spec-to-plan

spec-to-plan is a skill for Claude Code, Codex from kambleakash0/agent-skills. It costs 21 tokens per session (1,246 once invoked), scanned A, original, MIT.

A planning method that turns a product requirements document, or PRD, into a phased implementation plan. It uses tracer-bullet slices, meaning small end-to-end pieces that prove the main path early.

In plain words
What is it for?
Use it after requirements are defined to map user stories, features, constraints, and non-goals into phases. The resulting Markdown plan can guide later implementation and test-driven work.
Why use it?
It makes a large specification easier to sequence and reduces the risk of planning isolated components that do not work together. It also shows what can wait until later.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it after requirements are defined to map user stories, features, constraints, and non-goals into phases. The resulting Markdown plan can guide later implementation and test-driven work.

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Install with agentmods
npx agentmods add skills/kambleakash0/agent-skills/spec-to-plan
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.

Any agent
npx skills add kambleakash0/agent-skills --skill spec-to-plan
Clone the repo
git clone --depth 1 https://github.com/kambleakash0/agent-skills

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-to-plan

README.md
[![agentmods](https://agentmods.dev/badge/skills/kambleakash0/agent-skills/spec-to-plan/github.svg)](https://agentmods.dev/skills/kambleakash0/agent-skills/spec-to-plan)
Your own site
<a href="https://agentmods.dev/skills/kambleakash0/agent-skills/spec-to-plan"><img src="https://agentmods.dev/badge/skills/kambleakash0/agent-skills/spec-to-plan/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for spec-to-plan

Your own site · 80×15
<a href="https://agentmods.dev/skills/kambleakash0/agent-skills/spec-to-plan"><img src="https://agentmods.dev/badge/skills/kambleakash0/agent-skills/spec-to-plan.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 21 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,246 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00021 $0.01246
Opus 5 $0.00010 $0.00623
Sonnet 5 $0.00004 $0.00249
Haiku 4.5 $0.00002 $0.00125

Measured 11d ago against content hash 0946f517fc8a, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

spec-to-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 11d 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/spec-to-plan/SKILL.md · 148 lines

How it starts

The opening of the file, as written. The whole thing — 148 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Turn a PRD into an Implementation Plan

This skill translates what needs to be built (the PRD) into how it will be built (a phased implementation plan). It breaks the PRD into tracer-bullet vertical slices, orders them into phases, and writes the result as a Markdown plan file in ./plans/.

When to Use

Use this skill when:

  • You already have a PRD or equivalent spec and now need a concrete implementation plan.
  • You want to think in phases, not just issues: what gets built first, what can be deferred, and how slices build on each other.
  • You intend to drive downstream work (e.g. /slice-the-spec, /incremental-tdd) from a single, durable planning document.

If the requirements are still fuzzy, use /grill-me and /spec-writer first.

Workflow

You can compress steps if the context is already clear, but keep the core structure: PRD → slices → phases → plan file.

  1. Confirm the PRD is in context

    • Ensure the PRD is available in the conversation or repo.
    • If not, ask the user to paste it or point you to the file path or issue.
    • Skim for: goals, user stories, functional requirements, non-goals, and constraints.
  2. Explore the codebase (light)

    • If you have not already explored the codebase for this feature, do a quick pass to understand major modules, integration layers, and architectural patterns.
    • Note any constraints that will affect slicing (e.g. existing routing, data models, auth, third-party boundaries).
  3. Identify durable architectural decisions

    Before slicing, identify decisions that are unlikely to change across phases and are worth calling out up front:

    • Route structures / URL patterns.
    • Database schema shape and key tables.
    • Core data models and domain concepts.
    • Authentication / authorization approach.
    • Third‑party service boundaries and integration points.

    These go into the Architectural decisions section of the plan so every phase can reference them.

  4. Draft vertical slices (tracer bullets)

Read the full file on GitHub · 148 lines

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. 11d ago First seen · 148 lines · 21 tokens per session scan A 0946f517fc8a

Subscribe to this mod's changes

spec-to-plan is a skill published in the GitHub repository kambleakash0/agent-skills (9 stars, last pushed 2d ago), licensed MIT. It adds 21 tokens to every session and 1,246 once invoked, about $0.0001 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.