What is skill-authoring?

A workflow for creating and registering reusable OpenCode skills, which are documented instructions for coding-agent tasks. It covers the required folder, file format, naming, and discovery checks.

Use it to create a skill under the supported project or global locations, write its documentation, validate its name and frontmatter, and check that OpenCode lists it.

It reduces guesswork when adding a new skill or updating its metadata. It also helps ensure the skill can be found and used by OpenCode.

How different-ai/agent-bank configures OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to different-ai/agent-bank. 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/different-ai/agent-bank/main/.opencode/skill/skill-authoring/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/different-ai/agent-bank

Made for: OpenCode.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/different-ai/agent-bank/skill-authoring.svg)](https://agentmods.dev/skills/different-ai/agent-bank/skill-authoring)

Your own site

<a href="https://agentmods.dev/skills/different-ai/agent-bank/skill-authoring"><img src="https://agentmods.dev/badge/skills/different-ai/agent-bank/skill-authoring.svg" alt="Measured on agentmods" height="20"></a>

Per session 14 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 491 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.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00014	$0.00491
Opus 5	$0.00007	$0.00246
Sonnet 5	$0.00003	$0.00098
Haiku 4.5	$0.00001	$0.00049

Measured 8d ago against content hash e5f940039992, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

skill-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 8d 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.

.opencode/skill/skill-authoring/SKILL.md · 65 lines

What it actually says

What I do

Define the steps and checks for adding a new OpenCode skill
Ensure the skill is discoverable by the skill tool
Validate naming, frontmatter, and placement rules

When to use

Adding a new reusable workflow or playbook as a skill
Updating skill metadata to meet OpenCode discovery requirements

Workflow

Pick a skill name that matches ^[a-z0-9]+(-[a-z0-9]+)*$ and is 1–64 chars.
Create .opencode/skill/<name>/SKILL.md and ensure the folder matches the name.
Add YAML frontmatter with name and description (optional: license, compatibility, metadata).
Write the body with clear sections (Purpose/What I do, When to use, Workflow, Completion criteria).
Confirm discovery: run OpenCode in the repo and check skill tool list.
If permissions block it, update opencode.json with permission.skill rules.

Placement rules (from opencode.ai docs)

Project: .opencode/skill/<name>/SKILL.md
Project (Claude compatible): .claude/skills/<name>/SKILL.md
Global: ~/.config/opencode/skill/<name>/SKILL.md
Global (Claude compatible): ~/.claude/skills/<name>/SKILL.md

Validation checklist

SKILL.md is all caps and contains YAML frontmatter
name matches folder name
description is 1–1024 characters
No duplicate skill names in the repo

Example

---
name: git-release
description: Create consistent releases and changelogs
compatibility: opencode
---

## What I do

- Draft release notes from merged PRs
- Propose a version bump
- Provide a `gh release create` command

Completion criteria

Skill appears in skill tool list
skill({ name }) loads without errors
Instructions are clear enough to execute without extra context

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.

8d ago First seen · 65 lines · 14 tokens per session scan A e5f940039992

Subscribe to this mod's changes

skill-authoring is a skill published in the GitHub repository different-ai/agent-bank (249 stars, last pushed 5mo ago), licensed MIT. It adds 14 tokens to every session and 491 once invoked, about $0.0001 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.

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