spec-driven-planner

spec-driven-planner is a skill for Claude Code, Codex from lindoelio/spec-driven-steroids. It costs 79 tokens per session (732 once invoked), scanned A, original, MIT.

A process for planning and carrying out approved software changes through a written specification. It chooses between a short brief and a fuller set of requirements, design, task, review, and approval steps.

In plain words
What is it for?
Use it to gather evidence, choose a planning path, write and validate the plan, obtain approval, and guide implementation and review.
Why use it?
It prevents coding from starting with unclear scope and preserves human approval and safety checks throughout the work.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: mentions subagents.

Good fit Use it to gather evidence, choose a planning path, write and validate the plan, obtain approval, and guide implementation and review.

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Install with agentmods
npx agentmods add skills/lindoelio/spec-driven-steroids/spec-driven-planner
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 lindoelio/spec-driven-steroids --skill spec-driven-planner
Clone the repo
git clone --depth 1 https://github.com/lindoelio/spec-driven-steroids

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-driven-planner

README.md
[![agentmods](https://agentmods.dev/badge/skills/lindoelio/spec-driven-steroids/spec-driven-planner/github.svg)](https://agentmods.dev/skills/lindoelio/spec-driven-steroids/spec-driven-planner)
Your own site
<a href="https://agentmods.dev/skills/lindoelio/spec-driven-steroids/spec-driven-planner"><img src="https://agentmods.dev/badge/skills/lindoelio/spec-driven-steroids/spec-driven-planner/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-driven-planner

Your own site · 80×15
<a href="https://agentmods.dev/skills/lindoelio/spec-driven-steroids/spec-driven-planner"><img src="https://agentmods.dev/badge/skills/lindoelio/spec-driven-steroids/spec-driven-planner.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 79 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 732 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 $0.00079 $0.00732
Opus 5.5 $0.00032 $0.00293
Sonnet 5.5 $0.00016 $0.00146
Haiku 4.5 $0.00008 $0.00073

Measured 2d ago against content hash 8a373c9b9b46, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

spec-driven-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.

packages/cli/templates/universal/skills/spec-driven-planner/SKILL.md · 48 lines

How it starts

The opening of the file, as written. The whole thing — 48 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Spec-Driven Planner

This skill is the authoritative orchestration contract, whether invoked directly, through a command, or through a native agent. Entry points only route here. If their instructions conflict with this skill, follow this skill; never weaken human approval or the host's safety permissions.

Lane Selection

Read references/lane-selection.md before selecting, resuming, or changing a lane. It is the single source for selection precedence, escalation criteria, slicing, and lane transitions. Do not infer the lane from a keyword, file count, or task count.

Brief Lane

Brief is the default. Invoke the spec-driven-brief-planner skill directly; no native agent or sub-agent capability is required. It owns the compact artifact, evidence, approval, execution, and review contract.

Full Lane

When full is selected, read references/full-lane-phases.md and invoke the phase skills in order. It owns the full lifecycle, phase approvals, stop rule, discovery, Red Team Review, and Code Review. Do not load the full lifecycle merely to execute a brief.

No Direct Lane

This toolkit has no direct lane. Direct execution without a planning artifact belongs to the host harness outside SDS. Treat lane:direct as invalid rather than bypassing approval.

Shared Protocol

The spec-driven-shared-protocol skill supplies context-preflight, validation commands, and the Unified Quality Gate. Phase skills own their document formats and local quality checks. Do not copy their contracts into entry points.

Approval And Resumption

  • Every lane must write and validate its planning artifact, then stop for explicit human approval before implementation.
  • Choosing a lane, requesting a full spec, or approving a transition is not approval to implement it.
  • Before approval, do not edit implementation files. Write only the active lane's planning artifacts; archive prior artifacts only during an explicitly approved lane transition.
  • Resume the approved artifact and current working-tree state, not recollection. If approval cannot be established from the conversation or a trustworthy persisted record, ask instead of inferring it from the file's existence or task markers.
  • Material changes to behavior, scope, contracts, architecture, or risk require renewed review and approval. Implementation details within an approved scope may be amended under the active skill's protocol.
  • Full-lane phase transitions require explicit human approval. Their Non-Skippable Stop Rule is defined in references/full-lane-phases.md.

Read the full file on GitHub · 48 lines

Files

What ships with it

2 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. 2d ago First seen · 48 lines · 0 tokens per session scan A 8a373c9b9b46

Subscribe to this mod's changes

spec-driven-planner is a skill published in the GitHub repository lindoelio/spec-driven-steroids (54 stars, last pushed 3d ago), licensed MIT. It adds 79 tokens to every session and 732 once invoked, about $0.0003 per session on Opus 5.5. 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 2026-10-25.