pi-fable

Fable-style disciplined workflow for pi — goal ledger, findings gate, evidence-based verification.

Adapted from FableCodex for the pi coding agent.

What it does

pi-fable enforces a structured, evidence-based workflow when you're tackling multi-step, risky, or review-sensitive tasks. It adds:

• Goal ledger — break tasks into trackable goals with evidence checkpoints
• Findings gate — track review issues and block completion until they're resolved
• Verification enforcement — final goals require proof (tests, lint, screenshots, etc.)
• State persistence — workflow state survives across turns in .fablecodex/

Installation

npm (recommended)

pi install npm:pi-fable

Git

pi install git:github.com/user/pi-fable

Local

pi install /path/to/pi-fable

Quick test

pi -e ./extensions/fable.ts

Usage

Start a workflow

Type /fable followed by a description of your task:

/fable Add CSV import to the data pipeline

This auto-creates a 3-goal starter plan:

G001 [active] inspect
  Objective: Explore the workspace, understand current state...
G002 [pending] implement
  Objective: Make the necessary changes to complete...
G003 [pending] verify
  Objective: Run tests, lint, typecheck... Provide verification command and output as evidence.

G001 activates immediately — the agent starts inspecting your workspace.

Manual goal management

Use the fable_goals tool for full control:

fable_goals action=create brief="Add CSV import" goals=[
  { title: "inspect", objective: "Find current import flow and tests" },
  { title: "implement", objective: "Add CSV parser and UI path" },
  { title: "verify", objective: "Run tests and a sample import" }
]

Advance to the next goal:

fable_goals action=next

Complete a goal with evidence:

fable_goals action=checkpoint goalId=G001 status=complete evidence="Read importer.ts and import.test.ts"

Final goal requires verification:

fable_goals action=checkpoint goalId=G003 status=complete evidence="Ran full test suite" verifyCmd="npm test" verifyEvidence="all tests passed"

Check progress:

fable_goals action=status

Track findings

Use the fable_findings tool to track issues found during work:

fable_findings action=add title="Missing error handling for empty CSV" severity=high evidence="importer.ts doesn't handle empty files"

Review open findings:

fable_findings action=next

Resolve a finding with verification:

fable_findings action=resolve findingId=F001 evidence="Added empty file check in importer.ts" verifyEvidence="import empty.csv returns graceful error"

Run the findings gate (blocks final goal if issues remain):

fable_findings action=gate

Reset

Clear all state and start fresh:

fable_reset

How it works

Command

Command	Description
/fable [brief]	Activate workflow and auto-create a starter plan

Tools

Tool	Description
fable_goals	Create, advance, checkpoint, and status-check the goal ledger
fable_findings	Add, list, advance, resolve, reject, gate-check, and status-check findings
fable_reset	Clear all workflow state

Workflow loop

/fable <task>
    │
    ▼
┌─────────────┐
│   Inspect   │ ← Explore workspace, understand current state
└──────┬──────┘
       │
       ▼
┌─────────────┐
│  Implement  │ ← Make changes, track findings
└──────┬──────┘
       │
       ▼
┌─────────────┐
│   Verify    │ ← Run tests, lint, typecheck → provide evidence
└──────┬──────┘
       │
       ▼
┌─────────────┐
│ Findings    │ ← Gate: no blocking findings allowed
│ Gate        │
└──────┬──────┘
       │
       ▼
     Done

State storage

All workflow state is stored in .fablecodex/ in your project root:

File	Purpose
goals.json	Current goal plan and progress
findings.json	Review findings ledger
ledger.jsonl	Append-only event history

Do not commit .fablecodex/ unless you explicitly want to.

Features

• Auto-create starter plans — /fable <brief> generates inspect → implement → verify goals
• Evidence-based checkpoints — every goal completion requires concrete evidence
• Findings gate — final goal cannot complete while blocking findings remain
• Severity-sorted findings — critical issues surface first
• State persistence — resume workflows across turns
• Status bar — footer shows active Fable workflow
• System prompt injection — agent receives Fable workflow instructions when active

License

AGPL-3.0-or-later — same as FableCodex.