"
        ],
        "type": "object"
      }
    },
    {
      "description": "Inject a steering instruction into a live Pi run; applied after the current tool calls finish.",
      "metadata": {},
      "name": "pi::steer",
      "request_schema": {
        "additionalProperties": false,
        "properties": {
          "prompt": {
            "description": "Instruction to inject into the live run",
            "type": "string"
          },
          "session_id": {
            "description": "iii session id of a live run",
            "type": "string"
          }
        },
        "required": [
          "session_id",
          "prompt"
        ],
        "type": "object"
      },
      "response_schema": {
        "additionalProperties": false,
        "properties": {
          "reason": {
            "type": "string"
          },
          "session_id": {
            "type": "string"
          },
          "steered": {
            "type": "boolean"
          }
        },
        "required": [
          "session_id",
          "steered"
        ],
        "type": "object"
      }
    },
    {
      "description": "Interrupt a live Pi run for a session.",
      "metadata": {},
      "name": "pi::stop",
      "request_schema": {
        "additionalProperties": false,
        "properties": {
          "session_id": {
            "description": "iii session id returned by pi::run / pi::start",
            "type": "string"
          }
        },
        "required": [
          "session_id"
        ],
        "type": "object"
      },
      "response_schema": {
        "additionalProperties": false,
        "properties": {
          "reason": {
            "type": "string"
          },
          "session_id": {
            "type": "string"
          },
          "stopped": {
            "type": "boolean"
          }
        },
        "required": [
          "session_id",
          "stopped"
        ],
        "type": "object"
      }
    },
    {
      "description": "Alias for pi::run under the shared agent entrypoint: run a turn for {session_id, messages} and return when it ends.",
      "metadata": {},
      "name": "run::start_and_wait",
      "request_schema": {
        "additionalProperties": false,
        "properties": {
          "cwd": {
            "description": "Working directory the turn runs in",
            "type": "string"
          },
          "iii_context": {
            "description": "Prepend the iii runtime discovery context (engine catalog via the iii CLI)",
            "type": "boolean"
          },
          "messages": {
            "description": "Alternative to prompt: role/content messages; the last user entry becomes the prompt",
            "items": {
              "additionalProperties": false,
              "properties": {
                "content": {
                  "anyOf": [
                    {
                      "type": "string"
                    },
                    {
                      "items": {
                        "additionalProperties": {},
                        "properties": {
                          "type": {
                            "type": "string"
                          }
                        },
                        "required": [
                          "type"
                        ],
                        "type": "object"
                      },
                      "type": "array"
                    }
                  ]
                },
                "role": {
                  "type": "string"
                }
              },
              "required": [
                "role",
                "content"
              ],
              "type": "object"
            },
            "type": "array"
          },
          "model": {
            "description": "Model as \"provider/modelId\"; empty = Pi settings default",
            "type": "string"
          },
          "prompt": {
            "description": "The user prompt for this turn",
            "type": "string"
          },
          "session_id": {
            "description": "iii session id; reuse to resume the same Pi conversation",
            "type": "string"
          },
          "thinking_level": {
            "description": "Reasoning depth for this turn",
            "enum": [
              "off",
              "minimal",
              "low",
              "medium",
              "high",
              "xhigh"
            ],
            "type": "string"
          },
          "timeout_ms": {
            "description": "Reserved for callers; not forwarded",
            "exclusiveMinimum": 0,
            "maximum": 9007199254740991,
            "type": "integer"
          },
          "tools": {
            "description": "Tool allowlist; empty = Pi defaults (read, bash, edit, write)",
            "items": {
              "type": "string"
            },
            "type": "array"
          }
        },
        "type": "object"
      },
      "response_schema": {
        "additionalProperties": false,
        "properties": {
          "busy": {
            "type": "boolean"
          },
          "is_error": {
            "type": "boolean"
          },
          "num_turns": {
            "type": "number"
          },
          "pi_session_id": {
            "anyOf": [
              {
                "type": "string"
              },
              {
                "type": "null"
              }
            ]
          },
          "reason": {
            "type": "string"
          },
          "result": {
            "type": "string"
          },
          "session_id": {
            "type": "string"
          },
          "stop_reason": {
            "type": "string"
          },
          "total_cost_usd": {
            "type": "number"
          },
          "usage": {
            "anyOf": [
              {
                "additionalProperties": false,
                "properties": {
                  "cache_read_tokens": {
                    "type": "number"
                  },
                  "cache_write_tokens": {
                    "type": "number"
                  },
                  "input_tokens": {
                    "type": "number"
                  },
                  "output_tokens": {
                    "type": "number"
                  }
                },
                "required": [
                  "input_tokens",
                  "output_tokens"
                ],
                "type": "object"
              },
              {
                "type": "null"
              }
            ]
          }
        },
        "required": [
          "session_id"
        ],
        "type": "object"
      }
    }
  ],
  "triggers": []
}
```