spec-walkthrough

spec-walkthrough is a skill for Claude Code, Codex from inkatze/planwright. It costs 100 tokens per session (2,480 once invoked), scanned A, original, MIT.

A read-only tool that turns a software specification bundle into a self-contained HTML explanation. It uses plain language to show the requirements, decisions, dependencies, and task plan.

In plain words
What is it for?
Use it to review the whole specification or selected parts, such as one requirement group, decision, file, or dependency graph.
Why use it?
It helps people understand a dense specification before work begins, during development, or when joining an existing project without changing the specification.

Skill for Claude CodeCodex

Installs and runs on its own, but its text points at files inside its plugin — anything it tells you to read at a ${CLAUDE_PLUGIN_ROOT} path is only there once the plugin is installed. Installing the plugin gets both.

Part of the planwright plugin — 11 skills, 9 hooks shipped together

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/inkatze/planwright/spec-walkthrough
Any agent
npx skills add inkatze/planwright --skill spec-walkthrough
Clone the repo
git clone --depth 1 https://github.com/inkatze/planwright

Made for: Claude Code, Codex.

Or install planwright, the plugin that ships this one along with the rest of its 11 skills, 9 hooks.

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-walkthrough

README.md
[![agentmods](https://agentmods.dev/badge/skills/inkatze/planwright/spec-walkthrough.svg)](https://agentmods.dev/skills/inkatze/planwright/spec-walkthrough)
Your own site
<a href="https://agentmods.dev/skills/inkatze/planwright/spec-walkthrough"><img src="https://agentmods.dev/badge/skills/inkatze/planwright/spec-walkthrough.svg" alt="Measured on agentmods" height="20"></a>
Per session 100 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,480 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 $0.00100 $0.02480
Opus 5 $0.00050 $0.01240
Sonnet 5 $0.00020 $0.00496
Haiku 4.5 $0.00010 $0.00248

Measured 4d ago against content hash d6153e35412b, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

spec-walkthrough 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 4d 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-walkthrough/SKILL.md · 175 lines

How it starts

The opening of the file, as written. The whole thing — 175 lines — stays where its author put it; the contents beside it link to each section on GitHub.

/spec-walkthrough

A standalone, read-only command that renders an existing spec bundle, or a selected part of it, into a visual, plain-English artifact a human reads and judges for themselves (REQ-A1.1, D-1). It lowers the cost of absorbing a dense bundle so a reader can independently evaluate it at any lifecycle stage, and it stands apart from /spec-kickoff precisely so that read stays independent: the moment the authoring agent performs the comprehension, independent review collapses into "the agent reviewed its own spec."

On a successful load the command assembles the bundle into a single self-contained HTML file and writes it to the gitignored .claude/walkthroughs/<spec>/ location (REQ-E1.1), naming the path in the load report. The artifact carries the one-pager, the decision map, the drawn dependency graph, and the teach-back; a partial --scope selector renders only the sections in its scope (a single file, a requirement group, the decision set, the task graph, or one decision plus its blast radius), and the framing adapts to the bundle's auto-detected status (REQ-B1.2, REQ-B1.3).

Doctrine

Resolve and read these rule docs at run start via the rule-doc resolution convention (scripts/resolve-rule-doc.sh <doc-name>, or the documented PLANWRIGHT_ROOT/CLAUDE_PLUGIN_ROOT chain): spec-format (the bundle this command reads conforms to the meta-spec — its file set, headers, and identifier discipline govern what the scaffold loads and validates) and security-posture (the identifier-charset and path-containment rules the scaffold enforces before any read, and the data-hygiene rule for anything it later writes). Their definitions govern wherever this skill names a concept. If one does not resolve, halt with a clear message naming the missing doc and the chain consulted (REQ-K1.7: a clear message is the graceful arm; proceeding without doctrine is the opaque failure).

Doctrine manifest (the reading model above in machine-parseable form, per doctrine/instruction-hygiene.md; run-start loads before work begins):

Read the full file on GitHub · 175 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. 4d ago First seen · 175 lines · 100 tokens per session scan A d6153e35412b

Subscribe to this mod's changes

spec-walkthrough is a skill published in the GitHub repository inkatze/planwright (3 stars, last pushed today), licensed MIT. It adds 100 tokens to every session and 2,480 once invoked, about $0.0005 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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