.

packages/opencode/src/session/llm.ts

@@ -207,11 +207,7 @@ const live: Layer.Layer<
         input.model.providerID.toLowerCase().includes("litellm") ||
         input.model.api.id.toLowerCase().includes("litellm")
 
-      const repair = (toolName: string) => {
+      const repair = (toolName: string) => repairToolName(toolName, tools)
-        const next = toolName.toLowerCase()
-        if (!tools[next]) return
-        return next
-      }
 
       // LiteLLM/Bedrock rejects requests where the message history contains tool
       // calls but no tools param is present. When there are no active tools (e.g.
@@ -449,6 +445,12 @@ export const defaultLayer = Layer.suspend(() =>
   ),
 )
 
+export function repairToolName(toolName: string, tools: Record<string, Tool>) {
+  const next = ShellToolID.normalize(toolName.toLowerCase())
+  if (!tools[next]) return
+  return next
+}
+
 function resolveTools(input: Pick<StreamInput, "tools" | "agent" | "permission" | "user">) {
   const disabled = Permission.disabled(
     Object.keys(input.tools),

packages/opencode/test/session/llm.test.ts

@@ -1,6 +1,6 @@
 import { afterAll, beforeAll, beforeEach, describe, expect, test } from "bun:test"
 import path from "path"
-import { tool, type ModelMessage } from "ai"
+import { tool, type ModelMessage, type Tool } from "ai"
 import { Cause, Effect, Exit, Stream } from "effect"
 import z from "zod"
 import { makeRuntime } from "../../src/effect/run-service"
@@ -119,6 +119,17 @@ describe("session.llm.hasToolCalls", () => {
   })
 })
 
+describe("session.llm.repairToolName", () => {
+  test("normalizes legacy bash alias to shell when available", () => {
+    expect(LLM.repairToolName("bash", { shell: {} as Tool })).toBe("shell")
+    expect(LLM.repairToolName("BASH", { shell: {} as Tool })).toBe("shell")
+  })
+
+  test("returns undefined when normalized tool is unavailable", () => {
+    expect(LLM.repairToolName("bash", { read: {} as Tool })).toBeUndefined()
+  })
+})
+
 type Capture = {
   url: URL
   headers: Headers

packages/ui/src/components/tool-error-card.tsx

@@ -34,6 +34,7 @@ export function ToolErrorCard(props: ToolErrorCardProps) {
       webfetch: "ui.tool.webfetch",
       websearch: "ui.tool.websearch",
       codesearch: "ui.tool.codesearch",
+      bash: "ui.tool.shell",
       shell: "ui.tool.shell",
       apply_patch: "ui.tool.patch",
       question: "ui.tool.questions",