fix(core): harden unified tool runtime

packages/core/src/public/index.ts

@@ -3,7 +3,7 @@ export { Agent } from "./agent"
 export { Model } from "./model"
 export { OpenCode } from "./opencode"
 export { Session } from "./session"
-export * as Tool from "./tool"
+export { Tool } from "./tool"
 export { Location } from "./location"
 export { Prompt } from "../session/prompt"
 export { AbsolutePath } from "../schema"

packages/core/src/public/tool.ts

@@ -4,7 +4,7 @@ import { Effect, Scope } from "effect"
 import type { AnyTool, RegistrationError } from "../tool/tool"
 
 export { Failure, RegistrationError, make } from "../tool/tool"
-export type { AnyTool, Content, Context } from "../tool/tool"
+export type { AnyTool, Content, Context, Definition } from "../tool/tool"
 
 export interface Interface {
   /**

packages/core/src/session/runner/llm.ts

@@ -320,6 +320,11 @@ export const layer = Layer.effect(
             yield* FiberSet.clear(toolFibers)
             yield* withPublication(publisher.failUnsettledTools("Tool execution interrupted"))
           }
+          if (settled._tag === "Failure" && !Cause.hasInterrupts(settled.cause)) {
+            const failure = Cause.squash(settled.cause)
+            const message = failure instanceof Error ? failure.message : String(failure)
+            yield* withPublication(publisher.failUnsettledTools(`Tool execution failed: ${message}`))
+          }
           if (publisher.hasProviderError())
             yield* withPublication(publisher.failUnsettledTools("Tool execution interrupted"))
           if (stream._tag === "Success" && !publisher.hasProviderError())

packages/core/src/state.ts

@@ -61,30 +61,40 @@ export function create<State extends Objectish, Editor>(options: Options<State,
     state = next
   })
 
-  const rebuild = Effect.fn("State.rebuild")(function* () {
+  const rebuild = Effect.fnUntraced(function* () {
     const next = options.initial()
     const api = options.editor(next as Draft<State>)
     for (const transform of transforms)
       yield* Effect.sync(() => transform.update(api)).pipe(Effect.withSpan("State.rebuild.update", {}))
     yield* commit(next)
-  }, semaphore.withPermit)
+  })
 
   return {
     get: () => state,
     transform: Effect.fn("State.transform")(function* () {
-      const transform = { update: (_editor: Editor) => {} }
-      transforms = [...transforms, transform]
       const scope = yield* Scope.Scope
-      yield* Scope.addFinalizer(
-        scope,
-        Effect.sync(() => {
-          transforms = transforms.filter((item) => item !== transform)
-        }).pipe(Effect.andThen(rebuild())),
+      return yield* Effect.uninterruptible(
+        Effect.gen(function* () {
+          const transform = { update: (_editor: Editor) => {} }
+          transforms = [...transforms, transform]
+          yield* Scope.addFinalizer(
+            scope,
+            semaphore.withPermit(
+              Effect.sync(() => {
+                transforms = transforms.filter((item) => item !== transform)
+              }).pipe(Effect.andThen(rebuild())),
+            ),
+          )
+          return (update: Transform<Editor>) =>
+            Effect.uninterruptible(
+              semaphore.withPermit(
+                Effect.sync(() => {
+                  transform.update = update
+                }).pipe(Effect.andThen(rebuild())),
+              ),
+            )
+        }),
       )
-      return Effect.fnUntraced(function* (update: Transform<Editor>) {
-        transform.update = update
-        yield* rebuild()
-      })
     }),
     update: Effect.fn("State.update")(function* (update, reason) {
       const api = options.editor(state as Draft<State>)

packages/core/src/tool-output-store.ts

@@ -11,7 +11,6 @@ import type { ToolOutput } from "@opencode-ai/llm"
 
 export const MAX_LINES = 2_000
 export const MAX_BYTES = 50 * 1024
-export const MAX_INLINE_MEDIA_BYTES = 5 * 1024 * 1024
 export const RETENTION = Duration.days(7)
 
 export const MANAGED_DIRECTORY = "tool-output"
@@ -32,13 +31,7 @@ export class StorageError extends Schema.TaggedErrorClass<StorageError>()("ToolO
   cause: Schema.Defect,
 }) {}
 
-export class MediaLimitError extends Schema.TaggedErrorClass<MediaLimitError>()("ToolOutputStore.MediaLimitError", {
-  mime: Schema.String,
-  bytes: Schema.Int,
-  limit: Schema.Int,
-}) {}
-
-export type Error = StorageError | MediaLimitError
+export type Error = StorageError
 
 export interface Interface {
   readonly limits: () => Effect.Effect<{ readonly maxLines: number; readonly maxBytes: number }>
@@ -139,37 +132,33 @@ export const layer = Layer.effect(
     const bound = Effect.fn("ToolOutputStore.bound")(function* (input: BoundInput) {
       const outputLimits = yield* limits()
       const media = input.output.content.filter((item) => item.type === "file")
-      let mediaBytes = 0
-      for (const item of media) {
-        if (item.source.type !== "data") continue
-        mediaBytes += Buffer.byteLength(item.source.data, "utf-8")
-        if (mediaBytes > MAX_INLINE_MEDIA_BYTES)
-          return yield* new MediaLimitError({ mime: item.mime, bytes: mediaBytes, limit: MAX_INLINE_MEDIA_BYTES })
-      }
-      const contextual = {
-        structured: media.length > 0 ? {} : input.output.structured,
-        content: input.output.content.filter((item) => item.type === "text"),
-      }
-      const encoded = yield* Effect.try({
-        try: () => JSON.stringify(contextual, null, 2),
-        catch: (cause) => new StorageError({ operation: "encode", cause }),
-      })
-      if (lineCount(encoded) <= outputLimits.maxLines && Buffer.byteLength(encoded, "utf-8") <= outputLimits.maxBytes)
+      const text = input.output.content.filter((item) => item.type === "text")
+      const contextual =
+        input.output.content.length === 0
+          ? yield* Effect.try({
+              try: () => JSON.stringify(input.output.structured, null, 2) ?? String(input.output.structured),
+              catch: (cause) => new StorageError({ operation: "encode", cause }),
+            })
+          : text.map((item) => item.text).join("")
+      if (
+        lineCount(contextual) <= outputLimits.maxLines &&
+        Buffer.byteLength(contextual, "utf-8") <= outputLimits.maxBytes
+      )
         return {
-          output: { structured: contextual.structured, content: input.output.content },
+          output: input.output,
           outputPaths: [],
         }
 
-      const outputPath = yield* write(encoded)
+      const outputPath = yield* write(contextual)
       const marker = `... output truncated; full content saved to ${outputPath} ...`
 
       return {
         output: {
-          structured: {},
+          structured: input.output.structured,
           content: [
             {
               type: "text" as const,
-              text: boundedPreview(encoded, marker, outputLimits.maxLines, outputLimits.maxBytes),
+              text: boundedPreview(contextual, marker, outputLimits.maxLines, outputLimits.maxBytes),
             },
             ...media,
           ],

packages/core/src/tool/AGENTS.md

@@ -56,3 +56,4 @@ Producer capture limits are separate. For example, Bash keeps `AppProcess.maxOut
 
 - Plugin boot has not been redesigned to register canonical tools through `Tools.Service`; do not redesign it as part of leaf migrations.
 - MCP and future Session-scoped registrations still need an explicit canonical registration design.
+- The public Session result shape currently exposes managed `outputPaths`; full storage encapsulation requires a future opaque managed-output reference design.

packages/core/src/tool/apply-patch.ts

@@ -12,7 +12,7 @@ import { Tools } from "./tools"
 
 export const name = "apply_patch"
 
-export const Parameters = Schema.Struct({
+export const Input = Schema.Struct({
   patchText: Schema.String.annotate({
     description: "The full patch text describing add, update, and delete operations",
   }),
@@ -24,10 +24,10 @@ export const Applied = Schema.Struct({
   target: Schema.String,
 })
 
-export const Success = Schema.Struct({ applied: Schema.Array(Applied) })
-export type Success = typeof Success.Type
+export const Output = Schema.Struct({ applied: Schema.Array(Applied) })
+export type Output = typeof Output.Type
 
-export const toModelOutput = (output: Success) =>
+export const toModelOutput = (output: Output) =>
   [
     "Applied patch sequentially:",
     ...output.applied.map(
@@ -57,8 +57,8 @@ export const layer = Layer.effectDiscard(
           Tool.make({
             description:
               "Apply one patch containing add, update, and delete file operations. All targets are resolved and approved before target contents are read. Operations apply sequentially; if a later operation fails, earlier operations remain applied and the failure reports them explicitly. Moves and atomic rollback are not supported yet.",
-            input: Parameters,
-            output: Success,
+            input: Input,
+            output: Output,
             toModelOutput: ({ output }) => [toolText({ type: "text", text: toModelOutput(output) })],
             execute: (input, context) => {
               const applied: Array<typeof Applied.Type> = []

packages/core/src/tool/bash.ts

@@ -18,7 +18,7 @@ export const DEFAULT_TIMEOUT_MS = 2 * 60 * 1_000
 export const MAX_TIMEOUT_MS = 10 * 60 * 1_000
 export const MAX_CAPTURE_BYTES = 1024 * 1024
 
-export const Parameters = Schema.Struct({
+export const Input = Schema.Struct({
   command: Schema.String.annotate({ description: "Shell command string to execute" }),
   workdir: Schema.String.pipe(Schema.optional).annotate({
     description: "Working directory. Defaults to the active Location; relative paths resolve from that Location.",
@@ -33,7 +33,7 @@ export const Parameters = Schema.Struct({
   }),
 })
 
-const Success = Schema.Struct({
+const Output = Schema.Struct({
   command: Schema.String,
   cwd: Schema.String,
   exitCode: Schema.Number.pipe(Schema.optional),
@@ -46,7 +46,7 @@ const Success = Schema.Struct({
   warnings: Schema.Array(Schema.String).pipe(Schema.optional),
 })
 
-type Success = typeof Success.Type
+type Output = typeof Output.Type
 
 const defaultShell = () => (process.platform === "win32" ? (process.env.COMSPEC ?? "cmd.exe") : "/bin/sh")
 
@@ -62,7 +62,7 @@ const captureNotice = (stdoutTruncated: boolean, stderrTruncated: boolean) => {
   return undefined
 }
 
-const modelOutput = (output: Success) => {
+const modelOutput = (output: Output) => {
   const warnings = output.warnings?.length
     ? `\n\nWarnings:\n${output.warnings.map((warning) => `- ${warning}`).join("\n")}`
     : ""
@@ -117,8 +117,8 @@ export const layer = Layer.effectDiscard(
       .register({
         [name]: Tool.make({
           description: `Execute one shell command string with the host user's filesystem, process, and network authority. The active Location is the default working directory. Relative workdir values resolve from that Location. External workdir values require external_directory approval; best-effort command-argument path warnings are advisory only. Timeout values are milliseconds (default: ${DEFAULT_TIMEOUT_MS}; maximum: ${MAX_TIMEOUT_MS}). Uses the configured shell when set; otherwise uses /bin/sh on POSIX and COMSPEC or cmd.exe on Windows.`,
-          input: Parameters,
-          output: Success,
+          input: Input,
+          output: Output,
           toModelOutput: ({ output }) => [toolText({ type: "text", text: modelOutput(output) })],
           execute: (input, context) =>
             Effect.gen(function* () {

packages/core/src/tool/edit.ts

@@ -18,7 +18,7 @@ import { Tools } from "./tools"
 
 export const name = "edit"
 
-export const Parameters = Schema.Struct({
+export const Input = Schema.Struct({
   path: Schema.String.annotate({
     description:
       "File path to edit. Relative paths resolve within the active Location. Absolute paths inside that Location are accepted; external absolute paths require external_directory approval. Named project references are read-oriented and are not accepted.",
@@ -30,14 +30,14 @@ export const Parameters = Schema.Struct({
   }),
 })
 
-export const Success = Schema.Struct({
+export const Output = Schema.Struct({
   operation: Schema.Literal("write"),
   target: Schema.String,
   resource: Schema.String,
   existed: Schema.Boolean,
   replacements: Schema.Number,
 })
-export type Success = typeof Success.Type
+export type Output = typeof Output.Type
 
 const normalizeLineEndings = (text: string) => text.replaceAll("\r\n", "\n")
 const detectLineEnding = (text: string): "\n" | "\r\n" => (text.includes("\r\n") ? "\r\n" : "\n")
@@ -70,7 +70,7 @@ const previewLines = (value: string, prefix: "+" | "-") => {
   return shown
 }
 
-export const toModelOutput = (output: Success, oldString: string, newString: string) =>
+export const toModelOutput = (output: Output, oldString: string, newString: string) =>
   [
     `Edited file successfully: ${output.resource}`,
     `Replacements: ${output.replacements}`,
@@ -101,8 +101,8 @@ export const layer = Layer.effectDiscard(
           Tool.make({
             description:
               "Replace exact text in one file. Relative paths resolve within the active Location. Absolute paths inside the Location are accepted. Explicit external absolute paths require external_directory approval before edit approval. Named project references are read-oriented and are not accepted.",
-            input: Parameters,
-            output: Success,
+            input: Input,
+            output: Output,
             toModelOutput: ({ input, output }) => [
               toolText({ type: "text", text: toModelOutput(output, input.oldString, input.newString) }),
             ],
@@ -188,7 +188,7 @@ export const layer = Layer.effectDiscard(
                     content: joinBom(next.text, source.bom || next.bom),
                   }),
                 )
-                return { ...result, replacements } satisfies Success
+                return { ...result, replacements } satisfies Output
               })
             },
           }),

packages/core/src/tool/glob.ts

@@ -10,7 +10,7 @@ import { Tools } from "./tools"
 
 export const name = "glob"
 
-export const Parameters = Schema.Struct({
+export const Input = Schema.Struct({
   pattern: LocationSearch.FilesInput.fields.pattern.annotate({ description: "Glob pattern to match files against" }),
   path: LocationSearch.FilesInput.fields.path.annotate({
     description: "Relative directory to search. Defaults to the active Location.",
@@ -56,7 +56,7 @@ export const layer = Layer.effectDiscard(
         [name]: Tool.make({
           description:
             "Find files by glob pattern within the active Location or a named project reference. Returns concise relative file resources. Use a relative path to narrow the search and limit to bound the result count.",
-          input: Parameters,
+          input: Input,
           output: LocationSearch.FilesResult,
           toModelOutput: ({ output }) => [toolText({ type: "text", text: toModelOutput(output) })],
           execute: (input, context) =>

packages/core/src/tool/grep.ts

@@ -11,7 +11,7 @@ import { Tools } from "./tools"
 
 export const name = "grep"
 
-export const Parameters = Schema.Struct({
+export const Input = Schema.Struct({
   pattern: LocationSearch.GrepInput.fields.pattern.annotate({
     description: "Regex pattern to search for in file contents",
   }),
@@ -29,10 +29,10 @@ export const Parameters = Schema.Struct({
   }),
 })
 
-type Success = typeof LocationSearch.GrepResult.Encoded
+type Output = typeof LocationSearch.GrepResult.Encoded
 
 /** Format raw Location search matches into the familiar concise model output. */
-export const toModelOutput = (output: Success) => {
+export const toModelOutput = (output: Output) => {
   const lines = output.items.length === 0 ? ["No files found"] : [`Found ${output.items.length} matches`]
   let current = ""
   for (const match of output.items) {
@@ -71,7 +71,7 @@ export const layer = Layer.effectDiscard(
         [name]: Tool.make({
           description:
             "Search file contents by regular expression within the active Location, a named project reference, or an absolute managed tool-output file. Use a path to narrow the search, include to filter files by glob, and limit to bound the match count. Returns concise file resources, line numbers, and bounded line previews.",
-          input: Parameters,
+          input: Input,
           output: LocationSearch.GrepResult,
           toModelOutput: ({ output }) => [toolText({ type: "text", text: toModelOutput(output) })],
           execute: (input, context) =>

packages/core/src/tool/question.ts

@@ -20,14 +20,14 @@ Usage notes:
 - Answers are returned as arrays of labels; set \`multiple: true\` to allow selecting more than one
 - If you recommend a specific option, make that the first option in the list and add "(Recommended)" at the end of the label`
 
-export const Parameters = Schema.Struct({
+export const Input = Schema.Struct({
   questions: Schema.Array(QuestionV2.Prompt).annotate({ description: "Questions to ask" }),
 })
 
-export const Success = Schema.Struct({
+export const Output = Schema.Struct({
   answers: Schema.Array(QuestionV2.Answer),
 })
-export type Success = typeof Success.Type
+export type Output = typeof Output.Type
 
 export const toModelOutput = (
   questions: ReadonlyArray<QuestionV2.Prompt>,
@@ -52,8 +52,8 @@ export const layer = Layer.effectDiscard(
       .register({
         [name]: Tool.make({
           description,
-          input: Parameters,
-          output: Success,
+          input: Input,
+          output: Output,
           toModelOutput: ({ input, output }) => [
             toolText({ type: "text", text: toModelOutput(input.questions, output.answers) }),
           ],

packages/core/src/tool/read.ts

@@ -20,7 +20,7 @@ const LocationInput = Schema.Struct({
   }),
 })
 const Input = LocationInput
-const Success = Schema.Union([FileSystem.Content, FileSystem.TextPage, FileSystem.ListPage])
+const Output = Schema.Union([FileSystem.Content, FileSystem.TextPage, FileSystem.ListPage])
 
 export const layer = Layer.effectDiscard(
   Effect.gen(function* () {
@@ -35,7 +35,7 @@ export const layer = Layer.effectDiscard(
           description:
             "Read a text file or supported image, page through a large UTF-8 text file by line offset, or list a directory page relative to the current location. Absolute paths are accepted only for managed tool-output files.",
           input: Input,
-          output: Success,
+          output: Output,
           toModelOutput: ({ input, output }) => {
             if (!("type" in output) || output.type !== "binary" || !SUPPORTED_IMAGE_MIMES.has(output.mime)) return []
             return [