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.
npx agentmods add skills/googlecloudplatform/cortex-framework/create_skillnpx skills add GoogleCloudPlatform/cortex-framework --skill create_skillgit clone --depth 1 https://github.com/GoogleCloudPlatform/cortex-frameworkWhat 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 | $0.00033 | $0.01108 |
| Opus 5 | $0.00016 | $0.00554 |
| Sonnet 5 | $0.00007 | $0.00222 |
| Haiku 4.5 | $0.00003 | $0.00111 |
Grade A, and why
create-skill 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 yesterday.
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 — 98 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Creating a New Cortex Developer Skill
This skill guides the end-to-end creation, overlap evaluation, authoring, validation, and ecosystem registration of new AI agent skills in Cortex Framework V7, or the creation of custom instruction extensions inside existing skill custom/ directories.
CRITICAL OPERATIONAL RULE: You are an end-to-end deployment agent, not just a text generator. A skill creation task is NOT complete until the mandatory Skill Anatomy Validation Gate has been executed with a 100% pass rate. You MUST NOT stop after creating the files.
CRITICAL ISOLATION RULE (ZERO-TRUST FOR CORE PLATFORM): New skills must reside exclusively inside .agents/skills/<skill_name>/. Never modify platform core runtime code (cortex-framework-core/src/common/) while authoring skills unless explicitly instructed by the user.
Step 1: Overlap Analysis & Pathway Selection
Before creating a new skill, evaluate existing skills to prevent redundancy and fragmentation.
1. Perform Skill Overlap Assessment
Dynamically inspect the existing skills in .agents/skills/ (and the registry in .agents/AGENTS.md). Read their frontmatter descriptions to evaluate whether the requested capability overlaps with an existing workflow.
2. Select Pathway: Custom Extension vs. Standalone Skill
Refer to skill_anatomy_guide.md and authoring_best_practices.md for the decision matrix:
- Path A (Custom Extension via
custom/): If the proposed capability extends or customizes an existing lifecycle phase (e.g. organization-specific naming standards, custom test assertions, compliance gates, specialized dataset targets), DO NOT create a new skill. Instead, proceed to Step 2A to create custom instructions in<existing_skill>/custom/. - Path B (New Standalone Skill): If the capability introduces a genuinely new domain or distinct lifecycle phase not covered by any existing skill, proceed to Step 2B to scaffold and author a new standalone skill.
What ships with it
6 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.
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.
- yesterday First seen · 98 lines · 33 tokens per session scan A db7e771bbb50
create-skill is a skill published in the GitHub repository GoogleCloudPlatform/cortex-framework (10 stars, last pushed 6d ago), licensed Apache-2.0. It adds 33 tokens to every session and 1,108 once invoked, about $0.0002 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 2026-08-31.
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