@corbits/openai-responses

An @intx/inference provider adapter for the OpenAI Responses API (/v1/responses): SSE and JSON responses, text, tool calls, image and PDF input, and reasoning replay. An inference provider for Corbits and Interchange agents that also works in any host that runs @intx/inference.

Why @corbits/openai-responses?

1. One adapter for every Responses backend. OpenAI, Codex, xAI and Ollama's /v1 differ in paths, headers and body fields. Those differences are a JSON quirks object on the source, not forked code.
2. Reasoning survives across turns. Encrypted reasoning items are tagged with the provider that issued them. They are replayed only to the same provider and model, so multi-turn reasoning keeps its context and the backend never rejects a signature it did not issue.
3. Interchange error and retry semantics. Requests run through runInference, so rate limits, pacing headers and auth failures behave the same as for the built-in providers.

It speaks only the Responses protocol. For Chat Completions, use the built-in OpenAI adapter in @intx/inference.

Install

bun add @corbits/openai-responses @intx/inference@^0.4.0 @intx/types@^0.4.0

Runs on Bun >= 1.2 or Node >= 24.

Quickstart

Needs OPENAI_API_KEY set.

import { createDependencies, runInference } from "@intx/inference";
import {
  createOpenAIResponsesAdapter,
  OPENAI_RESPONSES_PROVIDER,
} from "@corbits/openai-responses";

const deps = createDependencies({
  has: (provider) => provider === OPENAI_RESPONSES_PROVIDER,
  resolve: (source, quirks) => createOpenAIResponsesAdapter(source, quirks),
});

let seq = 0;
for await (const event of runInference({
  deps,
  source: {
    id: "openai",
    provider: OPENAI_RESPONSES_PROVIDER,
    baseURL: "https://api.openai.com/v1",
    credentialId: "OPENAI_API_KEY",
    model: "gpt-5-mini",
  },
  turns: [
    {
      role: "user",
      timestamp: Date.now(),
      content: [{ type: "text", text: "Say hello." }],
    },
  ],
  nextSeq: () => seq++,
  readMaterial: (id) => {
    const secret = process.env[id];
    if (secret === undefined) throw new Error(`${id} is not set`);
    return { secret };
  },
})) {
  if (event.type === "inference.text.delta")
    process.stdout.write(event.data.token);
  if (event.type === "inference.error")
    throw new Error(event.data.error.message);
}
process.stdout.write("\n");

Where it fits

Interchange runs AI agents as principals (accounts that hold their own identity, permissions and credentials). Corbits packages add what an agent product needs around it.

• Runs in: the agent sidecar (the runtime next to each agent), or any process that calls runInference. No hub is required.
• Plugs into: the @intx/inference adapter registry, as the factory for the openai-responses provider id.
• Pairs with: @corbits/ollama-adapter and @corbits/system-one, the other Corbits inference providers.

Reference

Export	Description
createOpenAIResponsesAdapter	AdapterFactory. Reads quirks from the source on every resolve.
responsesAdapterFactory(quirks, hooks?)	Returns an AdapterFactory with fixed quirks. Any per-source quirks are ignored.
OPENAI_RESPONSES_PROVIDER	The "openai-responses" provider id.
OPENAI_COMPATIBLE_RESPONSES_PROVIDER	Deprecated "openai-compatible-responses" id from 0.1. Removed in 0.3.0.
responsesAdapterFactories	Record mapping both provider ids to createOpenAIResponsesAdapter.
ResponsesQuirks	Schema and type for the quirks object.
ResponsesHooks	Code hooks: wrapSystemPrompt, includeReasoningEffort.

Quirks

Every field is optional. An absent field keeps the protocol default. Unknown keys are rejected.

Quirk	Type	Default	Effect on the request
path	string	"/responses"	Request path appended to the source's baseURL.
headers.static	Record<string, string>	{}	Header names are lowercased; they override the stock headers. authorization is rejected.
headers.modelHeader	string	unset	Header name that carries the model id.
headers.fromOption	{ optionKey, header }[]	[]	Copies each non-empty string providerOptions[optionKey] into header.
sessionIdOption	string	unset	providerOptions key whose value is sent as prompt_cache_key.
sessionIdHeader	string	unset	Also sends that session id in this header. Ignored without sessionIdOption.
systemPrompt	{ role: "system" | "developer", shape: "string" | "parts" }	{ role: "system", shape: "string" }	Role and content shape of the leading system-prompt item.
contentShape	"typed" | "flat"	"typed"	flat sends text-only content as a plain string instead of typed parts.
parallelToolCalls	boolean	unset	Unset omits parallel_tool_calls; a boolean is sent as given.
maxOutputTokens	boolean	true	false omits max_output_tokens even when the caller sets maxTokens.
temperature	boolean	true	false omits temperature even when the caller sets it.
store	boolean	false	Sent as store.
stream	boolean	true	Sent as stream; false also sends accept: application/json.
reasoning.summary	"auto" | "detailed"	unset	Sent as reasoning.summary.
reasoning.effortOption	string	unset	providerOptions key whose value is sent as reasoning.effort.
instructions	string	unset	Sent as instructions.

Using with Interchange

Interchange loads custom adapters from an operator-configured AdapterManifest. Add one entry per provider id you serve:

import { createDependencies, type AdapterManifest } from "@intx/inference";
import { loadAdapterRegistry } from "@intx/inference/providers";

const manifest: AdapterManifest = [
  {
    provider: "openai-responses",
    specifier: "@corbits/openai-responses",
    export: "createOpenAIResponsesAdapter",
  },
  {
    provider: "openai-compatible-responses",
    specifier: "@corbits/openai-responses",
    export: "createOpenAIResponsesAdapter",
  },
];
const deps = createDependencies(await loadAdapterRegistry(manifest));

Pass deps to runInference. Sources with provider: "openai-responses" (or the deprecated "openai-compatible-responses") then resolve to this adapter, and each source's quirks configures its backend. To serve a vendor under its own id, add another entry with that provider and the same export. Manifest entries override built-in adapters with the same id, so don't reuse openai or another built-in id.

For a vendor that needs code hooks, bake its quirks into a factory in your own module and point a manifest entry at that export:

import { responsesAdapterFactory } from "@corbits/openai-responses";

export const createVendorAdapter = responsesAdapterFactory(
  { path: "/v1/responses", contentShape: "flat", temperature: false },
  { wrapSystemPrompt: (prompt) => `<system>${prompt}</system>` },
);

Its manifest entry names your module and that export, for example { provider: "vendor-responses", specifier: "./vendor-adapter.js", export: "createVendorAdapter" }.

Upgrading from 0.1

• No host change is needed. responsesAdapterFactories still maps openai-compatible-responses to createOpenAIResponsesAdapter, so sources stored under that id keep resolving and running.
• OPENAI_COMPATIBLE_RESPONSES_PROVIDER is deprecated and removed in 0.3.0. Move stored sources to openai-responses before then.
• isResponsesStreamTerminal is no longer exported. The adapter still applies it.
• @intx/inference and @intx/types peers are now ^0.4.0.
• Quirks and reasoning signatures are unchanged.

License

LGPL-2.1-only