feat(ai): add Tzafon as a model provider

[eddieogola]

Summary

• Adds a tzafon() model creator to @inngest/ai for Tzafon, an OpenAI-compatible LLM provider
• Adds a custom "tzafon" format (following the Grok pattern) since Tzafon rejects tools/tool_choice parameters with HTTP 400
• Adds TZAFON_API_KEY env key and exports from indexes

Files changed

File	Change
packages/ai/src/models/tzafon.ts	New model creator with format: "tzafon"
packages/ai/src/adapters/tzafon.ts	New adapter interface extending AiAdapter
packages/ai/src/adapter.ts	Add "tzafon" to Format union and AiAdapters map
packages/ai/src/adapters/index.ts	Export TzafonAiAdapter
packages/ai/src/models/index.ts	Export tzafon model
packages/ai/src/env.ts	Add TzafonApiKey = "TZAFON_API_KEY"

Why a custom format instead of reusing openai-chat?

Tzafon is OpenAI-compatible for chat completions but does not support tool/function calling. When tools is included in a request, the API returns:

HTTP 400: "auto" tool choice requires --enable-auto-tool-choice and --tool-call-parser to be set

A custom "tzafon" format allows agent-kit to register a dedicated adapter that strips tools and tool_choice from requests (same pattern as Grok, which uses its own format to disable strict mode).

Usage

import { tzafon } from "@inngest/ai";

const model = tzafon({ model: "tzafon.sm-1" });
// => { url: "https://api.tzafon.ai/v1/chat/completions", format: "tzafon", ... }

Downstream PR

The corresponding agent-kit adapter PR is inngest/agent-kit#289.

Test plan

• pnpm build compiles successfully
• pnpm test — all 41 existing tests pass
• Runtime verification: tzafon({ model: "tzafon.sm-1" }) returns correct adapter shape with format: "tzafon"
• Live API test: chat completion request succeeds against https://api.tzafon.ai/v1

🤖 Generated with Claude Code

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Note

Adds Tzafon as a new OpenAI-compatible model provider to @inngest/ai. Introduces a custom "tzafon" format (mirroring the Grok pattern) to allow downstream adapters to strip tools/tool_choice fields that Tzafon rejects with HTTP 400. Includes the model creator, adapter interface, env key, changeset, and all necessary index exports.

^{Written by Mendral for commit cc6b9f5.}

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Latest commit: def8ffb

The changes in this PR will be included in the next version bump.

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Name	Type
@inngest/ai	Minor

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