Per-session model override (web + SDK) - #500
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Add an optional `model` on session create so a session can run a model other than its agent's. Web "Start session" dialog gets an optional Model field (placeholder = the agent's model; hidden for flue agents, whose model is pinned in the artifact); web client + TS SDK CreateSessionParams thread `model?` through; docs note the override on POST /v3/sessions. SDK 0.11.2 -> 0.12.0 (version-gated publish, lockstep). Pairs with the sessions-api core enforcement (parallel PR). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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- sessions.mdx: a dedicated ## Model section (what it does, optional/ inherit, precedence, pinned-for-life, flue-rejected) + SDK & REST example. - api-reference.mdx: model? entry in the create-params list (422 for flue). - runtimes.mdx: per-session override note at the model-validation line (same prefix rule; unknown model still fails at first turn; not flue). - flue.mdx: model-triangle row states a session can't override flue's model. - agents.mdx: cross-ref from the snapshot-freeze note. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Model-validation failures throw AgentValidationError -> 400 type:"invalid" (same as provider-mismatch); 422 is reserved for managed_unavailable. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Adds an optional
modelto session create so a session can run a model other than its agent's default. This is the web + SDK half; the sessions-api core (accepting/validating/applyingmodelat create) is a parallel PR.Wire contract
POST /v3/sessionsaccepts an optionalmodel?: string. Omitted → inherit the agent's model. Present → the session runs that model. Sameprovider/modelform as the agent's model; must resolve to the agent's runtime's provider. Not for flue (model is pinned in the deployed artifact).Changes
sdks/typescript/src/agents/sessions.ts—model?onCreateSessionParams(type-only;create()already forwards the body verbatim). Version 0.11.2 → 0.12.0 + lockfile (version-gated publish, lockstep rule).web/src/api/client.ts—model?on thecreateSessionbody, passed through.web/src/pages/Sessions.tsx— optional Model field in the Start-session dialog. Empty by default (inherits); placeholder shows the selected agent's model; only sent when non-empty; hidden for flue agents; cleared when the agent changes (a model is runtime-specific).docs/agent-sessions/sessions.mdx— themodeloverride noted on the create flow.Gates
tsc --noEmit✅ +tscbuild ✅npm run typecheck✅ +npm run build✅Notes
web/src/pages/Sessions.tsx+web/src/api/client.ts— independent features, based onmain, reconcile at merge (both add small, non-conflicting hunks: web (W11): sessions dashboard — runtime + spend, richer viewer, submission-health panel #498 adds columns/cells + a body_truncated schema; this adds a dialog field + a bodymodel?).🤖 Generated with Claude Code