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fix: normalize Codex Responses request body for compat with LiteLLM/Anthropic clients #7

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21 changes: 21 additions & 0 deletions packages/openai-oauth-core/src/transport.ts
View file Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -218,6 +218,27 @@ export const normalizeCodexResponsesBody = (
}

delete normalized.max_output_tokens
// Codex backend rejects these params; strip for compatibility with LiteLLM/Anthropic-format clients.
delete normalized.user
delete normalized.temperature
delete normalized.top_p

// LiteLLM translates Anthropic's web_search server tool to OpenAI's public name
// (web_search_preview). The Codex backend uses the internal name (web_search) and
// requires external_web_access:true to perform live searches (default is cached mode).
let renamedWebSearch = false
if (Array.isArray(normalized.tools)) {
normalized.tools = (normalized.tools as unknown[]).map((t) => {
if (t && typeof t === "object" && (t as Record<string, unknown>).type === "web_search_preview") {
renamedWebSearch = true
return { ...(t as Record<string, unknown>), type: "web_search", external_web_access: true }
}
return t
})
}
if (renamedWebSearch && normalized.tool_choice && normalized.tool_choice !== "none") {
normalized.tool_choice = "auto"
}

return normalized
}
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79 changes: 79 additions & 0 deletions packages/openai-oauth-core/test/transport.test.ts
View file Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -95,6 +95,85 @@ describe("normalizeCodexResponsesBody", () => {

expect(normalized.store).toBe(false)
})

test("strips params the Codex backend rejects", () => {
const normalized = normalizeCodexResponsesBody({
model: "gpt-5.3-codex-spark",
user: "user-123",
temperature: 0.2,
top_p: 0.9,
})

expect(normalized).not.toHaveProperty("user")
expect(normalized).not.toHaveProperty("temperature")
expect(normalized).not.toHaveProperty("top_p")
})

test("renames web_search_preview to web_search with external_web_access", () => {
const normalized = normalizeCodexResponsesBody({
model: "gpt-5.4",
tools: [
{ type: "web_search_preview" },
{ type: "function", name: "other", parameters: {} },
],
})

expect(normalized.tools).toEqual([
{ type: "web_search", external_web_access: true },
{ type: "function", name: "other", parameters: {} },
])
})

test("resets tool_choice to auto when renaming web_search_preview", () => {
const normalized = normalizeCodexResponsesBody({
model: "gpt-5.4",
tools: [{ type: "web_search_preview" }],
tool_choice: { type: "function", name: "ignored" },
})

expect(normalized.tool_choice).toBe("auto")
})

test("leaves tool_choice 'none' intact even when renaming", () => {
const normalized = normalizeCodexResponsesBody({
model: "gpt-5.4",
tools: [{ type: "web_search_preview" }],
tool_choice: "none",
})

expect(normalized.tool_choice).toBe("none")
})

test("does not touch tool_choice when no web_search_preview tool is present", () => {
const toolChoice = { type: "function", name: "my_tool" }
const normalized = normalizeCodexResponsesBody({
model: "gpt-5.4",
tools: [{ type: "function", name: "my_tool", parameters: {} }],
tool_choice: toolChoice,
})

expect(normalized.tool_choice).toEqual(toolChoice)
})

test("preserves other web search config keys when renaming", () => {
const normalized = normalizeCodexResponsesBody({
model: "gpt-5.4",
tools: [
{
type: "web_search_preview",
search_context_size: "medium",
},
],
})

expect(normalized.tools).toEqual([
{
type: "web_search",
search_context_size: "medium",
external_web_access: true,
},
])
})
})

describe("createCodexOAuthFetch", () => {
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