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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280import type { ToolDefinition } from "@opencode/ai"import { Tool } from "@opencode/schema/tool"import type { StandardJSONSchemaV1, StandardSchemaV1 } from "@standard-schema/spec"import { Cache, Effect, JsonSchema, Schema, SchemaIssue, SchemaRepresentation } from "effect"import { $ZodType, toJSONSchema } from "zod/v4/core"
const formatEffectIssues = SchemaIssue.makeFormatterStandardSchemaV1()
const jsonSchemas = Effect.runSync( Cache.make<JsonSchema.JsonSchema, Schema.Codec<unknown> | undefined>({ capacity: 100, lookup: (schema) => Effect.try({ try: () => jsonSchema(schema), catch: () => undefined, }).pipe(Effect.orElseSucceed(() => undefined)), }),)
export const definition = (tool: Tool.Info<any, any>): ToolDefinition => ({ type: "tool", name: effectiveName(tool), description: tool.description, inputSchema: inputJsonSchema(tool.input), ...(tool.output === undefined ? {} : { outputSchema: outputJsonSchema(tool.output) }),})
export const execute = (tool: Tool.Info<any, any>, input: unknown, context: Tool.Context) => Effect.gen(function* () { const decoded = yield* decodeInput(tool, input) // Tool implementations declare `Tool.Error` but plugins can fail with anything at // runtime. A foreign typed failure would slip past every `catchTag("Tool.Error")` // downstream and leave its call permanently unsettled, so the declared contract is // enforced here at the untrusted boundary. Declines tunnel through as defects and // interrupts are not errors; neither is touched. const result = yield* tool.execute(decoded, context).pipe( Effect.mapError((error: unknown) => error instanceof Tool.Error ? error : new Tool.Error({ message: error instanceof globalThis.Error ? error.message : String(error), }), ), ) if (tool.output === undefined) { if ("output" in result) return yield* Effect.die("Tool result declared output without an output schema") return { output: undefined, content: normalizeContent(result.content), ...(result.metadata === undefined ? {} : { metadata: result.metadata }), } } if (!("output" in result)) return yield* new Tool.Error({ message: "Tool did not return its declared output" }) const output = yield* encodeOutput(tool.output, result.output) return { output, content: normalizeContent(result.content, output), ...(result.metadata === undefined ? {} : { metadata: result.metadata }), } })
const decodeInput = (tool: Tool.Info<any, any>, value: unknown) => Effect.gen(function* () { const result = yield* validateInput(tool.input, value) if (result.issues) return yield* new Tool.Error({ message: formatInputIssues(effectiveName(tool), result.issues, value) }) return result.value })
const validateInput = ( schema: Tool.ValueSchema<any>, value: unknown,): Effect.Effect<StandardSchemaV1.Result<unknown>> => { if (isStandardSchema(schema)) return validateStandard(schema, value) return Effect.gen(function* () { const codec = Schema.isSchema(schema) ? schema : yield* Cache.get(jsonSchemas, schema) if (codec === undefined) return { value } return yield* Schema.decodeUnknownEffect(codec)(value, { errors: "all" }).pipe( Effect.match({ onFailure: (error) => formatEffectIssues(error.issue), onSuccess: (value) => ({ value }), }), ) })}
const formatInputIssues = (tool: string, issues: ReadonlyArray<StandardSchemaV1.Issue>, value: unknown) => { const details = issues.slice(0, 5).map((issue) => { const path = issue.path?.reduce<string>((path, segment) => { const key = typeof segment === "object" ? segment.key : segment if (typeof key === "number") return `${path}[${key}]` return path === "" ? String(key) : `${path}.${String(key)}` }, "") || "root" return `- ${path}: ${issue.message}` }) if (issues.length > 5) details.push(`- ...and ${issues.length - 5} more ${issues.length === 6 ? "issue" : "issues"}`) return `Invalid arguments for tool "${tool}":\n${details.join("\n")}\n\nArguments provided:\n${JSON.stringify(value, null, 2)}\n\nUpdate the arguments and call the tool again.`}
const jsonSchema = (schema: JsonSchema.JsonSchema) => { const draft = (typeof schema.$schema === "string" && schema.$schema.includes("draft-07")) || "definitions" in schema ? JsonSchema.fromSchemaDraft07(schema) : JsonSchema.fromSchemaDraft2020_12(schema) return Schema.make<Schema.Codec<unknown>>(SchemaRepresentation.fromJsonSchemaDocument(draft).ast)}
const encodeOutput = (schema: Tool.ValueSchema<any>, value: unknown) => { if (Schema.isSchema(schema)) return Schema.encodeEffect(schema)(value).pipe( Effect.mapError( (error) => new Tool.Error({ message: `Tool returned an invalid value for its output schema: ${error.message}` }), ), ) if (isStandardSchema(schema)) return validateStandard(schema, value).pipe( Effect.flatMap((result) => result.issues ? new Tool.Error({ message: `Tool returned an invalid value for its output schema: ${result.issues.map((issue) => issue.message).join(", ")}`, }) : Effect.succeed(result.value), ), ) return Schema.decodeUnknownEffect(Schema.Json)(value).pipe( Effect.mapError( (error) => new Tool.Error({ message: `Tool returned a non-JSON value for its output schema: ${error.message}` }), ), )}
const isStandardSchema = (schema: Tool.ValueSchema<any>): schema is StandardSchemaV1<any, any> => typeof schema === "object" && schema !== null && "~standard" in schema
const isStandardJSONSchema = ( schema: StandardSchemaV1<any, any>,): schema is StandardSchemaV1<any, any> & StandardJSONSchemaV1<any, any> => "jsonSchema" in schema["~standard"]
const validateStandard = ( schema: StandardSchemaV1<any, any>, value: unknown,): Effect.Effect<StandardSchemaV1.Result<unknown>> => Effect.gen(function* () { const result = yield* Effect.try({ try: () => schema["~standard"].validate(value), catch: (error) => error }) return result instanceof Promise ? yield* Effect.tryPromise({ try: () => result, catch: (error) => error }) : result }).pipe( Effect.match({ onFailure: (error) => ({ issues: [{ message: error instanceof Error ? error.message : String(error) }] }), onSuccess: (result) => result, }), )
const inputJsonSchema = (schema: Tool.ValueSchema<any>): JsonSchema.JsonSchema => { if (schema === undefined || schema === null) return {} if (isStandardSchema(schema)) return standardJsonSchema(schema, "input") return Schema.isSchema(schema) ? toJsonSchema(schema) : schema}
const outputJsonSchema = (schema: Tool.ValueSchema<any>): JsonSchema.JsonSchema => { if (isStandardSchema(schema)) return standardJsonSchema(schema, "output") return Schema.isSchema(schema) ? toJsonSchema(schema) : schema}
const standardJsonSchema = (schema: StandardSchemaV1<any, any>, io: "input" | "output"): JsonSchema.JsonSchema => { if (isStandardJSONSchema(schema)) return schema["~standard"].jsonSchema[io]({ target: "draft-2020-12" }) if (schema instanceof $ZodType) return toJSONSchema(schema, { target: "draft-2020-12", io }) throw new Error(`Schema vendor "${schema["~standard"].vendor}" does not support JSON Schema conversion`)}
const toJsonSchema = (schema: Schema.Top): JsonSchema.JsonSchema => { const document = Schema.toJsonSchemaDocument(schema) // Effect emits valid JSON Schema that some inference providers handle poorly. Simplify it // without changing validation: `{ type: "integer", allOf: [{ minimum: 0 }] }` becomes // `{ type: "integer", minimum: 0 }` only when no keyword would be overwritten. Named schemas // emit `$ref` plus root `$defs`; inline acyclic local references so providers receive the full // nested schema directly, then remove unused `$defs`. Recursive references stay intact because // expanding them would never terminate. const normalized = flattenAllOf( Object.keys(document.definitions).length === 0 ? document.schema : { ...document.schema, $defs: document.definitions }, ) return dropDefinitionsIfResolved(inlineLocalReferences(normalized)) as JsonSchema.JsonSchema}
const flattenAllOf = (value: unknown): unknown => { if (Array.isArray(value)) return value.map(flattenAllOf) if (typeof value !== "object" || value === null) return value
const schema = Object.fromEntries(Object.entries(value).map(([key, item]) => [key, flattenAllOf(item)])) if (!Array.isArray(schema.allOf) || !schema.allOf.every(isRecord) || !canFlattenAllOf(schema.allOf, schema)) return schema const { allOf, ...rest } = schema return flattenAllOf({ ...Object.assign({}, ...allOf), ...rest })}
const isRecord = (value: unknown): value is Record<string, unknown> => typeof value === "object" && value !== null && !Array.isArray(value)
const canFlattenAllOf = (allOf: ReadonlyArray<Record<string, unknown>>, parent: Record<string, unknown>) => { const keys = new Set(Object.keys(parent).filter((key) => key !== "allOf")) return allOf.every((item) => Object.keys(item).every((key) => { if (keys.has(key)) return false keys.add(key) return true }), )}
const inlineLocalReferences = ( value: unknown, definitions?: Record<string, unknown>, seen = new Set<string>(),): unknown => { if (Array.isArray(value)) return value.map((item) => inlineLocalReferences(item, definitions, seen)) if (!isRecord(value)) return value
const localDefinitions = definitions ?? (isRecord(value.$defs) ? value.$defs : undefined) if (typeof value.$ref === "string" && localDefinitions) { const segment = value.$ref.match(/^#\/\$defs\/([^/]+)$/)?.[1] const name = segment?.replaceAll("~1", "/").replaceAll("~0", "~") if (name && !seen.has(name)) { const target = localDefinitions[name] if (target) { const { $ref: _, ...rest } = value const resolvedTarget = inlineLocalReferences(target, localDefinitions, new Set(seen).add(name)) const resolvedSiblings = inlineLocalReferences(rest, localDefinitions, seen) if (!isRecord(resolvedTarget) || !isRecord(resolvedSiblings)) return resolvedTarget if (canMergeRecords(resolvedTarget, resolvedSiblings)) return { ...resolvedTarget, ...resolvedSiblings } return { allOf: [resolvedTarget, resolvedSiblings] } } } }
return Object.fromEntries( Object.entries(value).map(([key, item]) => [key, inlineLocalReferences(item, localDefinitions, seen)]), )}
const canMergeRecords = (left: Record<string, unknown>, right: Record<string, unknown>) => Object.keys(left).every((key) => !(key in right))
const dropDefinitionsIfResolved = (value: unknown): unknown => { if (!isRecord(value) || hasLocalReference(value)) return value const { $defs: _, ...rest } = value return rest}
const hasLocalReference = (value: unknown): boolean => { if (Array.isArray(value)) return value.some(hasLocalReference) if (!isRecord(value)) return false if (typeof value.$ref === "string" && value.$ref.startsWith("#/$defs/")) return true return Object.values(value).some(hasLocalReference)}
export const normalizeContent = (value: string | ReadonlyArray<Tool.Content> | undefined, output?: unknown) => { if (typeof value === "string") return [{ type: "text" as const, text: value }] if (value !== undefined && value.length > 0) return [...value] return [{ type: "text" as const, text: stringify(output) }]}
const stringify = (value: unknown) => { if (typeof value === "string") return value try { return JSON.stringify(value) ?? String(value) } catch { return String(value) }}
export const normalizedName = (tool: Tool.Info) => tool.name.replace(/[^a-zA-Z0-9_-]/g, "_")
export const effectiveName = (tool: Tool.Info) => tool.options?.namespace === undefined ? normalizedName(tool) : `${tool.options.namespace.replaceAll(".", "_")}_${normalizedName(tool)}`