openspec-plus-apply

openspec-plus-apply is a skill for Claude Code, Codex from sudokar/openspec-plus. It costs 110 tokens per session (7,431 once invoked), scanned A, original, MIT.

A guided implementation workflow for OpenSpec changes, where OpenSpec is a system for describing planned code changes before building them. It coordinates coding agents, tests, reviews, and quality checks during implementation.

In plain words
What is it for?
Use it to implement an approved OpenSpec change, split work into dependency-aware slices, run strict test-first development, and perform specification, code-quality, formatting, and test checks.
Why use it?
It reduces the risk of implementing the wrong requirements or overlooking failing tests. It also organizes work that may have dependencies and prevents known failures from being ignored.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: mentions CLAUDE.md; mentions subagents; names the TodoWrite tool.

Good fit Use it to implement an approved OpenSpec change, split work into dependency-aware slices, run strict test-first development, and perform specification, code-quality, formatting, and test checks.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/sudokar/openspec-plus/openspec-plus-apply
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 sudokar/openspec-plus --skill openspec-plus-apply
Clone the repo
git clone --depth 1 https://github.com/sudokar/openspec-plus

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 openspec-plus-apply

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

Your own site · 80×15
<a href="https://agentmods.dev/skills/sudokar/openspec-plus/openspec-plus-apply"><img src="https://agentmods.dev/badge/skills/sudokar/openspec-plus/openspec-plus-apply.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 110 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 7,431 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 warn 7 Sept 2026
SkillSpector: 1 finding, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • medium Excessive Agency · line 248
    Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.
    Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
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 $0.00110 $0.07431
Opus 5.5 $0.00044 $0.02972
Sonnet 5.5 $0.00022 $0.01486
Haiku 4.5 $0.00011 $0.00743

Measured 1mo ago against content hash 73641cba6872, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

openspec-plus-apply 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.

skills/openspec-plus-apply/SKILL.md · 568 lines

How it starts

The opening of the file, as written. The whole thing — 568 lines — stays where its author put it; the contents beside it link to each section on GitHub.

OpenSpec Plus Apply

Mission

Wrap vanilla /opsx-apply step 6 (task implementation loop) with subagent orchestration, two-stage review, strict TDD via openspec-plus-tdd, four implementation principles, conditional parallelism over a dependency-validated graph, per-slice + final lint/format/test/other gates, never-ignore-failures rule.

Vanilla owns:

  • Step 1 — Select change
  • Step 2 — openspec status --change <name> --json
  • Step 3 — openspec instructions apply --change <name> --json
  • Step 4 — Read context files
  • Step 5 — Show progress
  • Step 7 — Final status (this skill EMULATES output, not invokes vanilla)

This skill takes over Step 6 only.


RIGID. NEVER skip Phase 0 mode question when settings.apply.executionMode is ask. NEVER read affected source code files into the main agent's context — pass PATHS to subagents who read them. NEVER mark a slice [x] while a relevant test is failing or skipped. NEVER run code-quality review before spec-compliance ✅. NEVER dispatch parallel implementer subagents within a change without dependency analysis + user confirmation. NEVER modify spec/design from inside the implementer — escalate to plus-design / plus-spec. NEVER commit code. NEVER take over vanilla steps 1-5 or invoke openspec-verify-change or auto-trigger /opsx-archive.

Red flags — STOP, you are about to violate this skill:

  • "Re-read the artifacts to be safe" — vanilla loaded them, in context
  • "Let me read the affected source files before dispatching the subagent" — NO (subagent mode). Pass paths. Subagent reads. (Inline mode is different — main agent reads directly.)
  • "Critique the spec/design before starting" — done; trust them
  • "Fix the spec/design from here while implementing" — escalate, don't edit
  • "Mark the test .skip to move on" — never. Failing tests block progress
  • "Slice is small, skip the spec-compliance reviewer" — never
  • "Implementer's report says DONE, good enough" — verify with reviewer subagents
  • "Both reviewers found issues, fix simultaneously" — spec-compliance first, re-review, then code-quality
  • "Reviewing is generic, I'll write the review prompt myself" — NO. Every reviewer dispatch reads its *-prompt.md and sends the body verbatim; improvising it is the #1 failure mode
  • "This prompt is long, I'll tighten it / drop the obvious parts when passing it on" — NO. Copy the template's prompt: block verbatim, substitute only {PLACEHOLDER}s. Every bullet is load-bearing; simplifying silently strips instructions from the subagent
  • "Should I continue to the next slice?" — never ask. Continuous unless BLOCKED
  • "Three fixes failed, try a fourth" — STOP. Artifacts wrong. Pause and exit
  • "Run all tests instead of just affected" — wastes time; per-slice gate is scoped
  • "Commit as I go" — vanilla doesn't commit; we don't either
  • "Run /opsx-archive once everything is done" — only suggest, never auto-trigger
  • "Run openspec-verify-change as part of final gate" — out of scope
  • "Implementer wrote all tests upfront, that's fine" — TDD violation. One test at a time.
  • "Implementer skipped REFACTOR because nothing to refactor" — refactor assessment is mandatory; skipping the assessment is the violation, not the skipping of action
  • "AGENTS.md has many rules, implementer applied the ones that felt relevant" — cherry-picking the project's documented rules. Follow them strictly, end-to-end.
  • "Implementer did test 1 RED-GREEN-REFACTOR correctly, then batched the rest" — the per-test state machine applies to EVERY test, not just the first
  • "Implementer only wrote acceptance tests (one per Gherkin scenario), skipped all unit/edge tests" — acceptance coverage is mandatory but granular tests are encouraged for non-trivial branches, edges, error paths

Read the full file on GitHub · 568 lines

Files

What ships with it

4 files 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. 1mo ago Changed · +9 lines 73641cba6872
  2. 1mo ago First seen · 559 lines · 110 tokens per session scan A c32c960b4f4f

Subscribe to this mod's changes

openspec-plus-apply is a skill published in the GitHub repository sudokar/openspec-plus (215 stars, last pushed 1mo ago), licensed MIT. It adds 110 tokens to every session and 7,431 once invoked, about $0.0004 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 2026-08-30.

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