ship-spec

ship-spec is a skill for Claude Code, Codex from Acendas/shipyard. It costs 13 tokens per session (5,826 once invoked), scanned A, original, MIT.

A tool for viewing, searching, and managing a product specification. A product specification is the shared document that describes what a product or feature should do.

In plain words
What is it for?
Use it to browse or search the specification, manage features and backlog entries, rank work, and update feature status.
Why use it?
It helps keep feature details, backlog items, priorities, and project decisions organized in one workflow. It also adds checks before asking the user to choose between options.

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 shipyard plugin — 32 skills, 7 agents, 4 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/acendas/shipyard/ship-spec
Any agent
npx skills add Acendas/shipyard --skill ship-spec
Clone the repo
git clone --depth 1 https://github.com/Acendas/shipyard

Made for: Claude Code, Codex.

Or install shipyard, the plugin that ships this one along with the rest of its 32 skills, 7 agents, 4 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 ship-spec

README.md
[![agentmods](https://agentmods.dev/badge/skills/acendas/shipyard/ship-spec.svg)](https://agentmods.dev/skills/acendas/shipyard/ship-spec)
Your own site
<a href="https://agentmods.dev/skills/acendas/shipyard/ship-spec"><img src="https://agentmods.dev/badge/skills/acendas/shipyard/ship-spec.svg" alt="Measured on agentmods" height="20"></a>
Per session 13 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 5,826 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 $0.00013 $0.05826
Opus 5 $0.00006 $0.02913
Sonnet 5 $0.00003 $0.01165
Haiku 4.5 $0.00001 $0.00583

Measured 4d ago against content hash 359761beb4d8, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

ship-spec 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.

plugins/shipyard/skills/ship-spec/SKILL.md · 381 lines

How it starts

The opening of the file, as written. The whole thing — 381 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Shipyard: Spec Manager

Browse, search, and manage the product specification.

Context

!shipyard-context spec-context

Paths. All file ops use the absolute SHIPYARD_DATA prefix from the context block. No ~, $HOME, or shell variables in file_path. Bash is for shipyard-context (reads) and shipyard-data feature|backlog|idea ... (state mutations) ONLY — no other shell. Never use echo/printf/shell redirects to write state files — use the Write tool (auto-approved for SHIPYARD_DATA). Never hand-Edit feature-file frontmatter or BACKLOG.md IDs/last_groomed — those are CLI-owned (feature set, feature set-status, backlog add|remove|rank|set). Feature/epic bodies and the BACKLOG.md Overrides section remain Edit-tool surface.

Onboarding gate. If the bundled context contains SHIPYARD_ONBOARDING_REQUIRED=true, run the exact SHIPYARD_ONBOARDING_COMMAND once with Bash, report the CLI output to the user, and STOP. Do not infer setup state by reading or writing Shipyard state files; onboarding decisions are CLI-owned.

Render before asking. Before every AskUserQuestion, render the decision context — the scenarios, concrete examples, tradeoffs, and any verbatim content being approved — as chat text; the tool call then carries only the short question and option labels. A bare AskUserQuestion with no rendered context above it is a bug (the window is too small to carry a real decision). Content that exists only in a Read result, a subagent/Agent return, a dossier file, or the question/option strings themselves does not count as rendered (the UI shows a compact card) — restate it as assistant chat text immediately above the ask.

Input

$ARGUMENTS

Behavior

No arguments → Interactive Spec Browser

Start an interactive browsing session. Show the top level and let the user drill down.

Level 1: Spec Overview

Read all spec files and present:

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
 SPEC — [Project Name]
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

 EPICS
  [1] E001: [title]
      [████████░░] 80% | 4/5 features done | 24/30 pts
  [2] E002: [title]
      [███░░░░░░░] 30% | 1/3 features done | 5/18 pts

 UNGROUPED FEATURES
  [3] F007: [title] — [status] | [pts] pts
  [4] F012: [title] — [status] | [pts] pts

 COMPLETION
  Overall: [████████░░] [N]% | [done pts]/[total pts] story points
  By status: [N] proposed → [N] approved → [N] in-progress → [N] done → [N] released
  Bugs: [N] open | Ideas: [N] pending

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Read the full file on GitHub · 381 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 · 381 lines · 13 tokens per session scan A 359761beb4d8

Subscribe to this mod's changes

ship-spec is a skill published in the GitHub repository Acendas/shipyard (2 stars, last pushed 22d ago), licensed MIT. It adds 13 tokens to every session and 5,826 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.

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