TypeScript SDK: Use generated types for model info and remove duplicates

[sergiou87]

Replace local duplicate model info types (which need to be manually updated) with types from generated files.

I tried this approach since I see the same pattern used for SessionEvent and RemoteSessionMode:

copilot-sdk/nodejs/src/types.ts

Lines 12 to 21 in afbebc7

	import type {
	ReasoningSummary,
	SessionEvent as GeneratedSessionEvent,
	} from "./generated/session-events.js";
	import type { CopilotSession } from "./session.js";
	import type { RemoteSessionMode } from "./generated/rpc.js";
	import type { OpenCanvasInstance } from "./generated/rpc.js";
	import type { ToolSet } from "./toolSet.js";
	export type { RemoteSessionMode } from "./generated/rpc.js";
	export type SessionEvent = GeneratedSessionEvent;

According to Copilot, these are the effective changes in the API if we decided to go ahead with this approach:

Main breaking changes: generated ModelCapabilities makes supports, limits, and several nested fields optional; generated ModelPolicy makes terms optional; generated Model widens reasoning effort fields from ReasoningEffort to string.

ModelInfo

Now exported as generated Model aliased to ModelInfo.

Attribute name	Before	After	Comment
Type declaration	interface ModelInfo	Model re-exported as ModelInfo	Structural API preserved, but symbol kind/name changed. Potentially breaking for declaration merging or tools expecting an interface literally named ModelInfo.
id	string	string	No change.
name	string	string	No change.
capabilities	ModelCapabilities	ModelCapabilities	Same top-level name, but nested shape changed. See ModelCapabilities.
policy	ModelPolicy | undefined	ModelPolicy | undefined	Same optional field, but ModelPolicy.terms changed.
billing	ModelBilling | undefined	ModelBilling | undefined	Same optional field, but ModelBilling now has optional tokenPrices.
supportedReasoningEfforts	ReasoningEffort[] | undefined	string[] | undefined	Breaking/type precision loss for consumers reading this as ReasoningEffort[]; now must validate or narrow strings manually.
defaultReasoningEffort	ReasoningEffort | undefined	string | undefined	Breaking/type precision loss for consumers assigning directly to ReasoningEffort.
modelPickerCategory	Not present	ModelPickerCategory | undefined	Additive optional generated field.
modelPickerPriceCategory	Not present	ModelPickerPriceCategory | undefined	Additive optional generated field.

ModelCapabilities

Attribute name	Before	After	Comment
supports	{ vision: boolean; reasoningEffort: boolean }	ModelCapabilitiesSupports | undefined	Breaking for readers: capabilities.supports can now be absent. More permissive for providers.
supports.vision	boolean	boolean | undefined	Breaking for readers: guard/default needed.
supports.reasoningEffort	boolean	boolean | undefined	Breaking for readers: guard/default needed.
limits	{ max_prompt_tokens?: number; max_context_window_tokens: number; vision?: ... }	ModelCapabilitiesLimits | undefined	Breaking for readers: capabilities.limits can now be absent.
limits.max_prompt_tokens	number | undefined	number | undefined	Same field optionality, ignoring optional parent.
limits.max_context_window_tokens	number	number | undefined	Breaking for readers: previously guaranteed.
limits.max_output_tokens	Not present	number | undefined	Additive optional generated field.
limits.vision	Vision limits object or undefined	ModelCapabilitiesLimitsVision | undefined	Same optional field, now named generated type.
limits.vision.supported_media_types	string[]	string[]	No change once vision exists.
limits.vision.max_prompt_images	number	number	No change once vision exists.
limits.vision.max_prompt_image_size	number	number	No change once vision exists.

ModelPolicy

Attribute name	Before	After	Comment
state	"enabled" | "disabled" | "unconfigured"	ModelPolicyState	Same union values, now named generated alias.
terms	string	string | undefined	Breaking for readers: callers can no longer assume terms exists. More permissive for model providers.

ModelBilling

Attribute name	Before	After	Comment
multiplier	number | undefined	number | undefined	No change.
tokenPrices	Not present	ModelBillingTokenPrices | undefined	Additive optional generated field. Previously excess property for object literals typed as ModelBilling; now accepted.

ModelBillingTokenPrices

New generated nested type reachable through ModelBilling.tokenPrices.

Attribute name	Before	After	Comment
inputPrice	Not present	number | undefined	Additive optional field.
outputPrice	Not present	number | undefined	Additive optional field.
cachePrice	Not present	number | undefined	Additive optional field.
batchSize	Not present	number | undefined	Additive optional field.
contextMax	Not present	number | undefined	Additive optional field.
longContext	Not present	ModelBillingTokenPricesLongContext | undefined	Additive optional nested field.

ModelBillingTokenPricesLongContext

New generated nested type reachable through ModelBilling.tokenPrices.longContext.

Attribute name	Before	After	Comment
inputPrice	Not present	number | undefined	Additive optional field.
outputPrice	Not present	number | undefined	Additive optional field.
cachePrice	Not present	number | undefined	Additive optional field.
contextMax	Not present	number | undefined	Additive optional field.

ModelCapabilitiesOverride

Not removed, but its expansion changes because it is still DeepPartial<ModelCapabilities> and ModelCapabilities now comes from generated RPC types.

Attribute name	Before	After	Comment
supports.vision	boolean | undefined	boolean | undefined	No effective change.
supports.reasoningEffort	boolean | undefined	boolean | undefined	No effective change.
limits.max_prompt_tokens	number | undefined	number | undefined	No effective change.
limits.max_context_window_tokens	number | undefined	number | undefined	No effective change because old type was already deep-partial.
limits.max_output_tokens	Not present	number | undefined	Additive optional override.
limits.vision.supported_media_types	string[] | undefined	string[] | undefined	No effective change.
limits.vision.max_prompt_images	number | undefined	number | undefined	No effective change.
limits.vision.max_prompt_image_size	number | undefined	number | undefined	No effective change.