What is add-opencode-model?

A model-registration helper for OpenCode Zen, a service that provides access to language models. It checks model information through OpenCode and OpenRouter before producing data for the model registry.

Use it when adding or configuring an OpenCode Zen model in the project's provider file. It reports the model's identifiers, limits, pricing, client type, and supported capabilities.

It prevents model settings such as context size, output limits, pricing, and supported features from being guessed or entered inaccurately.

How travisennis/acai configures Claude Code and Codex

Reuse

Borrowing it

Nothing to install: this file belongs to travisennis/acai. 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/travisennis/acai/master/.agents/skills/add-opencode-model/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/travisennis/acai

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/travisennis/acai/add-opencode-model/github.svg)](https://agentmods.dev/skills/travisennis/acai/add-opencode-model)

Your own site

<a href="https://agentmods.dev/skills/travisennis/acai/add-opencode-model"><img src="https://agentmods.dev/badge/skills/travisennis/acai/add-opencode-model/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/travisennis/acai/add-opencode-model"><img src="https://agentmods.dev/badge/skills/travisennis/acai/add-opencode-model.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 69 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,118 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	$0.00069	$0.02118
Opus 5.5	$0.00028	$0.00847
Sonnet 5.5	$0.00014	$0.00424
Haiku 4.5	$0.00007	$0.00212

Measured 2mo ago against content hash b45847d3cd09, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

add-opencode-model 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 2mo ago.

The scan reads SKILL.md. This mod also ships 1 executable file (add-model.js), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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/add-opencode-model/SKILL.md · 229 lines

How it starts

The opening of the file, as written. The whole thing — 229 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Add OpenCode Zen Model

Fetches model details from both OpenCode and OpenRouter APIs to provide structured information for the agent to add the model to source/models/opencode-zen-provider.ts.

Usage

Run this script from this file's directory.

./add-model.js google/gemini-3-flash-preview

How It Works

Confirms model exists in OpenCode API (https://opencode.ai/zen/v1/models)
Searches OpenRouter API (https://openrouter.ai/api/v1/models) for matching model to get:
- Context window length
- Max output tokens
- Pricing information
- Supported features (reasoning/tool calling)
Determines client type based on model provider:
- openai → uses @ai-sdk/openai (Responses API)
- google → uses @ai-sdk/google (custom base URL)
- anthropic → uses @ai-sdk/anthropic
- openai-compatible → uses createOpenAICompatible
Outputs JSON with all details needed to add the model

JSON Output Format

The script outputs a JSON object wrapped in markers:

--- MODEL_DETAILS_JSON_START ---
{...}
--- MODEL_DETAILS_JSON_END ---

JSON Structure

{
  "modelKey": "gemini-3-flash-preview",
  "opencodeId": "google/gemini-3-flash-preview",
  "openrouterId": "google/gemini-3-flash-preview",
  "providerFile": "./source/models/opencode-zen-provider.ts",
  "registryId": "opencode:gemini-3-flash-preview",
  "clientType": "google",
  "registryEntry": {
    "id": "opencode:gemini-3-flash-preview",
    "provider": "OpenCode",
    "contextWindow": 1048576,
    "maxOutputTokens": 65535,
    "defaultTemperature": 0.5,
    "promptFormat": "markdown",
    "supportsReasoning": true,
    "supportsToolCalling": true,
    "costPerInputToken": 0.0000005,
    "costPerOutputToken": 0.000003
  },
  "clientConfig": {
    "key": "gemini-3-flash-preview",
    "opencodeId": "google/gemini-3-flash-preview",
    "clientType": "google",
    "openrouterId": "google/gemini-3-flash-preview"
  },
  "modelInfo": {
    "opencodeId": "google/gemini-3-flash-preview",
    "opencodeName": "Gemini 3 Flash Preview",
    "openrouterId": "google/gemini-3-flash-preview",
    "openrouterName": "Google: Gemini 3 Flash Preview",
    "contextLength": 1048576,
    "maxCompletionTokens": 65535,
    "pricing": {...},
    "supportedParameters": [...]
  }
}

Read the full file on GitHub · 229 lines

Files

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.

add-model.js 8.4 KB runs code

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.

2mo ago First seen · 229 lines · 69 tokens per session scan A b45847d3cd09

Subscribe to this mod's changes

add-opencode-model is a skill published in the GitHub repository travisennis/acai (5 stars, last pushed 3mo ago), licensed MIT. It adds 69 tokens to every session and 2,118 once invoked, about $0.0003 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 2026-08-31.

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acai: Skill for Claude Code