diff --git a/packages/client/src/promise/generated/types.ts b/packages/client/src/promise/generated/types.ts
index a7cff8254aa..4d51de939f7 100644
--- a/packages/client/src/promise/generated/types.ts
+++ b/packages/client/src/promise/generated/types.ts
@@ -188,6 +188,7 @@ export type ShellInfo = {
   file: string
   pid?: number
   exit?: number
+  signal?: string
   metadata: { [x: string]: any }
   time: { started: number; completed?: number }
 }
@@ -395,6 +396,7 @@ export type ShellInfo1 = {
   file: string
   pid?: number
   exit?: number
+  signal?: string
   metadata: { [x: string]: JsonValue }
   time: { started: number; completed?: number }
 }
diff --git a/packages/core/src/shell.ts b/packages/core/src/shell.ts
index d7a9125cc8c..472ab0a0b58 100644
--- a/packages/core/src/shell.ts
+++ b/packages/core/src/shell.ts
@@ -6,6 +6,7 @@ import { ChildProcess } from "effect/unstable/process"
 import { produce } from "immer"
 import { Shell } from "@opencode/schema/shell"
 import { AppProcess } from "@opencode/util/process"
+import { CrossSpawnSpawner } from "@opencode/util/cross-spawn-spawner"
 import { makeGlobalNode, makeLocationNode } from "@opencode/util/effect/app-node"
 import { FSUtil } from "@opencode/util/fs-util"
 import { Bus } from "./bus.js"
@@ -345,12 +346,13 @@ const layer = () =>
                   }),
               )
 
-              const finish = (status: Info["status"], exit?: number, beforeWait = Effect.void) =>
+              const finish = (status: Info["status"], exit?: number, beforeWait = Effect.void, signal?: string) =>
                 Effect.gen(function* () {
                   if (command.info.status !== "running") return
                   command.info = produce(command.info, (draft) => {
                     draft.status = status
                     if (exit !== undefined) draft.exit = exit
+                    if (signal !== undefined) draft.signal = signal
                     draft.time.completed = Date.now()
                   })
                   yield* beforeWait
@@ -401,7 +403,14 @@ const layer = () =>
               runFork(
                 handle.exitCode.pipe(
                   Effect.flatMap((code) => finish("exited", code)),
-                  Effect.catch(() => finish("exited")),
+                  Effect.catch((error) =>
+                    finish(
+                      "exited",
+                      undefined,
+                      Effect.void,
+                      error.cause instanceof CrossSpawnSpawner.KilledBySignal ? error.cause.signal : undefined,
+                    ),
+                  ),
                 ),
               )
 
diff --git a/packages/core/src/shell/result.ts b/packages/core/src/shell/result.ts
index ef7dfa5ed06..b9dc352e86f 100644
--- a/packages/core/src/shell/result.ts
+++ b/packages/core/src/shell/result.ts
@@ -7,7 +7,7 @@ export type Result = {
   capture: { output: string; truncated: boolean } | undefined
 }
 
-type Output = { output: string; truncated: boolean; exit?: number; timeout?: boolean }
+type Output = { output: string; truncated: boolean; exit?: number; signal?: string; timeout?: boolean }
 
 const missing = "Shell command output is no longer available."
 export const unavailable: Shell.Output = {
@@ -22,12 +22,14 @@ export function output(result: Result): Output {
     output: result.capture?.output ?? unavailable.output,
     truncated: result.capture?.truncated ?? false,
     ...(result.info.exit !== undefined ? { exit: result.info.exit } : {}),
+    ...(result.info.signal !== undefined ? { signal: result.info.signal } : {}),
     ...(result.info.status === "timeout" ? { timeout: true } : {}),
   }
 }
 
-export function notice(output: Pick<Output, "exit" | "timeout">) {
+export function notice(output: Pick<Output, "exit" | "signal" | "timeout">) {
   if (output.timeout) return "Timed out before completion"
+  if (output.signal !== undefined) return `Killed by ${output.signal}`
   if (output.exit !== undefined && output.exit !== 0) return `Exited with code ${output.exit}`
 }
 
@@ -35,6 +37,7 @@ export function metadata(output: Output) {
   return {
     truncated: output.truncated,
     ...(output.exit !== undefined ? { exit: output.exit } : {}),
+    ...(output.signal !== undefined ? { signal: output.signal } : {}),
     ...(output.timeout !== undefined ? { timeout: output.timeout } : {}),
   }
 }
diff --git a/packages/core/src/tool/plugin/shell.ts b/packages/core/src/tool/plugin/shell.ts
index df08402a9ef..87be4c9d165 100644
--- a/packages/core/src/tool/plugin/shell.ts
+++ b/packages/core/src/tool/plugin/shell.ts
@@ -61,6 +61,7 @@ export const Input = Schema.Struct({
 
 const StructuredOutput = Schema.Struct({
   exit: Schema.optionalKey(Schema.Number),
+  signal: Schema.optionalKey(Schema.String),
   shellID: Schema.optionalKey(Schema.String),
   truncated: Schema.Boolean,
   timeout: Schema.optionalKey(Schema.Boolean),
diff --git a/packages/core/test/tool-shell.test.ts b/packages/core/test/tool-shell.test.ts
index a690161c8c8..f87f95c1879 100644
--- a/packages/core/test/tool-shell.test.ts
+++ b/packages/core/test/tool-shell.test.ts
@@ -1679,7 +1679,7 @@ describe("ShellTool", () => {
               process.kill(-info.pid, "SIGTERM")
               const result = yield* shell.wait(id).pipe(Effect.timeoutOption(Duration.seconds(1)))
               expect(result._tag).toBe("Some")
-              if (result._tag === "Some") expect(result.value.status).toBe("exited")
+              if (result._tag === "Some") expect(result.value).toMatchObject({ status: "exited", signal: "SIGTERM" })
               expect((yield* shell.list()).map((item) => item.id)).not.toContain(id)
             }),
           )
diff --git a/packages/schema/src/shell.ts b/packages/schema/src/shell.ts
index 2a30c77d86a..251a61417b1 100644
--- a/packages/schema/src/shell.ts
+++ b/packages/schema/src/shell.ts
@@ -45,6 +45,7 @@ export const Info = Schema.Struct({
   file: Schema.String,
   pid: optional(NonNegativeInt),
   exit: optional(Schema.Finite),
+  signal: optional(Schema.String),
   // Always present; defaults to an empty object when the creator supplies no metadata.
   metadata: Metadata,
   time: Time,
diff --git a/packages/util/src/cross-spawn-spawner.ts b/packages/util/src/cross-spawn-spawner.ts
index a8f8623d0a5..ffd9071cb02 100644
--- a/packages/util/src/cross-spawn-spawner.ts
+++ b/packages/util/src/cross-spawn-spawner.ts
@@ -85,6 +85,15 @@ const toPlatformError = (
   })
 }
 
+export class KilledBySignal extends Error {
+  readonly signal: NodeJS.Signals
+
+  constructor(signal: NodeJS.Signals) {
+    super(`Process interrupted due to receipt of signal: '${signal}'`)
+    this.signal = signal
+  }
+}
+
 type ExitSignal = Deferred.Deferred<readonly [code: number | null, signal: NodeJS.Signals | null]>
 type Spawned = readonly [process: NodeChildProcess.ChildProcess, closed: ExitSignal, exited: ExitSignal]
 
@@ -471,13 +480,8 @@ const makeCrossSpawnSpawner = Effect.gen(function* () {
             }),
             exitCode: Effect.flatMap(completion, ([code, signal]) => {
               if (Predicate.isNotNull(code)) return Effect.succeed(ExitCode(code))
-              return Effect.fail(
-                toPlatformError(
-                  "exitCode",
-                  new Error(`Process interrupted due to receipt of signal: '${signal}'`),
-                  command,
-                ),
-              )
+              // Node reports a signal whenever the exit code is null.
+              return Effect.fail(toPlatformError("exitCode", new KilledBySignal(signal!), command))
             }),
             kill: (opts?: ChildProcess.KillOptions) => stop(command, proc, closed, stopOutput, opts),
             unref: Effect.sync(() => {