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import { randomUUID } from "node:crypto";
import { createAnthropic } from "@ai-sdk/anthropic";
import { createOpenAICompatible } from "@ai-sdk/openai-compatible";
import type { LanguageModelV3 } from "@ai-sdk/provider";
import type { FetchFunction } from "@ai-sdk/provider-utils";
import { getAnthropicBetas } from "../credentials/anthropic-betas.js";
import { transformClaudeOAuthBody } from "./anthropic-oauth-transform.js";
import { wrapFetchWithLogging } from "./debug-logger.js";
export interface ProviderConfig {
apiKey: string;
baseURL: string;
provider?: string;
claudeCredentials?: {
accessToken: string;
};
/** Optional tab id for labelling debug logs. No effect when
* `DISPATCH_DEBUG_LLM` is unset. */
tabId?: string;
}
const MCP_PREFIX = "mcp_";
function prefixToolName(name: string): string {
return `${MCP_PREFIX}${name.charAt(0).toUpperCase()}${name.slice(1)}`;
}
function unprefixToolName(name: string): string {
if (name.startsWith(MCP_PREFIX)) {
const rest = name.slice(MCP_PREFIX.length);
return `${rest.charAt(0).toLowerCase()}${rest.slice(1)}`;
}
return name;
}
// Explicit factory return type so the inferred type doesn't leak references
// into transitive `@ai-sdk/provider` paths (which would trip TS2742).
// `@ai-sdk/anthropic` v3.x and `@ai-sdk/openai-compatible` v2.x both return
// `LanguageModelV3`-spec models; `wrapLanguageModel` likewise.
export type ModelFactory = (modelId: string) => LanguageModelV3;
export function createProvider(config: ProviderConfig): ModelFactory {
if (config.provider === "anthropic") {
return createClaudeOAuthProvider(config);
}
if (config.provider === "opencode-anthropic") {
return createApiKeyAnthropicProvider(config);
}
// Default: OpenAI-compatible provider (OpenCode Zen — DeepSeek, GLM,
// Kimi, MiniMax, etc.).
//
// `@ai-sdk/[email protected]` handles reasoning round-tripping
// natively: it reads `{ type: "reasoning", text }` parts from each
// assistant message's content and emits them as `reasoning_content`
// on the wire (see node_modules/@ai-sdk/openai-compatible/dist/index.mjs
// lines 215-216 and 245). Our `toModelMessages` in agent.ts already
// emits reasoning parts from `ThinkingChunk`s, so no middleware is
// needed.
//
// (The v4-era `normalizeMessages` middleware that lived here was
// actively breaking DeepSeek: it stripped reasoning parts from
// content AND wrote them under `providerMetadata` — wrong key in v3
// prompts, which use `providerOptions`. The result was that
// reasoning_content never reached the wire and DeepSeek rejected the
// follow-up turn with "must be passed back".)
//
// Debug logging: when DISPATCH_DEBUG_LLM is set, wrap the base fetch
// so every wire request/response (including SSE chunks) is captured.
// When disabled, `wrapFetchWithLogging` returns the input unchanged
// (zero overhead).
const loggingFetch = wrapFetchWithLogging(globalThis.fetch, {
tabId: config.tabId,
modelHint: "opencode-zen",
}) as unknown as FetchFunction;
const provider = createOpenAICompatible({
name: "opencode-zen",
apiKey: config.apiKey,
baseURL: config.baseURL,
fetch: loggingFetch,
});
return (modelId: string) => provider(modelId);
}
/**
* Claude OAuth provider. Used by Dispatch's `anthropic` provider keys
* (claude-pro, claude-max). Uses `authToken` to send `Authorization: Bearer`
* (natively supported by `@ai-sdk/anthropic` v3.x), and mimics Claude Code CLI
* request headers so the request bills against the user's Claude subscription.
*
* The `anthropic-beta` header is REQUIRED here. `@ai-sdk/anthropic` only emits
* an `anthropic-beta` header for betas it auto-derives from tool definitions
* (computer-use, structured-outputs, etc.) — it does NOT add the prompt-caching
* or oauth betas on its own. Without `prompt-caching-scope-2026-01-05` the API
* silently ignores every `cache_control` breakpoint we attach to messages,
* giving a 0% cache hit rate and a massive token burn (see notes/claude-report.md).
* The SDK folds any `anthropic-beta` it finds on the provider's config headers
* back into its own beta set (via `getBetasFromHeaders`), so the values here
* are merged — not overwritten — with any tool-derived betas.
*/
function createClaudeOAuthProvider(config: ProviderConfig): ModelFactory {
// Stable per-provider session id — mirrors the Claude Code CLI, which sends
// the same `X-Claude-Code-Session-Id` across a session's requests.
const sessionId = randomUUID();
// Wrap the base fetch FIRST so the logging wrapper sees the genuine
// outgoing HTTP body — i.e. AFTER the OAuth body transform and AFTER the
// Claude-Code session headers have been stamped on. Order matters: if we
// wrapped the inner `baseFetch` instead, the logs would show the pre-
// transform body and miss the session headers, defeating the point of
// capturing the wire for cache/billing debugging.
const baseFetch = wrapFetchWithLogging(globalThis.fetch, {
tabId: config.tabId,
modelHint: "claude-oauth",
});
// Custom fetch that (1) restructures the request body into the genuine
// Claude Code system layout — required for Anthropic to bill correctly and
// apply the prompt-cache scope (see anthropic-oauth-transform.ts) — and
// (2) stamps the Claude Code session/request id headers the real CLI sends.
// Cast through `unknown`: `FetchFunction` is `typeof globalThis.fetch`, whose
// (Bun) type carries a `preconnect` member a plain wrapper can't satisfy.
const oauthFetch = (async (
input: Parameters<FetchFunction>[0],
init?: Parameters<FetchFunction>[1],
) => {
const nextInit: RequestInit = { ...init };
if (init?.body != null) {
nextInit.body = transformClaudeOAuthBody(init.body) ?? init.body;
}
const headers = new Headers(init?.headers);
headers.set("X-Claude-Code-Session-Id", sessionId);
if (!headers.has("x-client-request-id")) {
headers.set("x-client-request-id", randomUUID());
}
nextInit.headers = headers;
return baseFetch(input, nextInit);
}) as unknown as FetchFunction;
const anthropic = createAnthropic({
baseURL: config.baseURL || "https://api.anthropic.com/v1",
authToken: config.claudeCredentials?.accessToken ?? config.apiKey,
fetch: oauthFetch,
headers: {
"anthropic-beta": getAnthropicBetas().join(","),
"anthropic-dangerous-direct-browser-access": "true",
"x-app": "cli",
"user-agent": "claude-cli/2.1.112 (external, sdk-cli)",
},
});
return (modelId: string) => anthropic(modelId);
}
/**
* Plain-API-key Anthropic-format provider. Used to hit gateways that speak
* Anthropic's `/messages` protocol with a standard `x-api-key` header — most
* importantly OpenCode Go's MiniMax and Qwen routes. Unlike the Claude OAuth
* variant, no `claudeCredentials` are present, no Claude Code mimicry headers
* are sent, and the API key is passed verbatim through the SDK's default
* authentication path.
*/
function createApiKeyAnthropicProvider(config: ProviderConfig): ModelFactory {
const loggingFetch = wrapFetchWithLogging(globalThis.fetch, {
tabId: config.tabId,
modelHint: "opencode-anthropic",
}) as unknown as FetchFunction;
const anthropic = createAnthropic({
apiKey: config.apiKey,
baseURL: config.baseURL || "https://opencode.ai/zen/go/v1",
fetch: loggingFetch,
});
return (modelId: string) => anthropic(modelId);
}
export { prefixToolName, unprefixToolName };
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