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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteSometimes. If a requested option is incompatible with the selected model but the client can still work, a constructor can return that usable client alongside a report identifying what it could not apply. If an essential prerequisite such as credentials is missing, construction should fail and return no client. Matt Cockayne argues for this distinction in a design essay published September 17, 2026; it is a proposal and implementation account, not a universal Go convention.
Why return a client when configuration has a problem?
A conventional Go constructor often returns a value and an error: (T, error). In that shape, callers generally treat a non-nil error as a reason not to use the returned value. Cockayne’s argument is that a chat client can be assembled from many choices—provider, model, credentials, endpoint, timeout, sampling options, streaming, tools, and fallback behavior—and that some of those choices can fail independently.
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For example, a caller may request a temperature setting for a model that does not support temperature. That option cannot be honored, but the selected provider, model, credentials, and other configuration might still be enough to make a useful client. Rejecting everything can discard that useful portion; silently ignoring the option can make the client behave differently from what the caller asked for.
Cockayne proposes returning the best usable client the constructor can build, together with a “receipt” describing settings that were dropped. The policy is a tradeoff, not a rule that every Go client should adopt.
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What belongs in the construction report?
The report should make each incompatibility actionable rather than merely signaling that something went wrong. Cockayne’s proposed fields are:
Fields: which configuration field or fields could not be applied.Capability: the capability required by those fields.Reason: why the setting could not be applied.
For a temperature request on a model without temperature support, a useful report would identify the temperature field, the required temperature capability, and the incompatibility. That lets the caller decide whether to accept the resulting client, change the model, or revise the requested configuration.
The constructor should collect every issue it discovers rather than stop at the first one, and preserve error unwrapping so callers can inspect underlying causes. Cockayne describes the aim this way: “Construction reports every problem rather than the first, so a caller fixing three mistakes learns all three from one call instead of one round-trip at a time.” The “three mistakes” are an illustrative example, not a measured outcome.
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Which problems are recoverable, and which are fatal?
The key decision is whether a meaningful client can still operate without the setting. An unsupported optional setting can be reported as a degradation while returning the client. A missing essential prerequisite is different: without credentials, the client cannot be meaningfully constructed.
| Situation | Construction result | Reason |
|---|---|---|
| Requested temperature is unsupported by the selected model | Return the usable client and report the dropped setting | The option is incompatible, but the client may still function without it |
| Credentials are missing | Return no client and report ErrUnableToConstruct |
An essential prerequisite is absent |
This boundary prevents “best effort” from becoming a blanket excuse to return a client that cannot do useful work. It also makes clear that not every configuration error should be downgraded to a warning.
What does the caller need to do?
Returning a client with a report moves an important decision to the caller: inspect the report and decide whether partial configuration is acceptable. If the caller ignores the report, the client may run with behavior that differs from the requested configuration. The proposal does not guarantee correct behavior when diagnostics are discarded.
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That responsibility is central to the API choice. A library that treats every issue as fatal enforces strict configuration at construction time. A library that returns a client plus diagnostics preserves usable configuration but requires callers to handle the report deliberately.
What did the implementation account reveal?
Cockayne describes an early error-reporting omission: when the caller had not selected a model, a dropped-setting error did not name the default model. He says a fix addressed it. He also recalls that the omission remained for “about twelve hours”; that is an anecdote about the implementation, not evidence about how often such bugs occur or how the design performs generally.
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