create-spec

create-spec is a skill for Claude Code, Codex from bastani-inc/atomic. It costs 47 tokens per session (8,121 once invoked), scanned A, original, no licence file.

A detailed implementation plan or product requirements document for a feature or code refactor, based on how the existing codebase is organized.

In plain words
What is it for?
Use it before implementing features or refactors when you need an execution plan grounded in existing code and research.
Why use it?
It turns a requested change into a concrete plan connected to the parts of the program that carry its main purpose.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing.

Good fit Use it before implementing features or refactors when you need an execution plan grounded in existing code and research.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/bastani-inc/atomic/create-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 bastani-inc/atomic --skill create-spec
Clone the repo
git clone --depth 1 https://github.com/bastani-inc/atomic

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 create-spec

README.md
[![agentmods](https://agentmods.dev/badge/skills/bastani-inc/atomic/create-spec/github.svg)](https://agentmods.dev/skills/bastani-inc/atomic/create-spec)
Your own site
<a href="https://agentmods.dev/skills/bastani-inc/atomic/create-spec"><img src="https://agentmods.dev/badge/skills/bastani-inc/atomic/create-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 create-spec

Your own site · 80×15
<a href="https://agentmods.dev/skills/bastani-inc/atomic/create-spec"><img src="https://agentmods.dev/badge/skills/bastani-inc/atomic/create-spec.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 8,121 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. 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: 4 findings, up to high

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 →

  • high Tool Misuse · line 269
    Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).
    Fix: Validate all tool parameters against an allowlist. Reject dangerous parameter values (shell=True, --force, -rf /) and use safe defaults.
  • high Tool Misuse · line 279
    Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).
    Fix: Validate all tool parameters against an allowlist. Reject dangerous parameter values (shell=True, --force, -rf /) and use safe defaults.
  • medium Prompt Injection · line 135
    Large whitespace padding was detected (a block of blank lines or a long run of spaces). This can push injected instructions below or to the right of the visible area so a human reviewer never sees them while the agent still reads them. Manual review of the hidden content is recommended.
    Fix: Remove the large whitespace padding (blank-line blocks or long space runs) and review any content hidden below or to the right of it. Keep skill files compact and reviewable so no instructions can be
  • medium Prompt Injection · line 136
    Large whitespace padding was detected (a block of blank lines or a long run of spaces). This can push injected instructions below or to the right of the visible area so a human reviewer never sees them while the agent still reads them. Manual review of the hidden content is recommended.
    Fix: Remove the large whitespace padding (blank-line blocks or long space runs) and review any content hidden below or to the right of it. Keep skill files compact and reviewable so no instructions can be
How audits are shown
Origin unknown 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 $0.00047 $0.08121
Opus 5.5 $0.00019 $0.03248
Sonnet 5.5 $0.00009 $0.01624
Haiku 4.5 $0.00005 $0.00812

Measured 1mo ago against content hash 46b19d134d33, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

create-spec scanned grade A with 1 finding 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.

Runs shell commandslowCapability

Expected in a hook, worth knowing in a rule or an instructions file.

5. **Keep the dangerous doors few and honest.** The maturity of a system is visible in how few doors guard its irreversible effects — and how truthfully those doors are named. Every place money moves, access is granted,
packages/workflows/skills/create-spec/SKILL.md · 367 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

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 First seen · 367 lines · 47 tokens per session scan A 46b19d134d33

Subscribe to this mod's changes

create-spec is a skill published in the GitHub repository bastani-inc/atomic (861 stars, last pushed today), with no licence file. It adds 47 tokens to every session and 8,121 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 1 finding (runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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