Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/mhylle/claude-skills-collectionnpx agentmods add skills/mhylle/claude-skills-collection/create-planWrote 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.
[](https://agentmods.dev/skills/mhylle/claude-skills-collection/create-plan)<a href="https://agentmods.dev/skills/mhylle/claude-skills-collection/create-plan"><img src="https://agentmods.dev/badge/skills/mhylle/claude-skills-collection/create-plan/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.
<a href="https://agentmods.dev/skills/mhylle/claude-skills-collection/create-plan"><img src="https://agentmods.dev/badge/skills/mhylle/claude-skills-collection/create-plan.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 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 Memory Poisoning · line 310 Skill manipulates agent memory, state, or stored context. Memory corruption can alter personality, override safety rules, or cause unpredictable behavior.Fix: Protect agent memory and state from modification by untrusted content. Use read-only memory for critical instructions and validate all state changes.
- medium Rogue Agent · line 246 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00076 | $0.03050 |
| Opus 5 | $0.00038 | $0.01525 |
| Sonnet 5 | $0.00015 | $0.00610 |
| Haiku 4.5 | $0.00008 | $0.00305 |
Grade A, and why
create-plan 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 11d 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.
How it starts
The opening of the file, as written. The whole thing — 414 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Create Plan
Create detailed, well-researched implementation plans through interactive collaboration and thorough codebase investigation.
When to Use This Skill
- Planning new features or functionality
- Designing technical implementations before coding
- Creating phased development roadmaps
- Structuring complex refactoring work
- Any task requiring upfront planning and design
Initial Input Handling
Parse the user's request to identify:
- Task description - What needs to be implemented
- Context files - Relevant existing code or documentation
- Constraints - Timeline, technology, or scope limitations
| Scenario | Action |
|---|---|
| Parameters provided | Read all referenced files completely, then proceed to Research |
| Missing task description | Ask: "What feature or functionality should I plan?" |
| No context provided | Ask: "Are there existing files or documentation I should review?" |
Planning Workflow
Phase 1: Research
Critical: Thoroughly investigate the codebase before planning.
Spawn parallel sub-tasks using specialized agents:
Research Tasks:
- codebase-locator: Find all files related to the feature area
- codebase-analyzer: Understand existing patterns and architecture
- Explore: Investigate integration points and dependencies
For each research task, provide:
- Specific directories to examine
- Exact patterns or code to find
- Required output: file:line references
Read all identified files completely - no partial reads or summaries.
Phase 2: Present Understanding
Before any design work, present findings:
-
Codebase Analysis
- Relevant existing code with file:line references
- Current patterns and conventions discovered
- Integration points and dependencies
-
Clarifying Questions
- Ask only questions that code investigation couldn't answer
- Focus on business logic, user requirements, edge cases
- Avoid questions answerable by reading more code
Wait for user response before proceeding.
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.
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.
- 11d ago First seen · 414 lines · 76 tokens per session scan A 818abbf52d6b
create-plan is a skill published in the GitHub repository mhylle/claude-skills-collection (18 stars, last pushed 8d ago), licensed MIT. It adds 76 tokens to every session and 3,050 once invoked, about $0.0004 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 2026-08-30.
Other skills, from other repositories
systematic-debugging
Use when encountering any bug, test failure, or unexpected behavior, before proposing fixes.
local-ai-agents
Build local-first AI agents that run entirely on a developer workstation with Microsoft Foundry Local and Qwen function-calling models. Covers Small Language Models (SLMs), the OpenAI-compatible local endpoint, sandboxed local tools, local RAG with Chroma, local MCP servers, hybrid cloud/local routing, and the…
next-cache-components-adoption
Turn on Cache Components in a Next.js app and resolve the blocking routes it surfaces. Use when the user wants to enable, adopt, or migrate to Cache Components, flip the cacheComponents flag, work through a flood of blocking-prerender / instant validation errors, run the cache-components-instant-false codemod, or…
insight-error-page
Write or audit an insight-kind error page for the Next.js dev overlay. Use when creating a new errors/ .mdx page, auditing an existing one, or checking that a page matches the framework fix cards. Covers page structure, title alignment, FixCard cards with Copy prompt button, code snippets, terminology verification…
next-cache-components-optimizer
Drive a Next.js route to instant navigation by setting up an agentic loop, under Cache Components / PPR, on initial load (hard navigation) and client-side navigation (soft navigation). Encode the goal as a failing @next/playwright instant() e2e and work it to green, one verified route at a time; the shipped test then…
next-partial-prefetching-adoption
Turn on Partial Prefetching in a Next.js app and work through the insights it surfaces. Use when the user wants to enable or adopt Partial Prefetching, flip the partialPrefetching flag, opt routes in with export const prefetch = 'partial', audit Link prefetch={true} behavior, preserve existing prefetched UI with…