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cross-agent

cross-agent is a skill for Claude Code from drn/dots. It costs 40 tokens per session (3,919 once invoked), scanned B, original, MIT.

A setup tool for making reusable coding-agent instructions work across Claude Code, OpenAI Codex, and GitHub Copilot.

In plain words
What is it for?
Use it to migrate repository skills, inspect existing agent configuration, and set up shared instructions such as AGENTS.md or related files.
Why use it?
It reduces duplicated instruction files and helps different coding agents use the same project guidance.

Skill for Claude Code

Written for Claude Code: disable-model-invocation in frontmatter. Also seen: reads .claude/ paths; mentions CLAUDE.md; mentions Claude Code.

not rated 23repo 11d ago B scan 40 tokens original MIT

Good fit Use it to migrate repository skills, inspect existing agent configuration, and set up shared instructions such as AGENTS.md or related files.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/drn/dots/cross-agent
View source ↗ drn/dots
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 drn/dots --skill cross-agent
Clone the repo
git clone --depth 1 https://github.com/drn/dots

Made for: Claude Code.

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 cross-agent

README.md
[![agentmods](https://agentmods.dev/badge/skills/drn/dots/cross-agent/github.svg)](https://agentmods.dev/skills/drn/dots/cross-agent)
Your own site
<a href="https://agentmods.dev/skills/drn/dots/cross-agent"><img src="https://agentmods.dev/badge/skills/drn/dots/cross-agent/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 cross-agent

Your own site · 80×15
<a href="https://agentmods.dev/skills/drn/dots/cross-agent"><img src="https://agentmods.dev/badge/skills/drn/dots/cross-agent.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 40 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,919 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. A grade says what 26 rules found in the file — not that it is safe.
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 $0.00040 $0.03919
Opus 5.5 $0.00016 $0.01568
Sonnet 5.5 $0.00008 $0.00784
Haiku 4.5 $0.00004 $0.00392

Measured 1mo ago against content hash a3702bcb0fed, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

cross-agent scanned grade B 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.

Enumerates other installed skillsmediumAgent snooping

Other skills' SKILL.md files reveal prompts, capabilities and secrets that should be invisible to peers.

- Existing .claude/skills: !`find .claude/skills -maxdepth 2 -name SKILL.md 2>/dev/null | head -30`
agents/skills/cross-agent/SKILL.md · 305 lines

How it starts

The opening of the file, as written. The whole thing — 305 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Cross-Agent Skill Setup

Migrate a repository's skills to the Agent Skills open standard so they work across Claude Code, Codex, and Copilot.

Arguments

  • $ARGUMENTS - Optional: path to target repo (defaults to current working directory)

Context

  • Existing .agents/skills: !find .agents/skills -maxdepth 2 -name SKILL.md 2>/dev/null | head -30
  • Existing .claude/commands: !find .claude/commands -maxdepth 1 -name "*.md" 2>/dev/null | head -30
  • Existing .claude/skills: !find .claude/skills -maxdepth 2 -name SKILL.md 2>/dev/null | head -30
  • AGENTS.md exists: !find . -maxdepth 1 -name AGENTS.md 2>/dev/null | head -1
  • CLAUDE.md type: !file CLAUDE.md 2>/dev/null | head -1
  • claude.md (lowercase) exists: !find . -maxdepth 1 -type f 2>/dev/null | grep '/claude\.md$' | head -1
  • Copilot instructions: !find .github -maxdepth 1 -name copilot-instructions.md 2>/dev/null | head -1
  • Subtree CLAUDE.md files: !find . -mindepth 2 -maxdepth 4 -name CLAUDE.md -not -path './.git/*' 2>/dev/null | head -20
  • Subtree AGENTS.md files: !find . -mindepth 2 -maxdepth 4 -name AGENTS.md -not -path './.git/*' 2>/dev/null | head -20
  • Git root: !git rev-parse --show-toplevel 2>/dev/null | head -1

Instructions

Step 0: Pre-flight

Verify this is a git repository. If not, stop and report.

If $ARGUMENTS contains a path, cd to it first.

Step 1: Discover Repo State

Scan for existing skills in all locations:

  1. .agents/skills/*/SKILL.md (already canonical)
  2. .claude/commands/*.md (Claude flat commands)
  3. .claude/skills/*/SKILL.md (Claude directory skills) Also check for a lowercase claude.md — Claude Code requires CLAUDE.md (uppercase) for discovery. Use ls -1 | grep '^claude\.md$' to detect the wrong casing (a plain test -f is unreliable on case-insensitive filesystems).

Classify the repo:

  • GREENFIELD: No skills anywhere. Create infrastructure only.
  • CLAUDE-ONLY: Skills in .claude/ but no .agents/skills/. Full migration needed.
  • PARTIAL: .agents/skills/ exists but missing infrastructure (no AGENTS.md, no Copilot instructions, no sync scripts).
  • COMPLETE: .agents/skills/ exists with all infrastructure. Run validation only.

Read the full file on GitHub · 305 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 First seen · 305 lines · 40 tokens per session scan B a3702bcb0fed

Subscribe to this mod's changes

cross-agent is a skill published in the GitHub repository drn/dots (23 stars, last pushed 11d ago), licensed MIT. It adds 40 tokens to every session and 3,919 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it B with 1 finding (enumerates other installed skills). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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