to-spec

to-spec is a skill for Claude Code, Codex from OutlineDriven/odin-claude-plugin. It costs 58 tokens per session (1,106 once invoked), scanned A, original, Apache-2.0.

A workflow for turning agreed project decisions into a detailed implementation specification saved in the repository. It records the problem, proposed behavior, tests, decisions, and exclusions for another agent to follow.

In plain words
What is it for?
Use it after requirements are settled and before handing implementation work to an agent.
Why use it?
It prevents important decisions from being lost between discussion and implementation. It also makes the expected result and boundaries explicit.

Skill for Claude CodeCodex

Written for Claude Code and Codex: shipped in a Claude Code plugin, but also agents/openai.yaml present.

Part of the odin-code plugin — 60 skills shipped together

Good fit Use it after requirements are settled and before handing implementation work to an agent.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/outlinedriven/odin-claude-plugin/to-spec
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 OutlineDriven/odin-claude-plugin --skill to-spec
Clone the repo
git clone --depth 1 https://github.com/OutlineDriven/odin-claude-plugin

Made for: Claude Code, Codex.

Or install odin-code, the plugin that ships this one along with the rest of its 60 skills.

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 to-spec

README.md
[![agentmods](https://agentmods.dev/badge/skills/outlinedriven/odin-claude-plugin/to-spec/github.svg)](https://agentmods.dev/skills/outlinedriven/odin-claude-plugin/to-spec)
Your own site
<a href="https://agentmods.dev/skills/outlinedriven/odin-claude-plugin/to-spec"><img src="https://agentmods.dev/badge/skills/outlinedriven/odin-claude-plugin/to-spec/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 to-spec

Your own site · 80×15
<a href="https://agentmods.dev/skills/outlinedriven/odin-claude-plugin/to-spec"><img src="https://agentmods.dev/badge/skills/outlinedriven/odin-claude-plugin/to-spec.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 58 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,106 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. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
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 $0.00058 $0.01106
Opus 5 $0.00029 $0.00553
Sonnet 5 $0.00012 $0.00221
Haiku 4.5 $0.00006 $0.00111

Measured 5d ago against content hash d61b2fe424b1, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

to-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 5d 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/odin-code/skills/to-spec/SKILL.md · 104 lines

How it starts

The opening of the file, as written. The whole thing — 104 lines — stays where its author put it; the contents beside it link to each section on GitHub.

To spec

Contract

Field Bound contract
Trigger Settled decisions need synthesis into an implementation spec.
Authority Reversible local: write only a named local spec file; the rollback path is deleting that file.
Side effect Writes an agent-ready specification file locally and stops before publishing or distributing it; a human performs any publication.
Done Problem, solution, stories, decisions, tests, and exclusions are agent-ready in a verified local specification file; publication remains an unexecuted human handoff.

Inputs

  • Conversation context. The current conversation must contain settled decisions: what is being built, why, and how completion will be judged. If the conversation lacks settled decisions, stop and state what is missing.
  • Codebase state. Explore the repository to understand the current state. Use the project's domain glossary vocabulary throughout the spec and respect any ADRs in the area being touched.
  • Optional: CONTEXT.md or domain docs. If present, read them for vocabulary and constraints. Do not require them.

Refusals

  • Will not interview the user or open a new round of questioning — synthesize what has already been decided.
  • Will not fabricate decisions or fill gaps with assumptions.
  • Will not publish, distribute, or assign labels — publication is a human handoff.
  • Will not proceed to spec writing until the user confirms the identified seams.

Procedure

  1. Explore the repository to understand the current state of the codebase if not already done. Identify the project's domain vocabulary and any ADRs in the relevant area. Done when: the codebase state and domain vocabulary are understood.
  2. Identify the seams at which the feature will be tested. Prefer existing seams to new ones, and use the highest existing seam possible. If a new seam is needed, propose it at the highest practical point. Fewer seams across the codebase are better; the ideal number is one. Done when: the testing seams are identified.
  3. Present the identified seams to the user and confirm they match expectations. Do not proceed until the user confirms. Done when: the user confirms the seams.
  4. Synthesize the spec from the conversation context, codebase understanding, and confirmed seams. Do not interview the user or open a new round of questioning. Capture what has already been decided. Done when: the spec content is synthesized from settled decisions.
  5. Write the spec to docs/specs/<feature-slug>-spec.md using the template below. Done when: the spec file is written to disk.
  6. Verify the written file contains all seven sections populated with substantive content. If any section is empty or stubbed, fill it before declaring done. Done when: all seven sections are substantive.
  7. Stop. Do not publish, distribute, or assign labels. Report the file path and that publication is a human handoff. Done when: the file path is reported and no publication action is taken.

Read the full file on GitHub · 104 lines

Files

What ships with it

1 file 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. 5d ago First seen · 104 lines · 58 tokens per session scan A d61b2fe424b1

Subscribe to this mod's changes

to-spec is a skill published in the GitHub repository OutlineDriven/odin-claude-plugin (35 stars, last pushed 2d ago), licensed Apache-2.0. It adds 58 tokens to every session and 1,106 once invoked, about $0.0003 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 2026-09-04.

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