openspec-propose

openspec-propose is a skill for Claude Code from BuildrAI/Buildr. It costs 47 tokens per session (2,994 once invoked), scanned A, a copy of openspec-propose, MIT.

A command that turns a requested software change into three planning documents: a proposal, a design, and implementation tasks. It is part of OpenSpec, a system for describing and tracking planned changes before coding them.

In plain words
What is it for?
Preparing a complete change proposal, including what should be built, why it is needed, how it should work, and the steps required to implement it.
Why use it?
It gives a vague feature request a written purpose, technical approach, and task list that can be reviewed before implementation.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

Good fit Preparing a complete change proposal, including what should be built, why it is needed, how it should work, and the steps required to implement it.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/buildrai/buildr/openspec-propose
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 BuildrAI/Buildr --skill openspec-propose
Clone the repo
git clone --depth 1 https://github.com/BuildrAI/Buildr

Made for: Claude Code.

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 openspec-propose

README.md
[![agentmods](https://agentmods.dev/badge/skills/buildrai/buildr/openspec-propose/github.svg)](https://agentmods.dev/skills/buildrai/buildr/openspec-propose)
Your own site
<a href="https://agentmods.dev/skills/buildrai/buildr/openspec-propose"><img src="https://agentmods.dev/badge/skills/buildrai/buildr/openspec-propose/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 openspec-propose

Your own site · 80×15
<a href="https://agentmods.dev/skills/buildrai/buildr/openspec-propose"><img src="https://agentmods.dev/badge/skills/buildrai/buildr/openspec-propose.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 47 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,994 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 84% copy Near-identical to another mod 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 $0.00047 $0.02994
Opus 5.5 $0.00019 $0.01198
Sonnet 5.5 $0.00009 $0.00599
Haiku 4.5 $0.00005 $0.00299

Measured 1mo ago against content hash 5060f490a1ed, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

openspec-propose 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 1mo 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.

Origin

This is a copy

84% identical to openspec-propose — 100 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

projects/product/services/buildr/resources/workspace/skills/openspec/openspec-propose/SKILL.md · 164 lines

How it starts

The opening of the file, as written. The whole thing — 164 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Propose a new change - create the change and generate all artifacts in one step.

Planning boundary: This workflow creates planning artifacts only. The user request that selected or triggered this workflow authorizes planning only, even if it asks to build or fix something. Do not edit project code. After the planning artifacts are complete, stop. Do not start implementation in the same response, even if the initial request asks for it. Wait for a new user request after the artifacts are presented; then start the apply workflow.

I'll create a change with the artifacts your schema defines. With the default spec-driven schema that is:

  • proposal.md (what & why)
  • specs/<capability-path>/spec.md (what the system must do - a delta, not the main spec)
  • design.md (how)
  • tasks.md (implementation steps)

<capability-path> is the spec directory relative to specs/ (for example, user-auth or identity/user-auth). Preserve an existing capability's full path and follow the project's established organization for new capabilities.

When the user is ready to implement, they must start the apply workflow explicitly.


Store selection: If the user names a store (a store is a standalone OpenSpec repo registered on this machine) or the work lives in one, run openspec store list --json to discover registered store ids, then pass --store <id> on the commands that read or write specs and changes (new change, status, instructions, list, show, validate, archive, doctor, context, schemas, view). Once selected, treat --store <id> as sticky for the rest of the workflow. Every unscoped example of those commands below is shorthand: before running it, append the flag. For example, run openspec status --change "<name>" --json --store "<id>", not the unscoped form shown below. Other commands do not take the flag. Hints printed by commands already carry the flag; keep it on follow-ups. Without a store, commands act on the nearest local openspec/ root.

Input: The user's request should include a change name (kebab-case) OR a description of what they want to build.

Steps

  1. Understand the request and clarify material ambiguity

    If no clear input is provided, ask the user (open-ended, no preset options):

    "What change do you want to work on? Describe what you want to build or fix."

    From their description, derive a kebab-case name (e.g., "add user authentication" → add-user-auth).

    IMPORTANT: Do NOT proceed without understanding what the user wants to build.

    If the request contains ambiguity that would materially affect scope, externally observable behavior, compatibility, or acceptance criteria, ask the user before creating the change. For minor details, make a reasonable assumption and record it in the planning artifacts.

  2. Load project context

    Run openspec context --json from the current working directory (or openspec context --json --store "<store-id>" when a registered store was explicitly selected). Use the returned root.path as the authoritative OpenSpec root. If context reports no_openspec_root, stop without creating or changing any files. Offer openspec init and wait for the user to request initialization. Do not initialize automatically or run openspec new change. After initialization, rerun this context check before continuing. For any other context failure, stop and report the error; do not fall back to the current directory or run later OpenSpec commands without the selected store.

    Only when context returns a resolved root.path, read <root.path>/openspec/config.yaml. Use config.yml only when config.yaml does not exist. If neither file exists, continue without project context. Do not fall back to config.yml if config.yaml is unreadable or invalid.

    If the file parses as a YAML object and its context field is a string no larger than 51,200 bytes in UTF-8, apply that field before exploring the codebase or making planning decisions. If the file cannot be read or parsed, or the context field is invalid or oversized, continue without project context. Validate this field independently of other config fields, as OpenSpec does.

Read the full file on GitHub · 164 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. 1mo ago Changed · +49 lines 5060f490a1ed
  2. 1mo ago First seen · 115 lines · 47 tokens per session scan A a666b2381a7d

Subscribe to this mod's changes

openspec-propose is a skill published in the GitHub repository BuildrAI/Buildr (28 stars, last pushed yesterday), licensed MIT. It adds 47 tokens to every session and 2,994 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 84% identical to openspec-propose, differing in 100 lines, and is treated as a copy.

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