FrostClaw — Snowflake Cortex Plugin for OpenClaw

An OpenClaw provider plugin that routes LLM requests through Snowflake Cortex AI. Claude models go to the Anthropic Messages API, everything else goes to the OpenAI-compatible Chat Completions API — both behind a single Snowflake PAT.

Supported Models

Claude (Anthropic Messages API)

Model ID	Context	Notes
claude-opus-4-5	200k
claude-sonnet-4-5	200k
claude-opus-4-6	200k
claude-sonnet-4-6	200k
claude-opus-4-6-1m	1M	Opt-in via context-1m beta header
claude-sonnet-4-6-1m	1M	Opt-in via context-1m beta header

The -1m variants are virtual — the plugin strips the suffix before sending to Snowflake and attaches the context-1m-2025-08-07 beta header automatically.

OpenAI (Chat Completions API)

Model ID	Context
openai-gpt-5	128k
openai-gpt-5-mini	128k
openai-gpt-5-nano	128k
openai-gpt-4-1	1M

Open-Source (Chat Completions API)

Model ID	Context
llama4-maverick	1M
llama3.1-405b	128k
llama3.1-70b	128k
llama3.1-8b	128k
mistral-large	32k
mistral-large2	128k
deepseek-r1	64k
snowflake-arctic	4k

Tool calling is supported for Claude and OpenAI models. Open-source models have tools stripped automatically.

Setup

Prerequisites

• A self-hosted OpenClaw instance
• A Snowflake account with Cortex AI enabled
• A Programmatic Access Token (PAT) for your Snowflake account

Environment Variables

Variable	Required	Description
SNOWFLAKE_PAT	Yes	Snowflake Programmatic Access Token
SNOWFLAKE_BASE_URL	Yes	Account URL, e.g. https://my-account.snowflakecomputing.com

SNOWFLAKE_CORTEX_API_KEY is accepted as a fallback for SNOWFLAKE_PAT.

Install

Copy the plugin into your OpenClaw extensions directory:

cp -r . ~/.openclaw/extensions/snowflake-cortex/

Set the environment variables (in your shell profile, .env, or openclaw.json), then restart OpenClaw.

Build from Source

bun install
bun run build

This produces dist/index.js.

How It Works

• Claude models → Anthropic Messages API at /api/v2/cortex/v1/messages
• Everything else → OpenAI Chat Completions at /api/v2/cortex/v1/chat/completions
• Auth is handled via X-Snowflake-Authorization-Token-Type: PROGRAMMATIC_ACCESS_TOKEN header
• Snowflake Cortex beta headers (interleaved thinking, 128k output, effort control, token-efficient tools) are attached to all Claude requests automatically
• Models that don't support tool calling have tools stripped via the normalizeToolSchemas hook
• Orphaned tool use/result pairs are repaired for Claude via buildReplayPolicy

License

MIT — see LICENSE.