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Cursor

Override the OpenAI endpoint for chat; Tab still uses Cursor’s models.

LimitedOpenAI Chat CompletionsDocs checked 2026-09-18

Configuration is available with version, account, region or feature restrictions. Read the conditions below first.

On this page

Before you begin

Install current Cursor and complete account setup. A custom key does not replace product access; plans and team policy can impose other limits.

Have an A2Agent API key ready and copy an accessible model ID from the catalog. Replace every placeholder, back up existing settings and keep keys out of repositories.

Manage API keys Browse models

Setup

File contents are usually shared; switching OS changes commands and paths. For WSL on Windows, select macOS / Linux.

01Open model settings
In Cursor Settings → Models → API Keys, enter the OpenAI API key and enable Override OpenAI Base URL.
Open official documentation
02Enter the endpoint and model
Save the URL, add the model ID from the catalog, then select it in chat. If your version has no URL override, changing only the key is insufficient.
text
```
Base URL: https://a2agent.me/v1
API Key: YOUR_A2AGENT_API_KEY
Model ID: YOUR_MODEL_ID
```

Capabilities and limits

Requests pass through Cursor’s servers, so the endpoint must be publicly reachable.
The override can affect other OpenAI models. Disable it when returning to Cursor-managed models; some requests may use Responses.

Verify the connection

Replace every placeholder and run locally. Expect JSON containing OK. Then start a new client conversation, test one read-only tool call separately, and confirm the requests in A2Agent usage records. This test incurs a small amount of model usage.

Shell

curl --fail-with-body --silent --show-error --max-time 60 'https://a2agent.me/v1/chat/completions' \
  -H 'Content-Type: application/json' \
  -H 'Authorization: Bearer YOUR_A2AGENT_API_KEY' \
  -d '{"model":"YOUR_MODEL_ID","max_tokens":128,"messages":[{"role":"user","content":"Reply with OK."}]}'

Troubleshooting

For failed verification, check public HTTPS access, model ID and the protocol actually sent by the client. Tab behavior does not verify this setup.

401 / 403: authentication or access denied

Use a key issued by A2Agent, without extra spaces, and check that it is active and unexpired. Confirm the group permits the model and protocol. A vendor subscription credential cannot replace an A2Agent key.

404 / model not found: endpoint or model mismatch

Check the root URL, /v1 prefix and full request path against this guide; avoid duplicated paths. Model IDs are case-sensitive and must be accessible to the current key.

429: quota or rate limit

Check your balance, key limits, concurrent usage and service status. Wait before retrying and reduce simultaneous agents; repeated retries do not remove a quota limit.

Chat works, but tools fail or streaming stops

Test a short text request, then a single read-file tool call. Check tool support, output budget, proxy timeouts and client version. Inspect the diff before resuming a long task to avoid repeating actions.

Restore previous settings

Disable Override OpenAI Base URL, remove the added key and custom model, then select the previous Cursor model.

Sources and check date

Status is based on official configuration docs, not end-to-end client testing with A2Agent.

Docs checked 2026-09-18