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tg-chat-bot/src/ai/tool-ranker-fallback.ts
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TypeScript

import {ToolRankerFallbackPolicy} from "../common/policies.js";
import {decidePipelineFallback, type PipelineFallbackDecision} from "./user-request-pipeline/fallback-executor.js";
export type ToolRankerFallbackSelection = {
toolNames: string[];
usedRanker: boolean;
};
export type ToolRankerFallbackDecision = PipelineFallbackDecision & ToolRankerFallbackSelection;
function fallbackActionForPolicy(policy: ToolRankerFallbackPolicy) {
return policy === ToolRankerFallbackPolicy.MAIN_MODEL
? "use_alternate_target"
: "continue_without_stage";
}
export function decideToolRankerFallback(params: {
fallbackPolicy: ToolRankerFallbackPolicy;
availableToolNames: readonly string[];
reason: "unavailable" | "failed";
}): ToolRankerFallbackDecision {
const action = fallbackActionForPolicy(params.fallbackPolicy);
const decision = decidePipelineFallback({
stage: "tool_rank",
reason: params.reason,
policies: [{
stage: "tool_rank",
onUnavailable: action,
onFailed: action,
}],
});
return {
...decision,
toolNames: params.fallbackPolicy === ToolRankerFallbackPolicy.NO_TOOLS
? []
: [...params.availableToolNames],
usedRanker: false,
};
}
export function resolveToolRankerFallbackSelection(params: {
fallbackPolicy: ToolRankerFallbackPolicy;
availableToolNames: readonly string[];
}): ToolRankerFallbackSelection {
const decision = decideToolRankerFallback({
fallbackPolicy: params.fallbackPolicy,
availableToolNames: params.availableToolNames,
reason: "failed",
});
return {
toolNames: decision.toolNames,
usedRanker: decision.usedRanker,
};
}