grida: Skill for Claude Code

.agents/skills/security/SKILL.md

security is a skill for Claude Code, Codex from gridaco/grida. It costs 118 tokens per session (1,296 once invoked), scanned A, original, Apache-2.0.

Security-boundary instructions for the Grida codebase. They explain how tagged GRIDA-SEC records document attacks that the code is designed to prevent.

In plain words
What is it for?
Use them when editing code marked with a GRIDA-SEC tag, checking related files, or adding a new prevented-vulnerability record.
Why use it?
They help developers understand which files jointly enforce a security rule before changing one of them.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: installed under .agents/ (shared by several agents); mentions AGENTS.md.

This is gridaco/grida's own configuration. It tells Claude Code and Codex how to work on grida itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything grida configures →

About the project

Grida is an open-source graphics workspace that combines an infinite canvas editor, SVG tools, a database and CMS, and forms. Designers and developers use it to create, import, render, and manage visual documents and connected data, while the catalogue add-ons support its workflows.

gridaco/grida · 2,693 stars · on GitHub · grida.co

Reuse

Borrowing it

Nothing to install: this file belongs to gridaco/grida. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/gridaco/grida/main/.agents/skills/security/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/gridaco/grida

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 security

README.md
[![agentmods](https://agentmods.dev/badge/skills/gridaco/grida/security/github.svg)](https://agentmods.dev/skills/gridaco/grida/security)
Your own site
<a href="https://agentmods.dev/skills/gridaco/grida/security"><img src="https://agentmods.dev/badge/skills/gridaco/grida/security/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 security

Your own site · 80×15
<a href="https://agentmods.dev/skills/gridaco/grida/security"><img src="https://agentmods.dev/badge/skills/gridaco/grida/security.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 118 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,296 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 pass 7 Sept 2026
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 $0.00118 $0.01296
Opus 5.5 $0.00047 $0.00518
Sonnet 5.5 $0.00024 $0.00259
Haiku 4.5 $0.00012 $0.00130

Measured 1mo ago against content hash b51d83e12cf9, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

security 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.

.agents/skills/security/SKILL.md · 111 lines

How it starts

The opening of the file, as written. The whole thing — 111 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Security boundaries — GRIDA-SEC

What GRIDA-SEC-<id> means

Each GRIDA-SEC-<id> is a prevented vulnerability — a class of attack that would exist by default but the codebase structurally forecloses. Unlike a CVE (which describes something that was broken), a GRIDA-SEC id is a contract: this specific class of attack is impossible because of these specific files, and we keep it that way.

/SECURITY.md is the canonical registry. Every id has a section there with:

  • What it protects — the boundary in plain English.
  • Vulnerable scenario — the attack that would exist without the boundary.
  • How the code prevents it — the enforcement mechanism, file by file.
  • Files bound by this id — the exact files whose contents make up the contract.

Working with tagged code

When you see GRIDA-SEC-<id> in a file you're touching:

  1. Read the entry in /SECURITY.md for that id. Don't act on the tag alone — the rules are spelled out there.
  2. Run grep -rn GRIDA-SEC-<id> . to find every other file in the contract. Changes that look local often aren't — a tagged file is load-bearing for the boundary.
  3. Don't remove a tag without removing the entry from /SECURITY.md in the same change, with a written justification.

Mandatory security review before commit

If your change touches any file containing a GRIDA-SEC-<id> tag, you must complete a security review before committing. The review is brief but explicit:

  1. Re-read the entry in /SECURITY.md for every GRIDA-SEC-<id> that appears in your diff. Confirm the prevented scenario is still prevented after your change.
  2. Walk the enforcement mechanism. For each numbered "How the code prevents it" step in the entry, point at the line in your diff (or confirm it's untouched) that satisfies that step.
  3. Verify all tagged files are still tagged. A rename, refactor, or move that drops the tag is a contract violation, even if behavior looks identical.
  4. If you added or removed a file from the boundary, update the "Files bound by this id" list in /SECURITY.md in the same commit.
  5. Run any tests adjacent to the boundary. The SECURITY.md entry for the id may list specific tests; use grep -rn GRIDA-SEC-<id> --include='*test*' --include='*spec*' to find any others.

Read the full file on GitHub · 111 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 · +5 lines b51d83e12cf9
  2. 2mo ago First seen · 106 lines · 118 tokens per session scan A 6831a6c6c860

Subscribe to this mod's changes

security is a skill published in the GitHub repository gridaco/grida (2,693 stars, last pushed 11d ago), licensed Apache-2.0. It adds 118 tokens to every session and 1,296 once invoked, about $0.0005 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.