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fix(providers): strip trailing /v1 from Anthropic baseUrl to prevent double-path

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The pi-ai Anthropic provider constructs the full API endpoint as
`${baseUrl}/v1/messages`. If a user configures
`models.providers.anthropic.baseUrl` with a trailing `/v1`
(e.g. "https://api.anthropic.com/v1"), the resolved URL becomes
"https://api.anthropic.com/v1/v1/messages" which the Anthropic API
rejects with a 404 / connection failure.

This regression appeared in v2026.2.22 when @mariozechner/pi-ai bumped
from 0.54.0 to 0.54.1, which started appending the /v1 segment where
the previous version did not.

Fix: in normalizeModelCompat(), detect anthropic-messages models and
strip a single trailing /v1 (with optional trailing slash) from the
configured baseUrl before it is handed to pi-ai. Models with baseUrls
that do not end in /v1 are unaffected. Non-anthropic-messages models
are not touched.

Adds 6 unit tests covering the normalisation scenarios.

Fixes #24709

(cherry picked from commit 4c4857fdcb)
This commit is contained in:
zerone0x
2026-02-23 21:42:36 +01:00
committed by Peter Steinberger
parent 01c1f68ab3
commit ac6cec7677
2 changed files with 85 additions and 0 deletions
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26
src/agents/model-compat.ts
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@@ -12,8 +12,34 @@ function isDashScopeCompatibleEndpoint(baseUrl: string): boolean {
);
}
function isAnthropicMessagesModel(model: Model<Api>): model is Model<"anthropic-messages"> {
return model.api === "anthropic-messages";
}
/**
* pi-ai constructs the Anthropic API endpoint as `${baseUrl}/v1/messages`.
* If a user configures `baseUrl` with a trailing `/v1` (e.g. the previously
* recommended format "https://api.anthropic.com/v1"), the resulting URL
* becomes "…/v1/v1/messages" which the Anthropic API rejects with a 404.
*
* Strip a single trailing `/v1` (with optional trailing slash) from the
* baseUrl for anthropic-messages models so users with either format work.
*/
function normalizeAnthropicBaseUrl(baseUrl: string): string {
return baseUrl.replace(/\/v1\/?$/, "");
}
export function normalizeModelCompat(model: Model<Api>): Model<Api> {
const baseUrl = model.baseUrl ?? "";
// Normalise anthropic-messages baseUrl: strip trailing /v1 that users may
// have included in their config. pi-ai appends /v1/messages itself.
if (isAnthropicMessagesModel(model) && baseUrl) {
const normalised = normalizeAnthropicBaseUrl(baseUrl);
if (normalised !== baseUrl) {
return { ...model, baseUrl: normalised } as Model<"anthropic-messages">;
}
}
const isZai = model.provider === "zai" || baseUrl.includes("api.z.ai");
const isMoonshot =
model.provider === "moonshot" ||