refactor(core): migrate MessageV2 part leaves + ToolPart to Effect Schema#23756
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kitlangton merged 1 commit intodevfrom Apr 22, 2026
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refactor(core): migrate MessageV2 part leaves + ToolPart to Effect Schema#23756kitlangton merged 1 commit intodevfrom
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Migrates all 13 part leaf schemas and the FilePartSource union to Effect Schema with derived .zod compatibility. ToolPart also moves, now referencing ToolState directly via Schema.Struct. The Part discriminated union stays Zod in this slice (migrates next). Also exports Schema-backed {Text,File,Agent,Subtask}PartInput with matching identifiers so prompt.ts PromptInput can reference them via .zod without re-inlining the part shapes. CommandInput keeps its (smaller) FilePart shape inlined since the SDK does not name that one with a $ref.
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Summary
Third piecemeal slice of the session-domain Effect Schema migration.
.zodcompatibility:SnapshotPart,PatchPart,TextPart,ReasoningPart,FileSource,SymbolSource,ResourceSource,FilePartSource,FilePart,AgentPart,CompactionPart,SubtaskPart,RetryPart,StepStartPart,StepFinishPart,ToolPart.ToolPartnow referencesToolStatedirectly viaSchema.Struct.ToolStateCompleted.attachmentsdrops theZodOverridebridge and usesSchema.Array(FilePart)directly.RetryPart.errorbridges toAPIError.SchemaviaZodOverridesince the error classes are stillNamedError-based Zod.*PartInputschemas inprompt.tssoz.discriminatedUnionkeeps its precise shape inference (the original.omit/.partialhelpers only existed on the raw Zod types).Acceptance check
bun typecheck(package + repo root) clean.bun run test→ 2010 pass / 0 fail.bun dev generatebyte-identical to committedpackages/sdk/openapi.json.packages/sdk/js/src/v2/gen/types.gen.tsunchanged afterbun script/build.ts.Follow-up
Part of the stacked session-schema migration series. The next slice (stacked PR) migrates the message aggregate DTOs (
User,Assistant,Partunion,Info,WithParts).