planner

A process for researching a coding task and producing a phased implementation plan for a bug, feature, or other change.

In plain words
What is it for?
Use it to investigate a codebase, clarify scope and constraints, review related technologies, and organize the work into execution phases.
Why use it?
It helps uncover requirements, risks, dependencies, and testing needs before implementation begins.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/pridees/skillforce/planner
Any agent
npx skills add pridees/skillforce --skill planner
Clone the repo
git clone --depth 1 https://github.com/pridees/skillforce

Made for: Claude Code, Codex.

Per session 56 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,033 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00056 $0.01033
Opus 5 $0.00028 $0.00517
Sonnet 5 $0.00011 $0.00207
Haiku 4.5 $0.00006 $0.00103

Measured 2d ago against content hash aaa01230ec69, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

planner scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/planner/SKILL.md · 158 lines

How it starts

The opening of the file, as written. The whole thing — 158 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Planner Agent

Create detailed, phased implementation plans for bugs, features, or tasks.

Process

Phase 0: Research

  1. Investigate the codebase:

    • Architecture and patterns
    • Similar existing implementations
    • Dependencies and frameworks
    • Related components
  2. Analyze the request:

    • Core requirements
    • Challenges & edge cases
    • Security/performance/UX considerations

Phase 1: Clarify Requirements

Before doing ANY documentation search: clarify requirements with user. This will narrow and aid you in finding the right docs.

Think of 5-10 questions that will help you generate the best plan possible.

Here are suggested example categories, but not a strict or exhaustive list. You may ask anything helpful. Use best judgement & prioritize ambiguity and risk reduction:

  1. Goals & success criteria
  2. Scope & non‑goals
  3. Users & core workflows
  4. Platforms & environments
  5. Tech constraints
  6. Data & integrations
  7. Auth & permissions
  8. Performance & reliability
  9. Testing & validation
  10. Ask any helpful question

Phase 2: Retrieve Documentation

When the plan involves any external library, API, framework, or service, use the Context7 skill to fetch the latest official docs before drafting tasks. This ensures version‑accurate steps, correct parameters, and current best practices. If no external dependencies apply, skip this phase.

Phase 3: Create Plan

Structure
  • Overview: Brief summary and approach
  • Sprints: Logical phases that build on each other
  • Tasks: Specific, actionable items within sprints
Sprint Requirements

Each sprint must:

  • Result in demoable, runnable, testable increment
  • Build on prior sprint work
  • Include demo/verification checklist
Task Requirements

Each task must be:

  • Atomic and committable (small, independent)
  • Specific with clear inputs/outputs
  • Independently testable
  • Include file paths when relevant
  • Include dependencies for parallel execution
  • Include tests or validation method

Read the full file on GitHub · 158 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 158 lines · 56 tokens per session scan A aaa01230ec69

Subscribe to this mod's changes

planner is a skill published in the GitHub repository pridees/skillforce (5 stars, last pushed 2mo ago), licensed MIT. It adds 56 tokens to every session and 1,033 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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