Oracle Models

Classifies development task complexity (LIGHT/MEDIUM/HEAVY) and suggests the most cost-efficient AI model — with client auto-detection that filters suggestions to match your environment.

10 providers: Claude (Anthropic), Gemini (Google), GPT (OpenAI), Grok (xAI), DeepSeek, Kimi (Moonshot), Qwen (Alibaba), Llama (Meta), Mistral, GLM (Z.ai).

Data sourced from the Artificial Analysis Intelligence Index.

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Agent Compatibility

Agent	MCP Server	Skill	Install command
OpenCode	Yes	Yes	npx skills add vanppsa/oracle-models -g -a opencode -y
Antigravity CLI	Yes	Yes	npx skills add vanppsa/oracle-models -g -a antigravity-cli -y
Gemini CLI	Yes	Yes	npx skills add vanppsa/oracle-models -g -a gemini-cli -y
Claude Code	Yes	Yes	npx skills add vanppsa/oracle-models -g -a claude-code -y
Codex	Yes	Yes	npx skills add vanppsa/oracle-models -g -a codex -y

Other Compatible Agents: Cursor, Cline, Windsurf, Roo Code, Goose, Kiro CLI, Amp, Augment, Trae, GitHub Copilot, VS Code Copilot.

To install for other agents, use the same command format: npx skills add vanppsa/oracle-models -g -a <agent-name> -y.

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Client Auto-Detection

Oracle Models automatically detects your MCP client during initialization and tailors model suggestions:

Native clients (Claude Code, Gemini CLI, Antigravity CLI, Codex) — returns only your provider's models. No noise.

Aggregator clients (OpenCode, Cursor, Cline, etc.) — returns the best 4 models across all providers, with at least 1 open-source model. DeepSeek is prioritized as best value.

Unknown clients — treated as aggregators.

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Quick Start

Install the Skill

# Install for all detected agents (recommended)
npx skills add vanppsa/oracle-models -g -y

# Install for a specific agent
npx skills add vanppsa/oracle-models -g -a opencode -y

Add the MCP Server

The skill provides behavioral instructions, but you also need the MCP server for live tools. Pick your agent below:

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MCP Server Setup by Agent

Standard MCP Configuration

The following agents share the same MCP configuration structure. Add this block to their respective configuration files as indicated:

{
  "mcpServers": {
    "oracle-models": {
      "command": "npx",
      "args": ["-y", "oracle-models-mcp"]
    }
  }
}

• Claude: claude mcp add oracle-models -- npx -y oracle-models-mcp
• Cursor: Add to .cursor/mcp.json (project) or ~/.cursor/mcp.json (global).
• Cline: Add to .cline/mcp.json or via Cline settings → MCP Servers.
• Windsurf: Add to .codeium/windsurf/mcp.json or via Windsurf settings → MCP.
• Codex: Add to ~/.codex/mcp.json or via Codex settings.
• Roo Code: Add to .roo/mcp.json or via Roo Code settings → MCP.
• Goose: Add to ~/.config/goose/mcp.json or via goose session --with-mcp oracle-models -- npx -y oracle-models-mcp.
• Kiro CLI: Add to .kiro/mcp.json.

Antigravity CLI

Antigravity CLI stores MCP servers in a dedicated mcp_config.json file. You can configure it globally or per workspace.

Workspace (recommended): Add to .agents/mcp_config.json:

{
  "mcpServers": {
    "oracle-models": {
      "command": "npx",
      "args": ["-y", "oracle-models-mcp"],
      "timeout": 10000
    }
  }
}

Global: Add to ~/.gemini/antigravity-cli/mcp_config.json:

{
  "mcpServers": {
    "oracle-models": {
      "command": "npx",
      "args": ["-y", "oracle-models-mcp"],
      "timeout": 10000
    }
  }
}

Or via CLI:

agy mcp add oracle-models -- npx -y oracle-models-mcp

Note: For remote MCP servers, Antigravity CLI uses serverUrl instead of url.

Gemini CLI

Deprecation notice: Gemini CLI will be fully migrated to Antigravity CLI on June 18th. The configuration below remains valid until then.

Add to ~/.gemini/settings.json:

{
  "mcpServers": {
    "oracle-models": {
      "command": "npx",
      "args": ["-y", "oracle-models-mcp"],
      "timeout": 10000
    }
  }
}

Or via CLI:

gemini mcp add oracle-models -- npx -y oracle-models-mcp

OpenCode

Add to ~/.config/opencode/opencode.json:

{
  "mcp": {
    "oracle-models": {
      "type": "local",
      "command": ["npx", "-y", "oracle-models-mcp"],
      "enabled": true,
      "timeout": 10000
    }
  }
}

VS Code Copilot

Add to .vscode/mcp.json or via VS Code settings → MCP:

{
  "servers": {
    "oracle-models": {
      "command": "npx",
      "args": ["-y", "oracle-models-mcp"]
    }
  }
}

---

MCP Tools Reference

classify_task

Classifies a development task by complexity using a weighted scoring engine with critical domain detection, penalty keywords, and entropy analysis.

Parameters:

Parameter	Type	Required	Description
description	string	Yes	Natural language description of the task
files_affected	number	No	Estimated number of affected files
description_length	number	No	Character count of the full task description if providing a summary. Used for entropy detection — long plans are automatically upgraded

Example:

{ "description": "Add email validation to registration form", "files_affected": 2 }

Response:

{
  "tier": "MEDIUM",
  "reason": "Inclusion of complex business rules/validations",
  "estimated_files": "2–5",
  "estimated_tokens": "200–800",
  "score": 15
}

get_model_suggestions

Returns recommended models for a tier. Auto-detects your client environment and filters accordingly.

Parameters:

Parameter	Type	Required	Description
tier	"LIGHT" | "MEDIUM" | "HEAVY"	Yes	Complexity tier
preferred_provider	string	No	Provider to highlight. One of: anthropic, google, zai, xai, openai, deepseek, moonshot, alibaba, meta, mistral

Response (aggregator client — e.g., OpenCode):

{
  "tier": "HEAVY",
  "updated_at": "2026-05-20",
  "data_source": "fallback",
  "client_detected": "opencode",
  "client_type": "aggregator",
  "client_label": "OpenCode",
  "models": {
    "openai": { "name": "GPT-5.5 (xhigh)", "score": 60, "price": 4.35, "speed": 659, "price_blended_usd_per_1m": 4.35 },
    "anthropic": { "name": "Claude Opus 4.7 (max)", "score": 57, "price": 4.10, "speed": 512, "price_blended_usd_per_1m": 4.10 },
    "moonshot": { "name": "Kimi K2.6", "score": 54, "price": 0.70, "speed": 972, "price_blended_usd_per_1m": 0.70 },
    "deepseek": { "name": "DeepSeek V4 Pro (Max)", "score": 52, "price": 0.71, "speed": 302, "price_blended_usd_per_1m": 0.71 }
  },
  "suggested_first": "openai"
}

Response (native client — e.g., Claude Code):

{
  "tier": "HEAVY",
  "updated_at": "2026-05-20",
  "data_source": "fallback",
  "client_detected": "claude-code",
  "client_type": "native",
  "native_provider": "anthropic",
  "client_label": "Claude Code",
  "models": {
    "anthropic": { "name": "Claude Opus 4.7 (max)", "score": 57, "price": 4.10, "speed": 512, "price_blended_usd_per_1m": 4.10 }
  },
  "suggested_first": "anthropic"
}

format_plan_block

Generates the formatted classification block to append at the end of a plan.

Parameters:

Parameter	Type	Required	Description
tier	"LIGHT" | "MEDIUM" | "HEAVY"	Yes	Complexity tier
reason	string	Yes	Technical reason for classification
estimated_files	string	Yes	Estimated files affected
estimated_tokens	string	Yes	Estimated tokens to generate
preferred_provider	string	No	Provider to highlight

Response:

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
📋 TASK CLASSIFICATION
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Tier     : MEDIUM
Reason   : Inclusion of complex business rules/validations
Files    : ~2–5 files | ~200–800 tokens generated
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
🤖 SUGGESTED MODELS FOR EXECUTION (OpenCode)
GPT       : GPT-5.4 mini (xhigh) ✨ (Suggested for your environment)
DeepSeek  : DeepSeek V4 Flash (Max)
Gemini    : Gemini 3 Flash
GLM       : GLM-5
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

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How It Works

Oracle Models ensures you use the right AI model for the right job. It distinguishes between planning (designing the solution) and execution (actually writing the code or configuring the system).

Recommended workflow (MCP tools available)

1. The AI produces a multi-step action plan.
2. Classification: The AI calls classify_task to evaluate the complexity of EXECUTING the plan it just wrote.
3. Suggestion: The AI calls get_model_suggestions to find the best models for that specific execution tier. Client auto-detection filters the results.
4. Integration: The AI appends the formatted classification block at the end of the response.

Fallback workflow (skill only, no MCP)

If the MCP server is not configured, the skill contains the full classification criteria and model tables. The AI classifies manually using the rules defined in SKILL.md.

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Classification Engine

The classification ALWAYS refers to the complexity of executing the plan. The engine uses a weighted scoring system with a pessimistic top-down decision flow.

Decision Flow (top-down, pessimistic)

1. Critical domain match? → HEAVY (stops here)
2. Description length > 3000 chars? → HEAVY (stops here)
3. Accumulated score >= 40? → HEAVY
4. Accumulated score >= 20? → MEDIUM
5. Penalty keywords OR (files >= 2 AND criteriaScore >= 5)? → MEDIUM
6. Otherwise → LIGHT

Important: The files >= 2 safety net requires criteriaScore >= 5 — at least one criterion must match. Tasks with zero criteria matches remain LIGHT even if affecting multiple files.

Critical Domains (automatic HEAVY)

Any match forces HEAVY regardless of other criteria: auth/security, payment/billing/financial, schema migration/database, cryptography, compliance (LGPD/GDPR), architecture redesign, non-deterministic debugging, data pipeline/ETL.

Penalty Keywords (disqualify LIGHT)

These terms prevent LIGHT classification: export interface/type/enum, public api, breaking change, import from shared/core, entry files (index.ts, types.ts, main.ts), state management (Redux, Zustand, Context API), database terms, secrets/credentials.

Scoring Overview

HEAVY criteria (+25-30 pts each): Architectural changes, auth/security, external integration, non-deterministic bugs, DB migration, performance profiling, billing/payment, data pipelines, state management architecture, wide-scope refactoring.

MEDIUM criteria (+10-15 pts each): New component with state, signature change, complex validation, new endpoint, hook/composable, feature flag, data migration, pagination/filter/sort, bug fix, Docker/infra, test suite, config changes, error handling, code restructuring, third-party API integration.

LIGHT criteria (+3-5 pts each): Literal value change, CSS/style, safe rename, form field, route adjust, translation/i18n, documentation, dependency update, typo.

Entropy bonuses: Description > 1500 chars (+15), > 3000 chars (auto HEAVY). Files >= 5 (+30), >= 3 (+15), >= 2 (+5).

English-Only Patterns

All classification patterns are in English. Before calling classify_task, normalize non-English task descriptions to English (e.g., "validação de email" → "email validation"). This ensures patterns match correctly.

LIGHT Sanitary Filter

A task is only LIGHT if it passes ALL: no penalty keywords, < 2 files, criteriaScore < 5, total score < 20, no critical domain match.

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Cache and Offline Support

Model data follows a 3-tier data strategy:

1. Cache — check ~/.oracle-models/cache.json (7-day TTL)
2. Live — fetch from Artificial Analysis API v2 (requires AA_API_KEY)
3. Fallback — use bundled data/fallback.json

If the remote source is unreachable or no API key is configured, the server transparently uses fallback data.

Live Data Setup (Optional)

To enable live model data updates from Artificial Analysis:

1. Create a free account at https://artificialanalysis.ai/login
2. Generate an API key in the Insights Platform
3. Set the AA_API_KEY environment variable:

export AA_API_KEY=your_api_key_here

Or configure in your MCP setup:

{
  "mcpServers": {
    "oracle-models": {
      "command": "npx",
      "args": ["-y", "oracle-models-mcp"],
      "env": {
        "AA_API_KEY": "your_api_key_here"
      }
    }
  }
}

• Rate limit: 1,000 requests/day (free tier)
• Cache: 7 days locally
• Attribution: Data sourced from artificialanalysis.ai
• Without API key: The server uses bundled fallback data (updated periodically)

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Why Reinforce in Agent Instructions?

AI agents are autonomous — they choose whether or not to call MCP tools. No skill can force them.

Oracle Models injects behavioral instructions into the agent's context, telling it when and how to classify tasks. However:

• The agent decides whether to follow these instructions on each turn.
• Compliance varies by model, provider, context window, conversation history, and agent configuration.
• Even when the skill says "mandatory," the agent may skip the workflow — intentionally or by oversight.
• This is not a bug. It is inherent to how LLM-based agents work: they interpret instructions, they do not execute them deterministically.

How to increase compliance

Add the reinforcement block below to your project's agent instruction file. This gives the agent two independent signals — one from the skill, one from your instructions — significantly increasing the chance it follows through.

Where to add it:

• OpenCode: AGENTS.md (global or per-project)
• Claude Code: CLAUDE.md
• Gemini CLI: GEMINI.md
• Cursor: .cursorrules
• Windsurf: .windsurfrules
• Cline: .clinerules
• Roo Code: .roorules
• Codex: AGENTS.md or codex.md

Reinforcement template

Copy and paste this block into your agent's instruction file:

## Oracle Models — Mandatory Plan Classification

**RULE:** Every time my response contains a sequence of implementation steps (Step 1, Step 2... or a list of actions the user will execute), I MUST finalize the response with the Oracle Models classification block.

**NOT required** when: response is explanation only, conversation, or direct code edit without a prior plan.

**Mandatory workflow at the end of every plan:**
1. **Normalize description to English** (if task is in another language, translate core intent: "traduzir" → "translate", "validação de email" → "email validation")
2. Call `oracle-models > classify_task` with a description of the EXECUTION (not the planning)
3. Call `oracle-models > get_model_suggestions` with the returned tier
4. Compose and append the block below at the end of the response:

### TASK CLASSIFICATION
- **Tier:** `[LIGHT | MEDIUM | HEAVY]`
- **Reason:** [Technical phrase referencing the determining criteria of the plan's EXECUTION]
- **Estimated Scope:** ~[N] files | ~[N] tokens generated

### SUGGESTED MODELS FOR EXECUTION
[Provider] : [model] | [Provider] : [model] | ...

> **Note:** The classification refers to the complexity of **executing** this plan, not creating it.

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Development

npm install
npm run build
npm run start

Publishing

The MCP server is published on npm as oracle-models-mcp:

npm run build
npm publish

The skill is distributed via GitHub and skills.sh. Users install with:

npx skills add vanppsa/oracle-models -g -y

No manual registration is needed — skills appear on the leaderboard automatically as users install them via the CLI.

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License

MIT