Cursor / Cursor

Cursor API Invalid Request — messages Field Required

Fix Cursor IDE API invalid request error when messages field is undefined Includes evidence for Cursor troubleshooting demand.

Source-backed Last updated May 13, 2026 1 source Needs local verification

Category: Cursor
Error signature: Invalid request: [{"code":"invalid_type","expected":"array","received":"undefined","path":["messages"],"message":"Required"}]
Quick fix: Compare the failing environment with a known working setup, then change one configuration value at a time.
Updated: May 13, 2026
Verification status: Source-backed
Evidence: 1 public source URL

Before you change production

This page includes public source URLs in the imported troubleshooting record. Compare those references with your version and environment before applying changes.

Reproduce the smallest failing action and save non-secret logs before changing configuration.
Check versions for Cursor, related SDKs, package managers, CI runners, and hosting providers.
Change one setting or dependency at a time, then rerun the same failing command or request.
Avoid destructive commands, credential rotation, billing changes, or security relaxations without a rollback plan.

What this error means

Invalid request: [{"code":"invalid_type","expected":"array","received":"undefined","path":["messages"],"message":"Required"}] is a Cursor failure pattern reported for developers trying to fix cursor ide api invalid request error when messages field is undefined. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

Real error log from Cursor IDE showing Zod validation failure when messages array is undefined in API request. Affects developers using proxy setups with Cursor.

Common causes

Developers integrating Cursor with custom API proxies or custom LLM backends encounter this validation error when the proxy fails to properly forward the messages array. The Zod validation error is technical and unhelpful for IDE users.
Real error log from Cursor IDE showing Zod validation failure when messages array is undefined in API request. Affects developers using proxy setups with Cursor.

Quick fixes

Confirm the exact error signature matches Invalid request: [{"code":"invalid_type","expected":"array","received":"undefined","path":["messages"],"message":"Required"}].
Check the Cursor account, local tool state, and provider configuration involved in the failing workflow.
Compare the failing environment with a known working setup, then change one configuration value at a time.

Platform/tool-specific checks

Verify the command, editor, extension, or API client that produced the error.
Compare local settings with CI, deployment, or editor-level settings when the error appears in only one environment.
Avoid deleting credentials, local model data, or project settings until the failing scope is clear.

Step-by-step troubleshooting

Capture the exact error message and the command, editor action, or request that triggered it.
Check whether the failure is account/auth, quota/rate, model/provider, local runtime, or deployment configuration.
Review the source evidence below and compare it with your environment.
Apply one change at a time and rerun the smallest failing action.
Keep the working fix documented for the team or deployment environment.

How to prevent it

Keep provider/tool configuration documented.
Record non-secret diagnostics such as tool version, provider name, model name, and command path.
Add a lightweight check before CI or production workflows depend on the tool.

Diagnostic flow for this page

Match Invalid request: [{"code":"invalid_type","expected":"array","received":"undefined","path":["messages"],"message":"Required"}] exactly before applying the quick fix.
Compare the failing environment with Cursor versions, account scope, provider settings, and deployment context.
Check the listed common causes in order, starting with the cause that best matches your logs.
Use the evidence status below to decide whether to confirm against public sources or official documentation.
Apply one reversible change, rerun the smallest failing action, and keep rollback notes.

FAQ

What does Invalid request: [{"code":"invalid_type","expected":"array","received":"undefined","path":["messages"],"message":"Required"}] mean in Cursor?

Invalid request: [{"code":"invalid_type","expected":"array","received":"undefined","path":["messages"],"message":"Required"}] indicates the workflow described by "Cursor API Invalid Request — messages Field Required" failed in a Cursor context. Start by confirming the exact signature and the component that emitted it.

What should I check first for Invalid request: [{"code":"invalid_type","expected":"array","received":"undefined","path":["messages"],"message":"Required"}]?

Check whether this cause matches your environment: Developers integrating Cursor with custom API proxies or custom LLM backends encounter this validation error when the proxy fails to properly forward the messages array. The Zod validation error is technical and unhelpful for IDE users.

Is the Invalid request: [{"code":"invalid_type","expected":"array","received":"undefined","path":["messages"],"message":"Required"}] guidance source-backed?

The "Cursor API Invalid Request — messages Field Required" page is labeled source-backed. It has 1 public source URL from github.com, so use that evidence status when deciding how much additional verification you need.

When should I avoid the quick fix for Invalid request: [{"code":"invalid_type","expected":"array","received":"undefined","path":["messages"],"message":"Required"}]?

For "Cursor API Invalid Request — messages Field Required", avoid applying "Compare the failing environment with a known working setup, then change one configuration value at a time." when the error text differs, the affected version or provider is different, or the change would touch credentials, billing, DNS, production deploy settings, or irreversible data.

What should I collect before debugging Invalid request: [{"code":"invalid_type","expected":"array","received":"undefined","path":["messages"],"message":"Required"}]?

For "Cursor API Invalid Request — messages Field Required", collect the failing Cursor command or request, non-secret configuration, versions, timestamps, request IDs when available, and the smallest reproduction that still triggers the signature.