Specification: The Chronicle (agent-workflow)

1. Overview

The Chronicle is a temporal orchestration extension for the Pi Coding Agent. It enables long-running, state-aware workflows that span multiple sessions and personas. Unlike traditional linear agents, The Chronicle manages a formal State Machine where each stage of a project is handled by a specialized agent persona, with the extension acting as a persistent "State Supervisor."

2. Core Architecture

2.1 The Supervisor Model

The Chronicle operates as a non-working supervisor that delegates tasks to worker agents.

The Ledger: A persistent JSON file (.pi/chronicle/sessions/<uuid>.json) that tracks the project state, file snapshots, and transition history.
State Isolation: Each state is executed by a fresh Pi sub-agent process with a specialized system prompt, preventing "persona leakage" and ensuring clean tool contexts.
Context Handover: When transitioning, the Supervisor extracts a "Snapshot" (modified files, key discoveries, pending tasks) and injects it into the next agent's starting context.

2.2 Workflow Definition

Workflows are defined in JSON templates:

{
  "name": "Feature Implementation",
  "states": {
    "planning": {
      "persona": "Software Architect",
      "next": ["implementation"],
      "requires_approval": true
    },
    "implementation": {
      "persona": "Senior Engineer",
      "next": ["verification", "planning"]
    }
  }
}

3. Key Mechanisms

3.1 Explicit Transitions

To ensure reliability, transitions are explicit. The agent must call a tool to signal completion:

workflow_transition(target_state, summary): Finalizes the current state, saves the snapshot, and triggers the supervisor to spawn the next agent.
workflow_update_snapshot(data): Allows agents to "checkpoint" critical findings (e.g., "The API port is 8081, not 8080") that must persist through the entire workflow.

3.2 Temporal Persistence

Checkpointing: Every tool call and state change is logged to the Ledger.
Recovery: If a session is interrupted (e.g., power loss, manual exit), the extension can resume exactly where it left off by reading the Ledger and re-priming the sub-agent.

3.3 TUI Integration (The Timeline)

A dedicated widget displays the project's journey:

Breadcrumbs: Planning [✓] -> Implementation [●] -> Verification [ ].
Metrics: Displays cumulative token usage and time elapsed per state.
Diff View: Shows which files have been modified since the start of the current state.

4. Operational Guardrails

4.1 Anti-Looping

If a workflow transitions between the same states more than 3 times (e.g., Planning -> Implementation -> Planning -> Implementation), the Supervisor forces a transition to a human_intervention state and blocks further automated moves.

4.2 Resource Budgeting

The Supervisor tracks the total cost and token consumption across all sub-agents. It can be configured with hard limits to prevent runaway costs in long-running workflows.

4.3 Cleanup

Each state can define a cleanup routine that the Supervisor executes (e.g., killing background processes) before the next agent is spawned.

5. Integration

The Chronicle integrates with:

agent-team: To fetch specialized personas for specific states.
damage-control: To enforce safety rules across all worker sub-agents spawned by the Supervisor.

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