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 skills add majiayu000/claude-skill-registry --skill agent-command-authoringgit clone --depth 1 https://github.com/majiayu000/claude-skill-registryWrote 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/majiayu000/claude-skill-registry/agent-command-authoring)<a href="https://agentmods.dev/skills/majiayu000/claude-skill-registry/agent-command-authoring"><img src="https://agentmods.dev/badge/skills/majiayu000/claude-skill-registry/agent-command-authoring/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/majiayu000/claude-skill-registry/agent-command-authoring"><img src="https://agentmods.dev/badge/skills/majiayu000/claude-skill-registry/agent-command-authoring.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
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 →
- medium Rogue Agent · line 90 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 | $0.00037 | $0.01465 |
| Opus 5 | $0.00018 | $0.00732 |
| Sonnet 5 | $0.00007 | $0.00293 |
| Haiku 4.5 | $0.00004 | $0.00146 |
Grade A, and why
agent-command-authoring 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 9d 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 — 234 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Agent Command Authoring
Create commands that delegate to subagents for Claude Code and OpenCode.
When to Use This Skill
Use this skill when:
- Creating a new custom command
- Refactoring an existing command to delegate to a subagent
- Ensuring consistency between Claude Code and OpenCode command implementations
The Delegation Pattern
Commands should be thin wrappers that delegate to subagents (which in turn delegate to skills):
command → subagent → skill
Claude Code command (.claude/commands/<name>.md):
---
description: Brief description of what the command does
allowed-tools: Task(subagent-name)
---
Use the `<subagent-name>` subagent to accomplish this task.
OpenCode command (.config/opencode/command/<name>.md):
---
description: Brief description of what the command does
agent: <subagent-name>
---
Use the `<subagent-name>` subagent to accomplish this task.
Claude Code Command Structure
Frontmatter Fields
| Field | Required | Description |
|---|---|---|
description |
Yes | 1-2 sentence description of what the command does |
allowed-tools |
Yes | Task(subagent-name) to invoke the subagent |
argument-hint |
No | Hint for command arguments (e.g., [feature_name [subtask_number]]) |
allowed-tools Format
For commands that delegate to subagents:
Task(subagent-name)- Invoke a subagent
Example:
allowed-tools: Task(git-committer)
Naming Conventions
Command names should use the imperative form of verbs (telling the agent what to do):
- ✅
commit,stage,lint,test,review,reflect - ❌
committing,git-committer,do-linting
The imperative form gives commands their characteristic feel:
- "commit" = "perform a commit"
- "stage" = "stage changes"
- "test" = "run tests"
OpenCode Command Structure
Frontmatter Fields
| Field | Required | Description |
|---|---|---|
description |
Yes | 1-2 sentence description of what the command does |
agent |
Yes | Name of the subagent to invoke |
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.
- 9d ago First seen · 234 lines · 37 tokens per session scan A ddb43a814871
agent-command-authoring is a skill published in the GitHub repository majiayu000/claude-skill-registry (606 stars, last pushed today), licensed MIT. It adds 37 tokens to every session and 1,465 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 2026-09-03.
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