spec-planner

spec-planner is a skill for Claude Code, Codex from KaydenClark/LLM_Workbench. It costs 23 tokens per session (1,022 once invoked), scanned A, original, MIT.

A planning role for breaking one defined project specification into small tasks and parallel implementation slices. It works from the project's current recorded state and hands the plan to the person managing execution.

In plain words
What is it for?
Use it at the start of a project flight to identify task boundaries, dependencies, blockers, and parallel work for one specification.
Why use it?
It turns a broad specification into an executable plan without inventing authority or work outside the assigned scope. This makes dependencies and support work clearer before execution starts.

Skill for Claude CodeCodex

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

Good fit Use it at the start of a project flight to identify task boundaries, dependencies, blockers, and parallel work for one specification.

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Install with agentmods
npx agentmods add skills/kaydenclark/llm_workbench/spec-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 KaydenClark/LLM_Workbench --skill spec-planner
Clone the repo
git clone --depth 1 https://github.com/KaydenClark/LLM_Workbench

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-planner

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

Your own site · 80×15
<a href="https://agentmods.dev/skills/kaydenclark/llm_workbench/spec-planner"><img src="https://agentmods.dev/badge/skills/kaydenclark/llm_workbench/spec-planner.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 23 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,022 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 $0.00023 $0.01022
Opus 5.5 $0.00009 $0.00409
Sonnet 5.5 $0.00005 $0.00204
Haiku 4.5 $0.00002 $0.00102

Measured 12d ago against content hash a400ad1cc174, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

spec-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 12d 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.

workbench/skills/spec-planner/SKILL.md · 89 lines

How it starts

The opening of the file, as written. The whole thing — 89 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Spec Planner

Purpose

Plan small Tasks and parallel vertical slices for the one assigned Spec from current Actuality when its flight launches, and hand the executable plan to Spec Manager.

Adopt only the stance already set in the assigned SPEC and TASK. It is composed with an already assigned Dispatcher role (the dispatcher skill): the role supplies the scope (one Spec and its branch) and the dispatch responsibility; this stance supplies the planning method and obligations. A stance never grants, removes, or transfers authority: the owner request, Workbench controls, repository permissions and governing context establish it first. Loading this skill never spawns an agent. Changing stance alone creates no handoff; continuation uses the existing Workbench owners when execution crosses a meaningful boundary. Do not choose or record a new normal stance or invent a next task. Troubleshooting stance selection is outside this skill. The accepted role model is workbench/docs/adr/000P-roles-scope-work-and-stances-define-the-job.md and workbench/wiki/design-concepts/roles-and-stances.md.

Method / Posture

Resolve the assigned Spec and support lanes through workbench/manifest.json. Plan only at flight launch or Spec activation, and only for the assigned Spec. Never enumerate execution Tasks when merely authoring a planned Spec: a planned Spec gets no Tasks until the same request activates it.

Before cutting anything, inspect live Actuality: the Spec's accepted requirements, decisions and acceptance lines, the source and tests they cite at the current integration tip, the remaining gaps its evidence log records, and its dependencies on other Specs. Plan from what is verified now, not from the Spec's original assumptions; record what was inspected and at which commit.

Cut small complete-path vertical slices with tracer-bullet discipline: each Task pierces every layer its acceptance line needs and finishes in one Chat. Give every Task explicit acceptance (the Spec lines it satisfies), the proof it must produce, its dependencies (Blockers holds only S-###/TK-### ids) and one named writer per shared file. State which groups may run concurrently within the Spec and which wait on others; serialize conflicting writes under the named writer rather than splitting one file between Tasks.

Read the full file on GitHub · 89 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. 12d ago First seen · 89 lines · 23 tokens per session scan A a400ad1cc174

Subscribe to this mod's changes

spec-planner is a skill published in the GitHub repository KaydenClark/LLM_Workbench (2 stars, last pushed 2d ago), licensed MIT. It adds 23 tokens to every session and 1,022 once invoked, about $0.0001 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 2026-10-07.