Merge pinned master into status bar projection

packages/core/session/src/index.ts

@@ -201,13 +201,18 @@ function assertCurrentLlmShape(event: Record<string, unknown>, index: number): v
     : undefined
   if (event['type'] === 'request/header') {
     const header = record?.['header']
-    const config = typeof header === 'object' && header !== null ? (header as Record<string, unknown>)['config'] : undefined
+    const headerRecord = typeof header === 'object' && header !== null && !Array.isArray(header)
+      ? header as Record<string, unknown>
+      : undefined
+    const config = headerRecord?.['config']
     if (!hasProviderModel(config)) throw new Error(`seed request/header at index ${index} lacks provider/model`)
-    const reasoningEffort = (config as Record<string, unknown>)['reasoningEffort']
+    const configRecord = config as Record<string, unknown>
+    const reasoningEffort = configRecord['reasoningEffort']
     if (reasoningEffort !== undefined
       && (typeof reasoningEffort !== 'string' || reasoningEffort.length === 0)) {
       throw new Error(`seed request/header at index ${index} has an invalid reasoningEffort`)
     }
+    assertAdapterDefaults(headerRecord?.['adapterDefaults'], configRecord, index)
   }
   const type = event['type']
   if (type !== 'user/message' && type !== 'assistant/message'
@@ -215,6 +220,26 @@ function assertCurrentLlmShape(event: Record<string, unknown>, index: number): v
   assertMessageEventShape(event, `seed ${type} at index ${index}`)
 }
 
+/** Validate adapter-default provenance imported from a durable request header. */
+function assertAdapterDefaults(
+  value: unknown,
+  config: Record<string, unknown>,
+  index: number,
+): void {
+  if (value === undefined) return
+  if (typeof value !== 'object' || value === null || Array.isArray(value)) {
+    throw new Error(`seed request/header at index ${index} has invalid adapterDefaults`)
+  }
+  const defaults = value as Record<string, unknown>
+  const allowed = new Set(['reasoningEffort', 'maxTokens'])
+  if (Object.keys(defaults).some(key => !allowed.has(key))
+    || Object.values(defaults).some(marker => marker !== true)
+    || defaults['reasoningEffort'] === true && config['reasoningEffort'] === undefined
+    || defaults['maxTokens'] === true && config['maxTokens'] === undefined) {
+    throw new Error(`seed request/header at index ${index} has invalid adapterDefaults`)
+  }
+}
+
 /** Validate only the event-specific invariants needed to safely replay a message. */
 function assertMessageEventShape(event: Record<string, unknown>, subject: string): void {
   const type = event['type']

packages/core/session/src/request-header.ts

@@ -19,8 +19,12 @@ import type { EpochHeader, SessionEvent } from './types.ts'
  * @returns the canonical header.
  */
 export function canonicalHeader(header: EpochHeader): EpochHeader {
+  const adapterDefaults = header.adapterDefaults
   return {
     config: header.config,
+    ...adapterDefaults?.reasoningEffort === true || adapterDefaults?.maxTokens === true
+      ? { adapterDefaults }
+      : {},
     ...header.system !== undefined && header.system.length > 0 ? { system: header.system } : {},
     ...header.tools !== undefined && header.tools.length > 0 ? { tools: header.tools } : {},
   }
@@ -38,7 +42,12 @@ function sameSchema(a: ToolSchema, b: ToolSchema): boolean {
  * @returns whether config, system, and tools all match.
  */
 export function headerEquals(a: EpochHeader, b: EpochHeader): boolean {
-  if (!callConfigEquals(a.config, b.config) || a.system !== b.system) return false
+  if (
+    !callConfigEquals(a.config, b.config)
+    || a.adapterDefaults?.reasoningEffort !== b.adapterDefaults?.reasoningEffort
+    || a.adapterDefaults?.maxTokens !== b.adapterDefaults?.maxTokens
+    || a.system !== b.system
+  ) return false
   const at = a.tools ?? []
   const bt = b.tools ?? []
   return at.length === bt.length && at.every((tool, i) => sameSchema(tool, bt[i] as ToolSchema))

packages/core/session/src/types.ts

@@ -3,6 +3,7 @@ import type {
   AssistantMessage,
   CallId,
   LlmCallConfig,
+  LlmCallConfigAdapterDefaults,
   LlmFailure,
   MessageSource,
   StreamChunk,
@@ -163,6 +164,8 @@ export interface TodoItem {
 export interface EpochHeader {
   /** The conversation's call configuration (provider, model, reasoning effort, and sampling scalars). */
   config: LlmCallConfig
+  /** Effective config fields materialized from the exact adapter rather than proposed by a caller. */
+  adapterDefaults?: LlmCallConfigAdapterDefaults
   /** Rendered system prompt text; absent for a system-less request. */
   system?: string
   /** Assembled tool schemas; absent for a tool-less request. */