feat: add Tzafon model provider

[eddieogola]

Summary

• Re-exports tzafon model creator from @inngest/ai, making Tzafon a first-class model provider in AgentKit
• Adds a custom Tzafon adapter that strips tools and tool_choice from requests, since Tzafon rejects them with HTTP 400
• Adds Tzafon format handler for Authorization: Bearer auth in model.ts

Files changed

File	Change
packages/agent-kit/src/models.ts	Add tzafon to the re-export from @inngest/ai
packages/agent-kit/src/adapters/tzafon.ts	New adapter — wraps OpenAI parsers, strips tools/tool_choice
packages/agent-kit/src/adapters/index.ts	Register Tzafon adapter
packages/agent-kit/src/model.ts	Add tzafon format handler (Bearer auth)

Usage

import { createAgent, createNetwork, tzafon } from "@inngest/agent-kit";

const agent = createAgent({
  name: "assistant",
  system: "You are a helpful assistant.",
  model: tzafon({ model: "tzafon.sm-1" }),
});

Why a custom adapter?

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

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

The adapter follows the same pattern as Grok (wraps OpenAI parsers with format-specific modifications), but instead of disabling strict mode, it removes tools and tool_choice entirely.

Dependency

This PR depends on inngest/inngest-js#1309, which adds the tzafon() model creator and "tzafon" format to @inngest/ai. That PR must be merged and released first, then @inngest/ai should be bumped in packages/agent-kit/package.json before this PR can be merged.

Test plan

• Merge upstream dependency inngest/inngest-js#1309 first
• Bump @inngest/ai to the version containing tzafon
• pnpm build compiles successfully
• pnpm test passes
• Verify tzafon() is importable from @inngest/agent-kit
• Verify requests to Tzafon API do not include tools or tool_choice

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Latest commit: 29a5f47

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

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Name	Type
@inngest/agent-kit	Minor

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