spec-plan

spec-plan is a skill for Claude Code, Codex from ronronner02/codepilot-agent. It costs 86 tokens per session (24,042 once invoked), scanned A, original, MIT.

A workflow for turning requirements, bug reports, research, or rough ideas into an evidence-based technical plan. It focuses on deciding how to build the agreed outcome without implementing it.

In plain words
What is it for?
Use it to create or deepen plans for multi-step software work, including architecture, execution details, and research-backed implementation decisions.
Why use it?
It helps resolve uncertain implementation details and leaves behind a durable plan that another developer can follow.

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/ronronner02/codepilot-agent/spec-plan
Any agent
npx skills add ronronner02/codepilot-agent --skill spec-plan
Clone the repo
git clone --depth 1 https://github.com/ronronner02/codepilot-agent

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for spec-plan

README.md
[![agentmods](https://agentmods.dev/badge/skills/ronronner02/codepilot-agent/spec-plan.svg)](https://agentmods.dev/skills/ronronner02/codepilot-agent/spec-plan)
Your own site
<a href="https://agentmods.dev/skills/ronronner02/codepilot-agent/spec-plan"><img src="https://agentmods.dev/badge/skills/ronronner02/codepilot-agent/spec-plan.svg" alt="Measured on agentmods" height="20"></a>
Per session 86 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 24,042 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 $0.00086 $0.24042
Opus 5 $0.00043 $0.12021
Sonnet 5 $0.00017 $0.04808
Haiku 4.5 $0.00009 $0.02404

Measured yesterday against content hash 86c71fa9c2ee, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

spec-plan 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 yesterday.

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.

.claude/spec-first/workflows/spec-plan/SKILL.md · 865 lines

How it starts

The opening of the file, as written. The whole thing — 865 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Create Technical Plan

Note: Use the current date from the active host context. Use this when weighting external sources and dating artifacts.

spec-brainstorm defines WHAT to build by creating a requirements-only unified plan. spec-plan enriches that same artifact with HOW to build it. spec-work executes implementation-ready plans. A prior brainstorm is useful context but never required — spec-plan works from any input: a requirements-only unified plan, a legacy requirements doc, a bug report, a feature idea, or a rough description.

When directly invoked, always plan. Never classify a direct invocation as "not a planning task" and abandon the workflow. If the input is unclear, ask clarifying questions or use the planning bootstrap (Phase 0.4) to establish enough context — but always stay in the planning workflow. Here, "always plan" means entering and remaining in planning evaluation; entering planning evaluation does not promise an implementation-ready output. A blocked checkpoint or producer handoff is a valid outcome while product blockers remain.

This workflow produces a durable implementation plan. It does not implement code, run tests, or learn from execution-time results. If the answer depends on changing code and seeing what happens, that belongs in spec-work, not here.

Workflow Contract Summary

  • Input: A requirements-only unified plan, legacy requirements, a bug or feature description, an existing plan, or an explicit answer-seeking objective.
  • Output: An implementation-ready unified plan, the corresponding non-code or answer-seeking artifact, or a blocked checkpoint / producer handoff that preserves unresolved product questions.
  • Hard exits: While WHAT is unsettled, the target repo or source owner is unclear, a load-bearing architecture or acceptance decision is unconfirmed, artifact metadata is invalid, or the user has not selected the owning handoff, do not modify the artifact to promote it to implementation-ready, generate Implementation Units or an implementation handoff, or enter implementation.
  • Authority: The Product Contract owns WHAT; current source and evidence constrain HOW; the LLM makes architecture judgments while scripts only prepare facts. Planning does not authorize code mutation, tests, commits, or landing.
  • Consumers: spec-write-tasks, spec-work, spec-doc-review, human reviewers, and caller-owned pipelines.

Read the full file on GitHub · 865 lines

Files

What ships with it

29 files 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. yesterday First seen · 865 lines · 86 tokens per session scan A 86c71fa9c2ee

Subscribe to this mod's changes

spec-plan is a skill published in the GitHub repository ronronner02/codepilot-agent (0 stars, last pushed 3d ago), licensed MIT. It adds 86 tokens to every session and 24,042 once invoked, about $0.0004 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 2026-09-03.

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