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feat(llm): interrogate a draft provider endpoint for its models

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Once a pi-ai route became a declaration rather than a catalog lookup,
adding an OpenAI-compatible gateway meant knowing its model ids up
front. Most such endpoints publish that list at `GET /models`, but no
seam operation could ask: every one is keyed by a registered provider
route, and the provider being added has no route, no stored profile,
and no stored credential — the endpoint and key are values in a form.

Interrogation is therefore keyed by settings namespace, which a
configuration surface already holds from the configurable-provider
directory. `registerModelDiscovery` offers it per namespace,
`discoverModels` asks, and the request carries the draft itself. The
reply is candidates, not a catalog: every field but the id is optional
because most listings disclose nothing else, and adopting one is a
settings write like any other. Nothing here reads or writes settings or
credentials, so `settings.yaml` still decides what a route serves.

`llm.discoverModels` carries the same draft over the wire. Its apiKey is
the third and last payload a secret may ride, and it is never stored,
logged, or echoed; every refusal folds into `model-discovery-failed`,
naming the endpoint asked but never the credential offered.

The pi-ai side is a plain GET for OpenAI-compatible protocols only —
their listing shape is the one gateways, self-hosted servers, and the
official endpoints agree on. Others say so, sending the user to
hand-entry rather than reporting a guessed shape as an empty provider.
The reply is read under a four-megabyte ceiling held on the bytes
actually received, because the endpoint is a URL the user typed.
This commit is contained in:
Yichen Jiang
2026-08-04 10:14:46 +08:00
parent 9948a37cbc
commit ecee93ec26
34 changed files with 985 additions and 18 deletions
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3
packages/host/apiproxy/src/fetch/handler.ts
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@@ -57,7 +57,7 @@ import {
import {
credentialsDescribeRequestSchema, credentialsSetRequestSchema, credentialsUnsetRequestSchema,
} from '../api/credentials.schema.ts'
import { llmModelsRequestSchema, llmProvidersRequestSchema } from '../api/llm.schema.ts'
import { llmDiscoverModelsRequestSchema, llmModelsRequestSchema, llmProvidersRequestSchema } from '../api/llm.schema.ts'
import {
subagentHistoryRequestSchema,
subagentListRequestSchema,
@@ -125,6 +125,7 @@ const UNARY_ROUTES: UnaryRoutes = {
'credentials.unset': { schema: credentialsUnsetRequestSchema, invoke: (api, r) => api.credentials.unset(r) },
'llm.providers': { schema: llmProvidersRequestSchema, invoke: (api, r) => api.llm.providers(r) },
'llm.models': { schema: llmModelsRequestSchema, invoke: (api, r) => api.llm.models(r) },
'llm.discoverModels': { schema: llmDiscoverModelsRequestSchema, invoke: (api, r, signal) => api.llm.discoverModels(r, signal) },
}
/** Route lookup that narrows an arbitrary path segment to a map key (single cast point for the string→key refinement). */