opencode-build-tool SKILL.md skillA
opencode-build-tool from pantheon-org/tekhne is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add pantheon-org/tekhne/opencode-build-tool@git:20260314.95ea1b2Pins git:20260314.95ea1b2 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- pantheon-org/tekhne
- Path
skills/agentic-harness/opencode-toolkit/build-tool/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260314.95ea1b2, committed Mar 14, 2026
- Size
- 3,876 bytes
- Repository stars
- 10
- License
- MIT
Build custom tools and plugins using the OpenCode SDK packages. Use when creating custom tools, implementing tool schemas, building plugins, managing OpenCode sessions, using opencode-ai/sdk or opencode-ai/plugin, creating a tool.ts file, writing an execute handler, using tool.schema, ToolContext, createOpencode, plugin hooks, custom auth, automating OpenCode from a script, building a CI tool, or integrating external APIs. Keywords: Zod schema, execute handler, event streaming, session…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# OpenCode SDK Development
## Quick Start: Custom Tool in 3 Steps
1. Create `.opencode/tool/my-tool.ts`:
```typescript
import { tool } from "@opencode-ai/plugin"
export default tool({
description: "Brief description of what the tool does",
args: {
query: tool.schema.string().describe("Search query")
},
async execute({ query }, { abort }) {
return `Result for: ${query}`
}
})
```
1. Restart OpenCode — tools are auto-discovered.
1. Filename = tool name: `my-tool.ts` → `my-tool`.
## Mindset
- `@opencode-ai/plugin` — **Tools + Hooks**: Add LLM-callable tools, intercept execution, react to events
- `@opencode-ai/sdk` — **Client API**: Control OpenCode from external scripts, session management
**When to use**: Adding new capabilities the agent doesn't have, automating OpenCode from CI/scripts, or integrating external APIs as first-class tools.
**When NOT to use**: Built-in tool exists (`client.tool.list()`). Need shell (use `$` from Bun). Logic belongs in system prompt (`AGENTS.md`). Need MCP.
> Full decision guide in [advanced-patterns.md](references/advanced-patterns.md).
## Tool File Locations
```bash
.opencode/tool/*.ts # project-specific
…Read the whole file at its exact version.
How to install
mdr add pantheon-org/tekhne/opencode-build-tool@sha256:837842f8fa125d96The line at the top of this page pins the label git:20260314.95ea1b2, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_36du4gjzual76chx)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Mar 14, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (3876 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
pantheon-org/tekhne · 10 stars · license MIT · pushed 2026-10-21 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_36du4gjzual76chx GET https://markdownregistry.com/api/v1/resolve?ref=pantheon-org/tekhne/opencode-build-tool GET https://markdownregistry.com/api/v1/blob/837842f8fa125d96c6371cde21adf86342d0fb2f5e2f9406597790030737529f
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.