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Key leaks are a matter of when, not if. The security goal is not never leaking; it is containing the damage when a leak happens. Two moves decide that: keep keys inside a boundary you can revoke, and stay ready to rotate.
The risk of a model swap or prompt rewrite is rarely that the new version is worse; it is that nobody measured before shipping. Golden sets, graders, and shadow runs are how you measure.
Four more coding agents, four different configuration surfaces: an environment variable, a model prefix, a GUI provider panel, and a config key. Here is each one, wired to a compatible endpoint.
On a managed network, Codex CLI sign-in failures are usually not about the key. The order to check is trust first, credential storage second, login path third.
Streaming looks like a one-line change and behaves like four production problems: the event model, timeout policy, usage accounting, and what to do when a stream breaks mid-answer.
A 403 from an LLM API is four different problems wearing one status code: region policy, permission scope, policy denial, or an edge block in your own path. Each has a different fix, and none of them is retrying.
Tool calling is easy to demo and hard to keep boring: schemas need to be enforceable, turns need a documented number of calls, and the loop needs a plan for failures. Here is the production view.
Structured outputs promise parseable, schema-conformant JSON, and both major vendors deliver it with real limits: a subset of JSON Schema, refusal edges, and SDK differences. Treat the limits as first-class, or debug them in production.
Logging for LLM integrations is not about volume; it is about a field list that can locate failures, attribute cost, and survive an audit, plus one hard line: secrets and customer content stay out.
Codex CLI credential questions come in three shapes: which login mode you are using, where that credential is stored, and which one is active right now. Each answer changes billing, security, and troubleshooting.
A 429 can mean 'slow down for a moment' or 'you are out of quota until a human acts'. The two look identical in a log until you check one header, and the difference decides whether retrying helps or just burns time.
When several credentials are present at once, which one does Claude Code actually use? The official authentication precedence list answers that, and it explains most 'my key stopped working' reports.
Putting a coding agent into a pipeline is not hard to start and easy to get wrong. Three things decide whether it works: how non-interactive mode is invoked, how credentials get in, and where the permission boundaries sit when nobody is watching.
Caching is not a switch you flip; it is prefix reuse, and only a matching rendered prefix hits. Here is what actually gets reused, the writers that silently break the cache, and how to verify hits in your own usage data.
Status codes are a small vocabulary with a large gap between reading them and acting on them. This guide sorts LLM API errors by layer, separates the retryable from the pointless, and maps where OpenAI and Anthropic disagree on the same problem.
Pointing Cursor at an OpenAI-compatible endpoint comes down to three things that have to match: the endpoint address, a working key, and model IDs that exist on that endpoint. Here is the setup, the error triage, and a five-item verification pass.
Changing a key or switching providers rarely fails because the new value was wrong. It fails because the same credential lives in four places. Here is how to change the right surface in Claude Code, Codex CLI, and CC Switch, verify the change took, and decide what happens to your sessions.
Compatible is not a single switch. This checklist breaks the claim into three layers worth verifying separately, the protocol surface, the feature surface, and the behavior surface, with eight concrete checks you can run against any OpenAI-compatible endpoint.
Model retirements are a recurring operations event. This playbook covers the vocabulary to get right, an inventory workflow, an alias layer, golden-set testing, staged cutover, and a preflight check that makes the next migration uneventful.
Four tools, one key: how to point Codex CLI, Claude Code, CC Switch, and Cursor at a single OpenAI-compatible endpoint, and the three mistakes that break the connection.
Separate application quality from AI-search visibility. Record retrieval, citations, and test conditions before drawing conclusions from model answers.
