deadfish-planning - SKILL.md Agent Skill

name: deadfish-planning description: Spec, plan, and task packet formats. GSD rules. Drift detection.

deadfish-planning — Spec + Plan + Task Packets

GSD Rules (Get Shit Done)

Plans-as-prompts: TASK SUMMARY field IS the implementation prompt. No transformation.
Aggressive atomicity: 2-5 tasks per track, ≤200 diff lines each, ≤5 files per task.
Every SPEC AC in exactly one task: No gaps, no duplicates.
Context budget: files_to_load ≤3000 tokens per task packet.
Dependency-change pairing: If a task changes dependency manifests or lockfiles, that same task packet MUST include docs/living/TECH_STACK.md in ## FILES and update it in-task.

SPEC Format

Write to tracks/{track_id}/SPEC.md:

Goal + non-goals
Constraints
Acceptance Criteria (numbered: AC-01, AC-02...)
Each AC tagged DET (deterministic, testable) or LLM (requires judgment)
Edge cases
Out of scope

PLAN Sentinel

```deadfish:PLAN
track_id: auth
base_commit: abc1234
tasks:
  - id: T01
    title: "Set up auth module"
    depends_on: []
    packet_path: tracks/auth/TASKS/T01.md
  - id: T02
    title: "Implement JWT generation"
    depends_on: [T01]
    packet_path: tracks/auth/TASKS/T02.md
```

Task Packet Format

Write each to tracks/{track_id}/TASKS/{task_id}.md: Use canonical YAML list entries in ## FILES; do not use pipe-delimited path: x | action: y lines.

# {TASK_ID}: {TITLE}

## GOAL
{What this task accomplishes — 1-2 sentences}

## ACCEPTANCE_CRITERIA
- AC-01 (DET): {criterion from SPEC}
- AC-03 (LLM): {criterion from SPEC}

## FILES
- path: src/auth/jwt.ts
  action: add
  rationale: new JWT module
- path: tests/auth/jwt.test.ts
  action: add
  rationale: test coverage

## COMMANDS
- npm test
- npm run lint

## SUMMARY
{2-3 imperative sentences. THIS IS the Codex implementation prompt. Be specific.}

## ESTIMATED_DIFF
~80 lines

## RISKS
- {what could go wrong}

## ROLLBACK
- git revert {task commit}

Drift Detection

When base_commit from PLAN ≠ current HEAD:

Check if planned file paths still exist
Check if interfaces changed
If cosmetic: CONTINUE (adapt bindings)
If structural: REPLAN
Acceptance criteria NEVER change on drift — only bindings adapt.

Dependency Manifest Guard

When composing ## FILES, treat dependency manifests/lockfiles as a special planning trigger.

If any task includes a dependency manifest or lockfile (for example package.json, package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, pyproject.toml, poetry.lock, Pipfile.lock, go.mod, go.sum, Cargo.toml, Cargo.lock):

include docs/living/TECH_STACK.md in the same task packet ## FILES
set it to action: modify
state rationale as dependency/version update traceability
require TASK ## SUMMARY to explicitly say TECH_STACK is updated in-task