File size: 2,997 Bytes
eb1202c | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 | import { Effect } from "effect"
import {
LLMEvent,
type ToolCallPart,
ToolFailure,
ToolOutput,
ToolResultValue,
type ToolOutput as ToolOutputType,
type ToolResultValue as ToolResultValueType,
} from "./schema"
import { type AnyTool, type Tools } from "./tool"
export interface ToolSettlement {
readonly result: ToolResultValueType
readonly output?: ToolOutputType
}
export interface DispatchResult extends ToolSettlement {
readonly events: ReadonlyArray<LLMEvent>
}
/** Execute one canonical tool call without owning provider IO or continuation. */
export const dispatch = (tools: Tools, call: ToolCallPart): Effect.Effect<DispatchResult> => {
const tool = tools[call.name]
if (!tool) return Effect.succeed(result(call, { type: "error", value: `Unknown tool: ${call.name}` }))
if (!tool.execute)
return Effect.succeed(result(call, { type: "error", value: `Tool has no execute handler: ${call.name}` }))
return decodeAndExecute(tool, call).pipe(
Effect.map((value) => result(call, value)),
Effect.catchTag("LLM.ToolFailure", (failure) =>
Effect.succeed(result(call, { type: "error", value: failure.message }, failure.error)),
),
)
}
const decodeAndExecute = (tool: AnyTool, call: ToolCallPart): Effect.Effect<ToolSettlement, ToolFailure> =>
tool._decode(call.input).pipe(
Effect.mapError((error) => new ToolFailure({ message: `Invalid tool input: ${error.message}` })),
Effect.flatMap((decoded) =>
tool.execute!(decoded, { id: call.id, name: call.name }).pipe(
Effect.flatMap((value) =>
tool._encode(value).pipe(
Effect.mapError(
(error) =>
new ToolFailure({
message: `Tool returned an invalid value for its success schema: ${error.message}`,
}),
),
),
),
Effect.map((encoded) => {
if (tool._legacyResult && ToolResultValue.is(encoded))
return { result: encoded, output: ToolOutput.fromResultValue(encoded) }
const output = tool._project(decoded, call.id, encoded)
const result = ToolOutput.toResultValue(output)
return result.type === "error" ? { result } : { result, output }
}),
),
),
)
const result = (call: ToolCallPart, value: ToolResultValueType | ToolSettlement, error?: unknown): DispatchResult => {
const settlement = ToolResultValue.is(value) ? { result: value } : value
return {
result: settlement.result,
output: settlement.output,
events:
settlement.result.type === "error"
? [
LLMEvent.toolError({ id: call.id, name: call.name, message: String(settlement.result.value), error }),
LLMEvent.toolResult({ id: call.id, name: call.name, result: settlement.result }),
]
: [LLMEvent.toolResult({ id: call.id, name: call.name, result: settlement.result, output: settlement.output })],
}
}
export const ToolRuntime = { dispatch } as const
|