decolua/9router · error

Vertex: could not resolve project_id from API key. Please ad

Error message

Vertex: could not resolve project_id from API key. Please add it manually in provider settings.

What it means

Thrown in VertexExecutor.execute (open-sse/executors/vertex.js:157) when a 'vertex-partner' connection uses a raw API key (no SA JSON, no ADC, no providerSpecificData.projectId) and the automatic project-ID resolution fails. resolveProjectId sends a probe request to the Vertex publisher endpoint with the key and parses projects/{id} out of Google's error message; if that extraction finds nothing, execution stops here.

Source

Thrown at open-sse/executors/vertex.js:157

      credentials.accessToken = result.accessToken;
    }

    // ADC user credential flow: refresh Bearer token via Google OAuth2 token endpoint
    if (adcJson) {
      const result = await refreshGoogleToken(
        adcJson.refresh_token,
        adcJson.client_id,
        adcJson.client_secret,
        log
      );
      if (!result?.accessToken) throw new Error("Vertex: failed to refresh access token from ADC JSON (authorized_user)");
      credentials.accessToken = result.accessToken;
    }

    // vertex-partner with raw key: auto-resolve project_id if not provided
    if (this.provider === "vertex-partner" && !saJson && !adcJson && !credentials?.providerSpecificData?.projectId) {
      const projectId = await resolveProjectId(credentials.apiKey);
      if (!projectId) throw new Error("Vertex: could not resolve project_id from API key. Please add it manually in provider settings.");
      log?.debug?.("VERTEX", `Resolved project_id: ${projectId}`);
      credentials.providerSpecificData = { ...credentials.providerSpecificData, projectId };
    }

    const url = this.buildUrl(model, stream, 0, credentials);
    const headers = this.buildHeaders(credentials, stream);
    const transformedBody = this.transformRequest(model, body, stream, credentials);

    const response = await proxyAwareFetch(url, {
      method: "POST",
      headers,
      body: JSON.stringify(transformedBody),
      signal,
    }, proxyOptions);

    return { response, url, headers, transformedBody };
  }
}

View on GitHub (pinned to 90b52e06ff)

Solutions

1. Manually set projectId in the Vertex partner provider's settings (providerSpecificData.projectId) — this is exactly what the error message asks for and skips auto-resolution entirely.
2. Verify the API key is valid (try a curl to the Vertex endpoint with ?key=...) — invalid keys won't yield a parseable project path.
3. Check network/proxy access to https://aiplatform.googleapis.com; the probe must get a JSON error body containing projects/{id}.
4. Alternatively switch to a Service Account JSON credential, which carries project_id natively.

Example fix

// before
{ "apiKey": "AQ.Ab8R..." }
// after
{ "apiKey": "AQ.Ab8R...", "providerSpecificData": { "projectId": "my-gcp-project" } }

if (provider === "vertex-partner" && !parseVertexSaJson(creds?.apiKey) && !parseVertexAdcJson(creds?.apiKey) && !creds?.providerSpecificData?.projectId) {
  console.warn("vertex-partner: no projectId — auto-resolution may fail; set providerSpecificData.projectId");
}

function canResolveVertexPartnerProject(creds) {
  return Boolean(parseVertexSaJson(creds?.apiKey) || parseVertexAdcJson(creds?.apiKey) || (typeof creds?.providerSpecificData?.projectId === "string" && creds.providerSpecificData.projectId.trim()));
}

try {
  await chat(model, body);
} catch (e) {
  if (/could not resolve project_id from API key/.test(e.message)) {
    showProjectIdSettingsPrompt();
  } else throw e;
}

When it happens

Trigger: provider is 'vertex-partner', apiKey is a raw key, providerSpecificData.projectId is unset, and the resolveProjectId probe either fails to reach aiplatform.googleapis.com, returns a non-JSON body, or returns an error message that does not contain 'projects/{id}/' (e.g. an auth-quota error shape that omits the project path).

Common situations: Express-mode Vertex API key that is invalid/expired, so Google returns a bare credential error without the project path; network egress to aiplatform.googleapis.com blocked; a proxy returns an HTML error page; key valid but the probe response shape changed.

Related errors

• Vertex partner models require a project_id. Add it in provid
• Vertex OAuth/ADC requires a project_id. Add quota_project_id
• ${provider} API key required
• Missing base URL
• NanoBanana status ${r.status}

AI-assisted analysis of decolua/9router@90b52e06ff (2026-08-30). Data as JSON: /api/errors/96cd994385a76c3c. Report an issue: GitHub.