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feat(config): support object-style fallback_models with per-model settings

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Add support for object-style entries in fallback_models arrays, enabling
per-model configuration of variant, reasoningEffort, temperature, top_p,
maxTokens, and thinking settings.

- Zod schema for FallbackModelObject with full validation
- normalizeFallbackModels() and flattenToFallbackModelStrings() utilities
- Provider-agnostic model resolution pipeline with fallback chain
- Session prompt params state management
- Fallback chain construction with prefix-match lookup
- Integration across delegate-task, background-agent, and plugin layers
This commit is contained in:
Ravi Tharuma
2026-03-18 14:21:27 +01:00
parent 7761e48dca
commit a77a16c494
34 changed files with 1686 additions and 126 deletions
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src/plugin/event.ts
+6 -4
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@@ -16,7 +16,7 @@ import {
setSessionFallbackChain,
setPendingModelFallback,
} from "../hooks/model-fallback/hook";
import { getFallbackModelsForSession } from "../hooks/runtime-fallback/fallback-models";
import { getRawFallbackModels } from "../hooks/runtime-fallback/fallback-models";
import { resetMessageCursor } from "../shared";
import { getAgentConfigKey } from "../shared/agent-display-names";
import { readConnectedProvidersCache } from "../shared/connected-providers-cache";
@@ -25,6 +25,7 @@ import { shouldRetryError } from "../shared/model-error-classifier";
import { buildFallbackChainFromModels } from "../shared/fallback-chain-from-models";
import { extractRetryAttempt, normalizeRetryStatusMessage } from "../shared/retry-status-utils";
import { clearSessionModel, getSessionModel, setSessionModel } from "../shared/session-model-state";
import { clearSessionPromptParams } from "../shared/session-prompt-params-state";
import { deleteSessionTools } from "../shared/session-tools-store";
import { lspManager } from "../tools";
@@ -110,10 +111,10 @@ function applyUserConfiguredFallbackChain(
pluginConfig: OhMyOpenCodeConfig,
): void {
const agentKey = getAgentConfigKey(agentName);
const configuredFallbackModels = getFallbackModelsForSession(sessionID, agentKey, pluginConfig);
if (configuredFallbackModels.length === 0) return;
const rawFallbackModels = getRawFallbackModels(sessionID, agentKey, pluginConfig);
if (!rawFallbackModels || rawFallbackModels.length === 0) return;
const fallbackChain = buildFallbackChainFromModels(configuredFallbackModels, currentProviderID);
const fallbackChain = buildFallbackChainFromModels(rawFallbackModels, currentProviderID);
if (fallbackChain && fallbackChain.length > 0) {
setSessionFallbackChain(sessionID, fallbackChain);
@@ -330,6 +331,7 @@ export function createEventHandler(args: {
resetMessageCursor(sessionInfo.id);
firstMessageVariantGate.clear(sessionInfo.id);
clearSessionModel(sessionInfo.id);
clearSessionPromptParams(sessionInfo.id);
syncSubagentSessions.delete(sessionInfo.id);
if (wasSyncSubagentSession) {
subagentSessions.delete(sessionInfo.id);