fix: replace isDeepStrictEqual with navigation-aware options comparison

The select cursor highlight was broken because isDeepStrictEqual in
use-select-navigation.ts and use-multi-select-state.ts would fail when
options contained identity-unstable properties (JSX label elements,
function onChange callbacks, computed disabled booleans). This caused
the reset logic to fire on every re-render, resetting focusedValue
back to the first option.

Replace isDeepStrictEqual with optionsNavigateEqual which only compares
properties that affect navigation behavior: value, disabled, and type.
ReactNode labels and function callbacks are intentionally excluded as
they are identity-unstable but don't change navigation semantics.

Fixes #472

.gitignore

@@ -10,4 +10,3 @@ GEMINI.md
 package-lock.json
 /.claude
 coverage/
-.worktrees/

src/components/CustomSelect/use-multi-select-state.ts

@@ -1,5 +1,4 @@
 import { useCallback, useState } from 'react'
-import { isDeepStrictEqual } from 'util'
 import { useRegisterOverlay } from '../../context/overlayContext.js'
 import type { InputEvent } from '../../ink/events/input-event.js'
 // eslint-disable-next-line custom-rules/prefer-use-keybindings -- raw space/arrow multiselect input
@@ -9,6 +8,7 @@ import {
   normalizeFullWidthSpace,
 } from '../../utils/stringUtils.js'
 import type { OptionWithDescription } from './select.js'
+import { optionsNavigateEqual } from './use-select-navigation.js'
 import { useSelectNavigation } from './use-select-navigation.js'
 
 export type UseMultiSelectStateProps<T> = {
@@ -174,7 +174,7 @@ export function useMultiSelectState<T>({
   // and the deleted ui/useMultiSelectState.ts — without this, MCPServerDesktopImportDialog
   // keeps colliding servers checked after getAllMcpConfigs() resolves.
   const [lastOptions, setLastOptions] = useState(options)
-  if (options !== lastOptions && !isDeepStrictEqual(options, lastOptions)) {
+  if (options !== lastOptions && !optionsNavigateEqual(options, lastOptions)) {
     setSelectedValues(defaultValue)
     setLastOptions(options)
   }

src/components/CustomSelect/use-select-navigation.ts

@@ -6,10 +6,34 @@ import {
   useRef,
   useState,
 } from 'react'
-import { isDeepStrictEqual } from 'util'
 import OptionMap from './option-map.js'
 import type { OptionWithDescription } from './select.js'
 
+/**
+ * Compare two option arrays for structural equality on properties that
+ * affect navigation behavior. ReactNode `label` and function `onChange`
+ * are intentionally excluded — they are identity-unstable (new reference
+ * each render) but don't change navigation semantics.
+ */
+export function optionsNavigateEqual<T>(
+  a: OptionWithDescription<T>[],
+  b: OptionWithDescription<T>[],
+): boolean {
+  if (a.length !== b.length) return false
+  for (let i = 0; i < a.length; i++) {
+    const ao = a[i]!
+    const bo = b[i]!
+    if (
+      ao.value !== bo.value ||
+      ao.disabled !== bo.disabled ||
+      ao.type !== bo.type
+    ) {
+      return false
+    }
+  }
+  return true
+}
+
 type State<T> = {
   /**
    * Map where key is option's value and value is option's index.
@@ -524,7 +548,7 @@ export function useSelectNavigation<T>({
 
   const [lastOptions, setLastOptions] = useState(options)
 
-  if (options !== lastOptions && !isDeepStrictEqual(options, lastOptions)) {
+  if (options !== lastOptions && !optionsNavigateEqual(options, lastOptions)) {
     dispatch({
       type: 'reset',
       state: createDefaultState({

src/components/agents/generateAgent.ts

@@ -68,11 +68,11 @@ When a user describes what they want an agent to do, you will:
       assistant: "Now let me use the test-runner agent to run the tests"
     </example>
     - <example>
-      Context: User is creating an agent to respond to the word "hello" with a friendly jok.
+      Context: User is creating an agent for Claude Code product questions.
-      user: "Hello"
+      user: "How do I configure Claude Code hooks?"
-      assistant: "I'm going to use the ${AGENT_TOOL_NAME} tool to launch the greeting-responder agent to respond with a friendly joke"
+      assistant: "I'm going to use the ${AGENT_TOOL_NAME} tool to launch the claude-code-guide agent to answer the question"
       <commentary>
-      Since the user is greeting, use the greeting-responder agent to respond with a friendly joke. 
+      Since the user is asking how to use Claude Code, use the claude-code-guide agent.
       </commentary>
     </example>
   - If the user mentioned or implied that the agent should be used proactively, you should include examples of this.

src/entrypoints/cli.tsx

@@ -8,6 +8,34 @@ import {
   validateProviderEnvOrExit,
 } from '../utils/providerValidation.js'
 
+// OpenClaude: polyfill globalThis.File for Node < 20.
+// undici v7 references `File` at module evaluation time (webidl type
+// assertions). Node 18 lacks the global, causing a ReferenceError inside
+// the bundled __commonJS require chain which deadlocks the process when a
+// proxy is configured (configureGlobalAgents → require_undici).
+// eslint-disable-next-line custom-rules/no-top-level-side-effects
+if (typeof globalThis.File === 'undefined') {
+  try {
+    // Node 18.13+ exposes File in node:buffer but not as a global.
+    // eslint-disable-next-line @typescript-eslint/no-require-imports
+    const { File: NodeFile } = require('node:buffer')
+    // @ts-expect-error -- polyfilling missing global
+    globalThis.File = NodeFile
+  } catch {
+    // Absolute fallback: stub so `MakeTypeAssertion(File)` doesn't throw.
+    // @ts-expect-error -- minimal polyfill
+    globalThis.File = class File extends Blob {
+      name: string
+      lastModified: number
+      constructor(parts: BlobPart[], name: string, opts?: FilePropertyBag) {
+        super(parts, opts)
+        this.name = name
+        this.lastModified = opts?.lastModified ?? Date.now()
+      }
+    }
+  }
+}
+
 // OpenClaude: disable experimental API betas by default.
 // Tool search (defer_loading), global cache scope, and context management
 // require internal API support not available to external accounts → 500.

src/screens/REPL.tsx

@@ -238,7 +238,6 @@ import { usePromptsFromClaudeInChrome } from 'src/hooks/usePromptsFromClaudeInCh
 import { getTipToShowOnSpinner, recordShownTip } from 'src/services/tips/tipScheduler.js';
 import type { Theme } from 'src/utils/theme.js';
 import { isPromptTypingSuppressionActive } from './replInputSuppression.js';
-import { shouldStartStartupChecks } from './replStartupGates.js';
 import { checkAndDisableBypassPermissionsIfNeeded, checkAndDisableAutoModeIfNeeded, useKickOffCheckAndDisableBypassPermissionsIfNeeded, useKickOffCheckAndDisableAutoModeIfNeeded } from 'src/utils/permissions/bypassPermissionsKillswitch.js';
 import { SandboxManager } from 'src/utils/sandbox/sandbox-adapter.js';
 import { SANDBOX_NETWORK_ACCESS_TOOL_NAME } from 'src/cli/structuredIO.js';
@@ -785,6 +784,19 @@ export function REPL({
   });
   const tasksV2 = useTasksV2WithCollapseEffect();
 
+  // Start background plugin installations
+
+  // SECURITY: This code is guaranteed to run ONLY after the "trust this folder" dialog
+  // has been confirmed by the user. The trust dialog is shown in cli.tsx (line ~387)
+  // before the REPL component is rendered. The dialog blocks execution until the user
+  // accepts, and only then is the REPL component mounted and this effect runs.
+  // This ensures that plugin installations from repository and user settings only
+  // happen after explicit user consent to trust the current working directory.
+  useEffect(() => {
+    if (isRemoteSession) return;
+    void performStartupChecks(setAppState);
+  }, [setAppState, isRemoteSession]);
+
   // Allow Claude in Chrome MCP to send prompts through MCP notifications
   // and sync permission mode changes to the Chrome extension
   usePromptsFromClaudeInChrome(isRemoteSession ? EMPTY_MCP_CLIENTS : mcpClients, toolPermissionContext.mode);
@@ -1325,7 +1337,6 @@ export function REPL({
   const [inputValue, setInputValueRaw] = useState(() => consumeEarlyInput());
   const inputValueRef = useRef(inputValue);
   inputValueRef.current = inputValue;
-  const startupChecksStartedRef = useRef(false);
   const promptTypingSuppressionActive = isPromptTypingSuppressionActive(isPromptInputActive, inputValue);
   const insertTextRef = useRef<{
     insert: (text: string) => void;
@@ -1333,24 +1344,6 @@ export function REPL({
     cursorOffset: number;
   } | null>(null);
 
-  // Start background plugin installations after the initial input window is idle.
-  // SECURITY: This still runs only after the "trust this folder" dialog has been
-  // confirmed because the REPL is not mounted until that dialog completes.
-  useEffect(() => {
-    if (
-      !shouldStartStartupChecks({
-        isRemoteSession,
-        promptTypingSuppressionActive,
-        startupChecksStarted: startupChecksStartedRef.current,
-      })
-    ) {
-      return;
-    }
-
-    startupChecksStartedRef.current = true;
-    void performStartupChecks(setAppState);
-  }, [isRemoteSession, promptTypingSuppressionActive, setAppState]);
-
   // Wrap setInputValue to co-locate suppression state updates.
   // Both setState calls happen in the same synchronous context so React
   // batches them into a single render, eliminating the extra render that

src/screens/replStartupGates.test.ts

@@ -1,44 +0,0 @@
-import { describe, expect, test } from 'bun:test'
-import { shouldStartStartupChecks } from './replStartupGates.js'
-
-describe('shouldStartStartupChecks', () => {
-  test('returns false for remote sessions', () => {
-    expect(
-      shouldStartStartupChecks({
-        isRemoteSession: true,
-        promptTypingSuppressionActive: false,
-        startupChecksStarted: false,
-      }),
-    ).toBe(false)
-  })
-
-  test('returns false while prompt typing suppression is active', () => {
-    expect(
-      shouldStartStartupChecks({
-        isRemoteSession: false,
-        promptTypingSuppressionActive: true,
-        startupChecksStarted: false,
-      }),
-    ).toBe(false)
-  })
-
-  test('returns true once local startup is idle and checks have not started', () => {
-    expect(
-      shouldStartStartupChecks({
-        isRemoteSession: false,
-        promptTypingSuppressionActive: false,
-        startupChecksStarted: false,
-      }),
-    ).toBe(true)
-  })
-
-  test('returns false after startup checks have already started', () => {
-    expect(
-      shouldStartStartupChecks({
-        isRemoteSession: false,
-        promptTypingSuppressionActive: false,
-        startupChecksStarted: true,
-      }),
-    ).toBe(false)
-  })
-})

src/screens/replStartupGates.ts

@@ -1,11 +0,0 @@
-export function shouldStartStartupChecks(options: {
-  isRemoteSession: boolean
-  promptTypingSuppressionActive: boolean
-  startupChecksStarted: boolean
-}): boolean {
-  return (
-    !options.isRemoteSession &&
-    !options.promptTypingSuppressionActive &&
-    !options.startupChecksStarted
-  )
-}

src/services/api/codexShim.test.ts

@@ -201,6 +201,117 @@ describe('Codex request translation', () => {
     ])
   })
 
+  test('preserves Grep tool pattern field in Codex strict schemas', () => {
+    const tools = convertToolsToResponsesTools([
+      {
+        name: 'Grep',
+        description: 'Search file contents',
+        input_schema: {
+          type: 'object',
+          properties: {
+            pattern: { type: 'string', description: 'Search pattern' },
+            path: { type: 'string' },
+          },
+          required: ['pattern'],
+          additionalProperties: false,
+        },
+      },
+    ])
+
+    expect(tools).toEqual([
+      {
+        type: 'function',
+        name: 'Grep',
+        description: 'Search file contents',
+        parameters: {
+          type: 'object',
+          properties: {
+            pattern: { type: 'string', description: 'Search pattern' },
+            path: { type: 'string' },
+          },
+          required: ['pattern', 'path'],
+          additionalProperties: false,
+        },
+        strict: true,
+      },
+    ])
+  })
+
+  test('preserves Glob tool pattern field in Codex strict schemas', () => {
+    const tools = convertToolsToResponsesTools([
+      {
+        name: 'Glob',
+        description: 'Find files by pattern',
+        input_schema: {
+          type: 'object',
+          properties: {
+            pattern: { type: 'string', description: 'Glob pattern' },
+            path: { type: 'string' },
+          },
+          required: ['pattern'],
+          additionalProperties: false,
+        },
+      },
+    ])
+
+    expect(tools).toEqual([
+      {
+        type: 'function',
+        name: 'Glob',
+        description: 'Find files by pattern',
+        parameters: {
+          type: 'object',
+          properties: {
+            pattern: { type: 'string', description: 'Glob pattern' },
+            path: { type: 'string' },
+          },
+          required: ['pattern', 'path'],
+          additionalProperties: false,
+        },
+        strict: true,
+      },
+    ])
+  })
+
+  test('strips validator pattern keyword but keeps string field named pattern in Codex schemas', () => {
+    const tools = convertToolsToResponsesTools([
+      {
+        name: 'RegexProbe',
+        description: 'Probe regex schema handling',
+        input_schema: {
+          type: 'object',
+          properties: {
+            pattern: {
+              type: 'string',
+              pattern: '^[a-z]+$',
+            },
+          },
+          required: ['pattern'],
+          additionalProperties: false,
+        },
+      },
+    ])
+
+    expect(tools).toEqual([
+      {
+        type: 'function',
+        name: 'RegexProbe',
+        description: 'Probe regex schema handling',
+        parameters: {
+          type: 'object',
+          properties: {
+            pattern: {
+              type: 'string',
+            },
+          },
+          required: ['pattern'],
+          additionalProperties: false,
+        },
+        strict: true,
+      },
+    ])
+  })
+
   test('removes unsupported uri format from strict Responses schemas', () => {
     const tools = convertToolsToResponsesTools([
       {

src/services/api/openaiShim.test.ts

@@ -261,6 +261,73 @@ test('preserves Gemini tool call extra_content in follow-up requests', async ()
   })
 })
 
+test('preserves Grep tool pattern field in OpenAI-compatible schemas', async () => {
+  let requestBody: Record<string, unknown> | undefined
+
+  globalThis.fetch = (async (_input, init) => {
+    requestBody = JSON.parse(String(init?.body))
+
+    return new Response(
+      JSON.stringify({
+        id: 'chatcmpl-grep-schema',
+        model: 'qwen/qwen3.6-plus',
+        choices: [
+          {
+            message: {
+              role: 'assistant',
+              content: 'done',
+            },
+            finish_reason: 'stop',
+          },
+        ],
+        usage: {
+          prompt_tokens: 12,
+          completion_tokens: 4,
+          total_tokens: 16,
+        },
+      }),
+      {
+        headers: {
+          'Content-Type': 'application/json',
+        },
+      },
+    )
+  }) as FetchType
+
+  const client = createOpenAIShimClient({}) as OpenAIShimClient
+
+  await client.beta.messages.create({
+    model: 'qwen/qwen3.6-plus',
+    system: 'test system',
+    messages: [{ role: 'user', content: 'Use Grep' }],
+    tools: [
+      {
+        name: 'Grep',
+        description: 'Search file contents',
+        input_schema: {
+          type: 'object',
+          properties: {
+            pattern: { type: 'string', description: 'Search pattern' },
+            path: { type: 'string' },
+          },
+          required: ['pattern'],
+          additionalProperties: false,
+        },
+      },
+    ],
+    max_tokens: 64,
+    stream: false,
+  })
+
+  const tools = requestBody?.tools as Array<Record<string, unknown>> | undefined
+  const grepTool = tools?.find(tool => (tool.function as Record<string, unknown>)?.name === 'Grep') as
+    | { function?: { parameters?: { properties?: Record<string, unknown>; required?: string[] } } }
+    | undefined
+
+  expect(Object.keys(grepTool?.function?.parameters?.properties ?? {})).toContain('pattern')
+  expect(grepTool?.function?.parameters?.required).toContain('pattern')
+})
+
 test('does not infer Gemini mode from OPENAI_BASE_URL path substrings', async () => {
   let capturedAuthorization: string | null = null
 

src/services/api/openaiShim.ts

@@ -195,10 +195,12 @@ function convertContentBlocks(
         // handled separately
         break
       case 'thinking':
-        // Append thinking as text with a marker for models that support reasoning
+      case 'redacted_thinking':
-        if (block.thinking) {
+        // Strip thinking blocks for OpenAI-compatible providers.
-          parts.push({ type: 'text', text: `<thinking>${block.thinking}</thinking>` })
+        // These are Anthropic-specific content types that 3P providers
-        }
+        // don't understand. Serializing them as <thinking> text corrupts
+        // multi-turn context: the model sees the tags as part of its
+        // previous reply and may mimic or misattribute them.
         break
       default:
         if (block.text) {

src/services/tools/toolExecution.test.ts

@@ -0,0 +1,33 @@
+import { describe, expect, test } from 'bun:test'
+
+import { SkillTool } from '../../tools/SkillTool/SkillTool.js'
+import {
+  getSchemaValidationErrorOverride,
+  getSchemaValidationToolUseResult,
+} from './toolExecution.js'
+
+describe('getSchemaValidationErrorOverride', () => {
+  test('returns actionable missing-skill error for SkillTool', () => {
+    expect(getSchemaValidationErrorOverride(SkillTool, {})).toBe(
+      'Missing skill name. Pass the slash command name as the skill parameter (e.g., skill: "commit" for /commit, skill: "review-pr" for /review-pr).',
+    )
+  })
+
+  test('does not override unrelated tool schema failures', () => {
+    expect(getSchemaValidationErrorOverride({ name: 'Read' } as never, {})).toBe(
+      null,
+    )
+  })
+
+  test('does not override SkillTool when skill is present', () => {
+    expect(
+      getSchemaValidationErrorOverride(SkillTool, { skill: 'commit' }),
+    ).toBe(null)
+  })
+
+  test('uses the actionable override for structured toolUseResult too', () => {
+    expect(getSchemaValidationToolUseResult(SkillTool, {} as never)).toBe(
+      'InputValidationError: Missing skill name. Pass the slash command name as the skill parameter (e.g., skill: "commit" for /commit, skill: "review-pr" for /review-pr).',
+    )
+  })
+})

src/services/tools/toolExecution.ts

@@ -43,6 +43,7 @@ import { FILE_READ_TOOL_NAME } from '../../tools/FileReadTool/prompt.js'
 import { FILE_WRITE_TOOL_NAME } from '../../tools/FileWriteTool/prompt.js'
 import { NOTEBOOK_EDIT_TOOL_NAME } from '../../tools/NotebookEditTool/constants.js'
 import { POWERSHELL_TOOL_NAME } from '../../tools/PowerShellTool/toolName.js'
+import { SKILL_TOOL_NAME } from '../../tools/SkillTool/constants.js'
 import { parseGitCommitId } from '../../tools/shared/gitOperationTracking.js'
 import {
   isDeferredTool,
@@ -596,6 +597,31 @@ export function buildSchemaNotSentHint(
   )
 }
 
+export function getSchemaValidationErrorOverride(
+  tool: Tool,
+  input: unknown,
+): string | null {
+  if (tool.name !== SKILL_TOOL_NAME || !input || typeof input !== 'object') {
+    return null
+  }
+
+  const skill = (input as { skill?: unknown }).skill
+  if (skill === undefined || skill === null) {
+    return 'Missing skill name. Pass the slash command name as the skill parameter (e.g., skill: "commit" for /commit, skill: "review-pr" for /review-pr).'
+  }
+
+  return null
+}
+
+export function getSchemaValidationToolUseResult(
+  tool: Tool,
+  input: unknown,
+  fallbackMessage?: string,
+): string {
+  const override = getSchemaValidationErrorOverride(tool, input)
+  return `InputValidationError: ${override ?? fallbackMessage ?? ''}`
+}
+
 async function checkPermissionsAndCallTool(
   tool: Tool,
   toolUseID: string,
@@ -614,7 +640,9 @@ async function checkPermissionsAndCallTool(
   // Validate input types with zod (surprisingly, the model is not great at generating valid input)
   const parsedInput = tool.inputSchema.safeParse(input)
   if (!parsedInput.success) {
-    let errorContent = formatZodValidationError(tool.name, parsedInput.error)
+    const fallbackErrorContent = formatZodValidationError(tool.name, parsedInput.error)
+    let errorContent =
+      getSchemaValidationErrorOverride(tool, input) ?? fallbackErrorContent
 
     const schemaHint = buildSchemaNotSentHint(
       tool,
@@ -672,7 +700,11 @@ async function checkPermissionsAndCallTool(
               tool_use_id: toolUseID,
             },
           ],
-          toolUseResult: `InputValidationError: ${parsedInput.error.message}`,
+          toolUseResult: getSchemaValidationToolUseResult(
+            tool,
+            input,
+            parsedInput.error.message,
+          ),
           sourceToolAssistantUUID: assistantMessage.uuid,
         }),
       },

src/tools/AgentTool/prompt.ts

@@ -156,34 +156,24 @@ ${AGENT_TOOL_NAME}({
   const currentExamples = `Example usage:
 
 <example_agent_descriptions>
-"test-runner": use this agent after you are done writing code to run tests
+"claude-code-guide": use this agent when the user asks how Claude Code works or how to use its features
-"greeting-responder": use this agent to respond to user greetings with a friendly joke
+"statusline-setup": use this agent to configure the user's Claude Code status line setting
 </example_agent_descriptions>
 
 <example>
-user: "Please write a function that checks if a number is prime"
+user: "How do I configure Claude Code hooks?"
-assistant: I'm going to use the ${FILE_WRITE_TOOL_NAME} tool to write the following code:
-<code>
-function isPrime(n) {
-  if (n <= 1) return false
-  for (let i = 2; i * i <= n; i++) {
-    if (n % i === 0) return false
-  }
-  return true
-}
-</code>
 <commentary>
-Since a significant piece of code was written and the task was completed, now use the test-runner agent to run the tests
+This is a Claude Code usage question, so use the claude-code-guide agent
 </commentary>
-assistant: Uses the ${AGENT_TOOL_NAME} tool to launch the test-runner agent
+assistant: Uses the ${AGENT_TOOL_NAME} tool to launch the claude-code-guide agent
 </example>
 
 <example>
-user: "Hello"
+user: "Set up my Claude Code status line"
 <commentary>
-Since the user is greeting, use the greeting-responder agent to respond with a friendly joke
+This matches the statusline-setup agent, so use it to configure the setting
 </commentary>
-assistant: "I'm going to use the ${AGENT_TOOL_NAME} tool to launch the greeting-responder agent"
+assistant: "I'm going to use the ${AGENT_TOOL_NAME} tool to launch the statusline-setup agent"
 </example>
 `
 

src/tools/SkillTool/SkillTool.test.ts

@@ -0,0 +1,31 @@
+import { describe, expect, test } from 'bun:test'
+
+import { SkillTool } from './SkillTool.js'
+
+describe('SkillTool missing parameter handling', () => {
+  test('missing skill stays required at the schema level', async () => {
+    const parsed = SkillTool.inputSchema.safeParse({})
+
+    expect(parsed.success).toBe(false)
+  })
+
+  test('validateInput still returns an actionable error when called with missing skill', async () => {
+    const result = await SkillTool.validateInput?.({} as never, {
+      options: { tools: [] },
+      messages: [],
+    } as never)
+
+    expect(result).toEqual({
+      result: false,
+      message:
+        'Missing skill name. Pass the slash command name as the skill parameter (e.g., skill: "commit" for /commit, skill: "review-pr" for /review-pr).',
+      errorCode: 1,
+    })
+  })
+
+  test('valid skill input still parses and validates', async () => {
+    const parsed = SkillTool.inputSchema.safeParse({ skill: 'commit' })
+
+    expect(parsed.success).toBe(true)
+  })
+})

src/tools/SkillTool/SkillTool.ts

@@ -352,6 +352,16 @@ export const SkillTool: Tool<InputSchema, Output, Progress> = buildTool({
   toAutoClassifierInput: ({ skill }) => skill ?? '',
 
   async validateInput({ skill }, context): Promise<ValidationResult> {
+    if (!skill || typeof skill !== 'string') {
+      return {
+        result: false,
+        message:
+          'Missing skill name. Pass the slash command name as the skill parameter ' +
+          '(e.g., skill: "commit" for /commit, skill: "review-pr" for /review-pr).',
+        errorCode: 1,
+      }
+    }
+
     // Skills are just skill names, no arguments
     const trimmed = skill.trim()
     if (!trimmed) {
@@ -434,7 +444,7 @@ export const SkillTool: Tool<InputSchema, Output, Progress> = buildTool({
     context,
   ): Promise<PermissionDecision> {
     // Skills are just skill names, no arguments
-    const trimmed = skill.trim()
+    const trimmed = skill ?? ''
 
     // Remove leading slash if present (for compatibility)
     const commandName = trimmed.startsWith('/') ? trimmed.substring(1) : trimmed
@@ -592,7 +602,7 @@ export const SkillTool: Tool<InputSchema, Output, Progress> = buildTool({
     // - Skill is a prompt-based skill
 
     // Skills are just names, with optional arguments
-    const trimmed = skill.trim()
+    const trimmed = skill ?? ''
 
     // Remove leading slash if present (for compatibility)
     const commandName = trimmed.startsWith('/') ? trimmed.substring(1) : trimmed

src/utils/api.test.ts

@@ -1,6 +1,7 @@
 import { expect, test } from 'bun:test'
 import { z } from 'zod/v4'
 import { getEmptyToolPermissionContext, type Tool, type Tools } from '../Tool.js'
+import { SkillTool } from '../tools/SkillTool/SkillTool.js'
 import { toolToAPISchema } from './api.js'
 
 test('toolToAPISchema preserves provider-specific schema keywords in input_schema', async () => {
@@ -64,3 +65,16 @@ test('toolToAPISchema preserves provider-specific schema keywords in input_schem
     },
   })
 })
+
+test('toolToAPISchema keeps skill required for SkillTool', async () => {
+  const schema = await toolToAPISchema(SkillTool, {
+    getToolPermissionContext: async () => getEmptyToolPermissionContext(),
+    tools: [] as unknown as Tools,
+    agents: [],
+  })
+
+  expect((schema as { input_schema: unknown }).input_schema).toMatchObject({
+    type: 'object',
+    required: ['skill'],
+  })
+})

src/utils/context.test.ts

@@ -94,3 +94,22 @@ test('gpt-5.4 family keeps large max output overrides within provider limits', (
   expect(getMaxOutputTokensForModel('gpt-5.4-mini')).toBe(128_000)
   expect(getMaxOutputTokensForModel('gpt-5.4-nano')).toBe(128_000)
 })
+
+test('MiniMax-M2.7 uses explicit provider-specific context and output caps', () => {
+  process.env.CLAUDE_CODE_USE_OPENAI = '1'
+  delete process.env.CLAUDE_CODE_MAX_OUTPUT_TOKENS
+
+  expect(getContextWindowForModel('MiniMax-M2.7')).toBe(204_800)
+  expect(getModelMaxOutputTokens('MiniMax-M2.7')).toEqual({
+    default: 131_072,
+    upperLimit: 131_072,
+  })
+  expect(getMaxOutputTokensForModel('MiniMax-M2.7')).toBe(131_072)
+})
+
+test('unknown openai-compatible models still use the conservative fallback window', () => {
+  process.env.CLAUDE_CODE_USE_OPENAI = '1'
+  delete process.env.CLAUDE_CODE_MAX_OUTPUT_TOKENS
+
+  expect(getContextWindowForModel('some-unknown-3p-model')).toBe(8_000)
+})

src/utils/context.ts

@@ -72,16 +72,23 @@ export function getContextWindowForModel(
     return 1_000_000
   }
 
-  // OpenAI-compatible provider — use known context windows for the model
+  // OpenAI-compatible provider — use known context windows for the model.
-  if (
+  // Unknown models get a conservative 8k default so auto-compact triggers
+  // before hitting a hard context_window_exceeded error.
+  const isOpenAIProvider =
     isEnvTruthy(process.env.CLAUDE_CODE_USE_OPENAI) ||
     isEnvTruthy(process.env.CLAUDE_CODE_USE_GEMINI) ||
     isEnvTruthy(process.env.CLAUDE_CODE_USE_GITHUB)
-  ) {
+  if (isOpenAIProvider) {
     const openaiWindow = getOpenAIContextWindow(model)
     if (openaiWindow !== undefined) {
       return openaiWindow
     }
+    console.error(
+      `[context] Warning: model "${model}" not in context window table — using conservative 8k default. ` +
+      'Add it to src/utils/model/openaiContextWindows.ts for accurate compaction.',
+    )
+    return 8_000
   }
 
   const cap = getModelCapability(model)

src/utils/conversationRecovery.hooks.test.ts

@@ -69,3 +69,93 @@ test('loadConversationForResume rejects oversized transcripts before resume hook
   )
   expect(hookSpy).not.toHaveBeenCalled()
 })
+
+test('deserializeMessagesWithInterruptDetection strips thinking blocks only for OpenAI-compatible providers', async () => {
+  const serializedMessages = [
+    user(id(10), 'hello'),
+    {
+      type: 'assistant',
+      uuid: id(11),
+      parentUuid: id(10),
+      timestamp: ts,
+      cwd: '/tmp',
+      sessionId,
+      version: 'test',
+      message: {
+        role: 'assistant',
+        content: [
+          { type: 'thinking', thinking: 'secret reasoning' },
+          { type: 'text', text: 'visible reply' },
+        ],
+      },
+    },
+    {
+      type: 'assistant',
+      uuid: id(12),
+      parentUuid: id(11),
+      timestamp: ts,
+      cwd: '/tmp',
+      sessionId,
+      version: 'test',
+      message: {
+        role: 'assistant',
+        content: [{ type: 'thinking', thinking: 'only hidden reasoning' }],
+      },
+    },
+    user(id(13), 'follow up'),
+  ]
+
+  mock.module('./model/providers.js', () => ({
+    getAPIProvider: () => 'openai',
+    isOpenAICompatibleProvider: (provider: string) =>
+      provider === 'openai' ||
+      provider === 'gemini' ||
+      provider === 'github' ||
+      provider === 'codex',
+  }))
+
+  const openaiModule = await import(`./conversationRecovery.ts?provider=openai-${Date.now()}`)
+  const thirdParty = openaiModule.deserializeMessagesWithInterruptDetection(serializedMessages as never[])
+  const thirdPartyAssistantMessages = thirdParty.messages.filter(
+    message => message.type === 'assistant',
+  )
+
+  expect(thirdPartyAssistantMessages).toHaveLength(2)
+  expect(thirdPartyAssistantMessages[0]?.message?.content).toEqual([
+    { type: 'text', text: 'visible reply' },
+  ])
+  expect(
+    JSON.stringify(thirdPartyAssistantMessages.map(message => message.message?.content)),
+  ).not.toContain('secret reasoning')
+  expect(
+    JSON.stringify(thirdPartyAssistantMessages.map(message => message.message?.content)),
+  ).not.toContain('only hidden reasoning')
+
+  mock.restore()
+  mock.module('./model/providers.js', () => ({
+    getAPIProvider: () => 'bedrock',
+    isOpenAICompatibleProvider: (provider: string) =>
+      provider === 'openai' ||
+      provider === 'gemini' ||
+      provider === 'github' ||
+      provider === 'codex',
+  }))
+
+  const bedrockModule = await import(`./conversationRecovery.ts?provider=bedrock-${Date.now()}`)
+  const anthropicCompatible = bedrockModule.deserializeMessagesWithInterruptDetection(serializedMessages as never[])
+  const anthropicAssistantMessages = anthropicCompatible.messages.filter(
+    message => message.type === 'assistant',
+  )
+
+  expect(anthropicAssistantMessages).toHaveLength(2)
+  expect(anthropicAssistantMessages[0]?.message?.content).toEqual([
+    { type: 'thinking', thinking: 'secret reasoning' },
+    { type: 'text', text: 'visible reply' },
+  ])
+  expect(
+    JSON.stringify(anthropicAssistantMessages.map(message => message.message?.content)),
+  ).toContain('secret reasoning')
+  expect(
+    JSON.stringify(anthropicAssistantMessages.map(message => message.message?.content)),
+  ).not.toContain('only hidden reasoning')
+})

src/utils/conversationRecovery.test.ts

@@ -13,6 +13,7 @@ const originalSimple = process.env.CLAUDE_CODE_SIMPLE
 const sessionId = '00000000-0000-4000-8000-000000001999'
 const ts = '2026-04-02T00:00:00.000Z'
 
+
 function id(n: number): string {
   return `00000000-0000-4000-8000-${String(n).padStart(12, '0')}`
 }
@@ -76,4 +77,3 @@ test('loadConversationForResume rejects oversized reconstructed transcripts', as
     'Reconstructed transcript is too large to resume safely',
   )
 })
-

src/utils/conversationRecovery.ts

@@ -24,6 +24,7 @@ import {
   type FileHistorySnapshot,
 } from './fileHistory.js'
 import { logError } from './log.js'
+import { getAPIProvider } from './model/providers.js'
 import {
   createAssistantMessage,
   createUserMessage,
@@ -177,6 +178,25 @@ export type DeserializeResult = {
   turnInterruptionState: TurnInterruptionState
 }
 
+/**
+ * Remove thinking/redacted_thinking content blocks from assistant messages.
+ * Messages that become empty after stripping are removed entirely.
+ */
+function stripThinkingBlocks(messages: NormalizedMessage[]): NormalizedMessage[] {
+  return messages.reduce<NormalizedMessage[]>((acc, msg) => {
+    if (msg.type !== 'assistant' || !Array.isArray(msg.message?.content)) {
+      acc.push(msg)
+      return acc
+    }
+    const filtered = msg.message.content.filter(
+      (block: { type?: string }) => block.type !== 'thinking' && block.type !== 'redacted_thinking',
+    )
+    if (filtered.length === 0) return acc
+    acc.push({ ...msg, message: { ...msg.message, content: filtered } })
+    return acc
+  }, [])
+}
+
 /**
  * Deserializes messages from a log file into the format expected by the REPL.
  * Filters unresolved tool uses, orphaned thinking messages, and appends a
@@ -227,10 +247,19 @@ export function deserializeMessagesWithInterruptDetection(
       filteredToolUses,
     ) as NormalizedMessage[]
 
+    // Strip thinking/redacted_thinking content blocks from assistant messages
+    // when resuming against a 3P provider. These Anthropic-specific blocks cause
+    // 400 errors or context corruption on OpenAI-compatible providers (issue #248 finding 5).
+    const provider = getAPIProvider()
+    const isThirdPartyProvider = provider !== 'firstParty' && provider !== 'bedrock' && provider !== 'vertex' && provider !== 'foundry'
+    const thinkingStripped = isThirdPartyProvider
+      ? stripThinkingBlocks(filteredThinking)
+      : filteredThinking
+
     // Filter out assistant messages with only whitespace text content.
     // This can happen when model outputs "\n\n" before thinking, user cancels mid-stream.
     const filteredMessages = filterWhitespaceOnlyAssistantMessages(
-      filteredThinking,
+      thinkingStripped,
     ) as NormalizedMessage[]
 
     const internalState = detectTurnInterruption(filteredMessages)

src/utils/managedEnv.ts

@@ -8,7 +8,6 @@ import {
 } from './managedEnvConstants.js'
 import { clearMTLSCache } from './mtls.js'
 import { clearProxyCache, configureGlobalAgents } from './proxy.js'
-import { filterSettingsEnvForExplicitProvider } from './providerEnvSelection.js'
 import { applyActiveProviderProfileFromConfig } from './providerProfiles.js'
 import { isSettingSourceEnabled } from './settings/constants.js'
 import {
@@ -88,9 +87,7 @@ function filterSettingsEnv(
   env: Record<string, string> | undefined,
 ): Record<string, string> {
   return withoutCcdSpawnEnvKeys(
-    filterSettingsEnvForExplicitProvider(
     withoutHostManagedProviderVars(withoutSSHTunnelVars(env)),
-    ),
   )
 }
 

src/utils/model/openaiContextWindows.ts

@@ -44,6 +44,10 @@ const OPENAI_CONTEXT_WINDOWS: Record<string, number> = {
   'mistral-large-latest':     131_072,
   'mistral-small-latest':     131_072,
 
+  // MiniMax
+  'MiniMax-M2.7':             204_800,
+  'minimax-m2.7':             204_800,
+
   // Google (via OpenRouter)
   'google/gemini-2.0-flash':1_048_576,
   'google/gemini-2.5-pro':  1_048_576,
@@ -110,6 +114,10 @@ const OPENAI_MAX_OUTPUT_TOKENS: Record<string, number> = {
   'mistral-large-latest':     32_768,
   'mistral-small-latest':     32_768,
 
+  // MiniMax
+  'MiniMax-M2.7':            131_072,
+  'minimax-m2.7':            131_072,
+
   // Google (via OpenRouter)
   'google/gemini-2.0-flash':   8_192,
   'google/gemini-2.5-pro':    65_536,

src/utils/providerEnvSelection.test.ts

@@ -1,116 +0,0 @@
-import { afterEach, beforeEach, describe, expect, test } from 'bun:test'
-import { filterSettingsEnvForExplicitProvider } from './providerEnvSelection.js'
-
-const originalEnv = { ...process.env }
-
-const RESET_KEYS = [
-  'CLAUDE_CODE_EXPLICIT_PROVIDER',
-  'CLAUDE_CODE_USE_OPENAI',
-  'CLAUDE_CODE_USE_GEMINI',
-  'CLAUDE_CODE_USE_GITHUB',
-  'CLAUDE_CODE_USE_BEDROCK',
-  'CLAUDE_CODE_USE_VERTEX',
-  'CLAUDE_CODE_USE_FOUNDRY',
-] as const
-
-beforeEach(() => {
-  for (const key of RESET_KEYS) {
-    delete process.env[key]
-  }
-})
-
-afterEach(() => {
-  for (const key of RESET_KEYS) {
-    if (originalEnv[key] === undefined) delete process.env[key]
-    else process.env[key] = originalEnv[key]
-  }
-})
-
-describe('filterSettingsEnvForExplicitProvider', () => {
-  test('does not treat plain provider flags as an explicit CLI override', () => {
-    process.env.CLAUDE_CODE_USE_GITHUB = '1'
-
-    expect(
-      filterSettingsEnvForExplicitProvider({
-        CLAUDE_CODE_USE_OPENAI: '1',
-        OPENAI_MODEL: 'gpt-4o',
-        OTHER: 'keep-me',
-      }),
-    ).toEqual({
-      CLAUDE_CODE_USE_OPENAI: '1',
-      OPENAI_MODEL: 'gpt-4o',
-      OTHER: 'keep-me',
-    })
-  })
-
-  test('strips settings-sourced provider flags when CLI provider is explicit', () => {
-    process.env.CLAUDE_CODE_EXPLICIT_PROVIDER = 'openai'
-
-    expect(
-      filterSettingsEnvForExplicitProvider({
-        CLAUDE_CODE_USE_GITHUB: '1',
-        CLAUDE_CODE_USE_OPENAI: '1',
-        OTHER: 'keep-me',
-      }),
-    ).toEqual({ OTHER: 'keep-me' })
-  })
-
-  test('strips a stale GitHub model when explicit provider is not github', () => {
-    process.env.CLAUDE_CODE_EXPLICIT_PROVIDER = 'openai'
-
-    expect(
-      filterSettingsEnvForExplicitProvider({
-        OPENAI_MODEL: 'github:copilot',
-        OTHER: 'keep-me',
-      }),
-    ).toEqual({ OTHER: 'keep-me' })
-  })
-
-  test('keeps a normal OpenAI model when explicit provider is openai', () => {
-    process.env.CLAUDE_CODE_EXPLICIT_PROVIDER = 'openai'
-
-    expect(
-      filterSettingsEnvForExplicitProvider({
-        OPENAI_MODEL: 'gpt-4o',
-        OTHER: 'keep-me',
-      }),
-    ).toEqual({ OPENAI_MODEL: 'gpt-4o', OTHER: 'keep-me' })
-  })
-
-  test('strips a non-GitHub OpenAI model when explicit provider is github', () => {
-    process.env.CLAUDE_CODE_EXPLICIT_PROVIDER = 'github'
-
-    expect(
-      filterSettingsEnvForExplicitProvider({
-        OPENAI_MODEL: 'gpt-4o',
-        OTHER: 'keep-me',
-      }),
-    ).toEqual({ OTHER: 'keep-me' })
-  })
-
-  test('preserves anthropic startup intent by stripping stale GitHub/OpenAI settings', () => {
-    process.env.CLAUDE_CODE_EXPLICIT_PROVIDER = 'anthropic'
-
-    expect(
-      filterSettingsEnvForExplicitProvider({
-        CLAUDE_CODE_USE_GITHUB: '1',
-        CLAUDE_CODE_USE_OPENAI: '1',
-        OPENAI_MODEL: 'github:copilot',
-        OTHER: 'keep-me',
-      }),
-    ).toEqual({ OTHER: 'keep-me' })
-  })
-
-  test('preserves explicit ollama startup intent by stripping OpenAI routing settings', () => {
-    process.env.CLAUDE_CODE_EXPLICIT_PROVIDER = 'ollama'
-
-    expect(
-      filterSettingsEnvForExplicitProvider({
-        OPENAI_BASE_URL: 'https://api.openai.com/v1',
-        OPENAI_MODEL: 'gpt-4o',
-        OPENAI_API_KEY: 'sk-test',
-        OTHER: 'keep-me',
-      }),
-    ).toEqual({ OTHER: 'keep-me' })
-  })
-})

src/utils/providerEnvSelection.ts

@@ -1,63 +0,0 @@
-export const EXPLICIT_PROVIDER_ENV_VAR = 'CLAUDE_CODE_EXPLICIT_PROVIDER'
-
-const PROVIDER_FLAG_KEYS = [
-  'CLAUDE_CODE_USE_OPENAI',
-  'CLAUDE_CODE_USE_GEMINI',
-  'CLAUDE_CODE_USE_GITHUB',
-  'CLAUDE_CODE_USE_BEDROCK',
-  'CLAUDE_CODE_USE_VERTEX',
-  'CLAUDE_CODE_USE_FOUNDRY',
-] as const
-
-export function clearProviderSelectionFlags(
-  env: NodeJS.ProcessEnv = process.env,
-): void {
-  for (const key of PROVIDER_FLAG_KEYS) {
-    delete env[key]
-  }
-}
-
-function getExplicitProvider(processEnv: NodeJS.ProcessEnv): string | undefined {
-  return processEnv[EXPLICIT_PROVIDER_ENV_VAR]?.trim() || undefined
-}
-
-function isGithubModel(model: string | undefined): boolean {
-  return (model ?? '').trim().toLowerCase().startsWith('github:')
-}
-
-export function filterSettingsEnvForExplicitProvider(
-  env: Record<string, string> | undefined,
-  processEnv: NodeJS.ProcessEnv = process.env,
-): Record<string, string> {
-  if (!env) return {}
-
-  const explicitProvider = getExplicitProvider(processEnv)
-  if (!explicitProvider) {
-    return env
-  }
-
-  const filtered = { ...env }
-  for (const key of PROVIDER_FLAG_KEYS) {
-    delete filtered[key]
-  }
-
-  if (explicitProvider === 'ollama') {
-    delete filtered.OPENAI_BASE_URL
-    delete filtered.OPENAI_MODEL
-    delete filtered.OPENAI_API_KEY
-    return filtered
-  }
-
-  if (explicitProvider === 'github') {
-    if (!isGithubModel(filtered.OPENAI_MODEL)) {
-      delete filtered.OPENAI_MODEL
-    }
-    return filtered
-  }
-
-  if (isGithubModel(filtered.OPENAI_MODEL)) {
-    delete filtered.OPENAI_MODEL
-  }
-
-  return filtered
-}

src/utils/providerFlag.test.ts

@@ -9,13 +9,11 @@ import {
 const originalEnv = { ...process.env }
 
 const RESET_KEYS = [
-  'CLAUDE_CODE_EXPLICIT_PROVIDER',
   'CLAUDE_CODE_USE_OPENAI',
   'CLAUDE_CODE_USE_GEMINI',
   'CLAUDE_CODE_USE_GITHUB',
   'CLAUDE_CODE_USE_BEDROCK',
   'CLAUDE_CODE_USE_VERTEX',
-  'CLAUDE_CODE_USE_FOUNDRY',
   'OPENAI_BASE_URL',
   'OPENAI_API_KEY',
   'OPENAI_MODEL',
@@ -85,16 +83,6 @@ describe('applyProviderFlag - openai', () => {
     applyProviderFlag('openai', ['--model', 'gpt-4o'])
     expect(process.env.OPENAI_MODEL).toBe('gpt-4o')
   })
-
-  test('clears a previously persisted GitHub flag', () => {
-    process.env.CLAUDE_CODE_USE_GITHUB = '1'
-
-    const result = applyProviderFlag('openai', [])
-
-    expect(result.error).toBeUndefined()
-    expect(process.env.CLAUDE_CODE_USE_GITHUB).toBeUndefined()
-    expect(process.env.CLAUDE_CODE_USE_OPENAI).toBe('1')
-  })
 })
 
 describe('applyProviderFlag - gemini', () => {
@@ -116,16 +104,6 @@ describe('applyProviderFlag - github', () => {
     expect(result.error).toBeUndefined()
     expect(process.env.CLAUDE_CODE_USE_GITHUB).toBe('1')
   })
-
-  test('clears a previously set OpenAI flag', () => {
-    process.env.CLAUDE_CODE_USE_OPENAI = '1'
-
-    const result = applyProviderFlag('github', [])
-
-    expect(result.error).toBeUndefined()
-    expect(process.env.CLAUDE_CODE_USE_OPENAI).toBeUndefined()
-    expect(process.env.CLAUDE_CODE_USE_GITHUB).toBe('1')
-  })
 })
 
 describe('applyProviderFlag - bedrock', () => {
@@ -173,19 +151,6 @@ describe('applyProviderFlag - invalid provider', () => {
   })
 })
 
-describe('applyProviderFlag - anthropic', () => {
-  test('clears third-party provider flags', () => {
-    process.env.CLAUDE_CODE_USE_GITHUB = '1'
-    process.env.CLAUDE_CODE_USE_OPENAI = '1'
-
-    const result = applyProviderFlag('anthropic', [])
-
-    expect(result.error).toBeUndefined()
-    expect(process.env.CLAUDE_CODE_USE_GITHUB).toBeUndefined()
-    expect(process.env.CLAUDE_CODE_USE_OPENAI).toBeUndefined()
-  })
-})
-
 describe('applyProviderFlagFromArgs', () => {
   test('applies ollama provider and model from argv in one step', () => {
     const result = applyProviderFlagFromArgs([

src/utils/providerFlag.ts

@@ -1,8 +1,3 @@
-import {
-  clearProviderSelectionFlags,
-  EXPLICIT_PROVIDER_ENV_VAR,
-} from './providerEnvSelection.js'
-
 /**
  * --provider CLI flag support.
  *
@@ -82,9 +77,6 @@ export function applyProviderFlag(
     }
   }
 
-  clearProviderSelectionFlags()
-  process.env[EXPLICIT_PROVIDER_ENV_VAR] = provider
-
   const model = parseModelFlag(args)
 
   switch (provider as ProviderFlagName) {

src/utils/providerProfile.test.ts

@@ -485,26 +485,6 @@ test('buildStartupEnvFromProfile leaves explicit provider selections untouched',
   assert.equal(env.OPENAI_API_KEY, undefined)
 })
 
-test('buildStartupEnvFromProfile preserves explicit anthropic startup selection', async () => {
-  const processEnv = {
-    CLAUDE_CODE_EXPLICIT_PROVIDER: 'anthropic',
-  }
-
-  const env = await buildStartupEnvFromProfile({
-    persisted: profile('openai', {
-      CLAUDE_CODE_USE_GITHUB: '1',
-      OPENAI_MODEL: 'github:copilot',
-    }),
-    processEnv,
-  })
-
-  assert.equal(env, processEnv)
-  assert.equal(env.CLAUDE_CODE_EXPLICIT_PROVIDER, 'anthropic')
-  assert.equal(env.CLAUDE_CODE_USE_OPENAI, undefined)
-  assert.equal(env.CLAUDE_CODE_USE_GITHUB, undefined)
-  assert.equal(env.OPENAI_MODEL, undefined)
-})
-
 test('buildStartupEnvFromProfile leaves profile-managed env untouched', async () => {
   const processEnv = {
     CLAUDE_CODE_PROVIDER_PROFILE_ENV_APPLIED: '1',

src/utils/providerProfile.ts

@@ -412,10 +412,6 @@ export function hasExplicitProviderSelection(
     return true
   }
 
-  if (processEnv.CLAUDE_CODE_EXPLICIT_PROVIDER?.trim()) {
-    return true
-  }
-
   return (
     processEnv.CLAUDE_CODE_USE_OPENAI !== undefined ||
     processEnv.CLAUDE_CODE_USE_GITHUB !== undefined ||

src/utils/providerProfiles.test.ts

@@ -9,7 +9,6 @@ async function importFreshProvidersModule() {
 const originalEnv = { ...process.env }
 
 const RESTORED_KEYS = [
-  'CLAUDE_CODE_EXPLICIT_PROVIDER',
   'CLAUDE_CODE_PROVIDER_PROFILE_ENV_APPLIED',
   'CLAUDE_CODE_PROVIDER_PROFILE_ENV_APPLIED_ID',
   'CLAUDE_CODE_USE_OPENAI',
@@ -143,29 +142,6 @@ describe('applyProviderProfileToProcessEnv', () => {
 })
 
 describe('applyActiveProviderProfileFromConfig', () => {
-  test('does not override explicit anthropic startup selection', async () => {
-    const { applyActiveProviderProfileFromConfig } =
-      await importFreshProviderProfileModules()
-    process.env.CLAUDE_CODE_EXPLICIT_PROVIDER = 'anthropic'
-
-    const applied = applyActiveProviderProfileFromConfig({
-      providerProfiles: [
-        buildProfile({
-          id: 'saved_github',
-          baseUrl: 'https://api.githubcopilot.com',
-          model: 'github:copilot',
-        }),
-      ],
-      activeProviderProfileId: 'saved_github',
-    } as any)
-
-    expect(applied).toBeUndefined()
-    expect(process.env.CLAUDE_CODE_EXPLICIT_PROVIDER).toBe('anthropic')
-    expect(process.env.CLAUDE_CODE_USE_OPENAI).toBeUndefined()
-    expect(process.env.CLAUDE_CODE_USE_GITHUB).toBeUndefined()
-    expect(process.env.OPENAI_MODEL).toBeUndefined()
-  })
-
   test('does not override explicit startup provider selection', async () => {
     const { applyActiveProviderProfileFromConfig } =
       await importFreshProviderProfileModules()

src/utils/providerProfiles.ts

@@ -5,7 +5,6 @@ import {
   type ProviderProfile,
 } from './config.js'
 import type { ModelOption } from './model/modelOptions.js'
-import { EXPLICIT_PROVIDER_ENV_VAR } from './providerEnvSelection.js'
 
 export type ProviderPreset =
   | 'anthropic'
@@ -257,7 +256,6 @@ function hasProviderSelectionFlags(
   processEnv: NodeJS.ProcessEnv = process.env,
 ): boolean {
   return (
-    processEnv[EXPLICIT_PROVIDER_ENV_VAR] !== undefined ||
     processEnv.CLAUDE_CODE_USE_OPENAI !== undefined ||
     processEnv.CLAUDE_CODE_USE_GEMINI !== undefined ||
     processEnv.CLAUDE_CODE_USE_GITHUB !== undefined ||

src/utils/ripgrep.test.ts

@@ -1,11 +1,52 @@
 import { expect, test } from 'bun:test'
+import path from 'path'
 
-import { wrapRipgrepUnavailableError } from './ripgrep.ts'
+import { resolveRipgrepConfig, wrapRipgrepUnavailableError } from './ripgrep.js'
+
+const MOCK_BUILTIN_PATH = path.normalize(
+  process.platform === 'win32'
+    ? `vendor/ripgrep/${process.arch}-win32/rg.exe`
+    : `vendor/ripgrep/${process.arch}-${process.platform}/rg`,
+)
+
+test('ripgrepCommand falls back to system rg when builtin binary is missing', () => {
+  const config = resolveRipgrepConfig({
+    userWantsSystemRipgrep: false,
+    bundledMode: false,
+    builtinCommand: MOCK_BUILTIN_PATH,
+    builtinExists: false,
+    systemExecutablePath: '/usr/bin/rg',
+    processExecPath: '/fake/bun',
+  })
+
+  expect(config).toMatchObject({
+    mode: 'system',
+    command: 'rg',
+    args: [],
+  })
+})
+
+test('ripgrepCommand keeps builtin mode when bundled binary exists', () => {
+  const config = resolveRipgrepConfig({
+    userWantsSystemRipgrep: false,
+    bundledMode: false,
+    builtinCommand: MOCK_BUILTIN_PATH,
+    builtinExists: true,
+    systemExecutablePath: '/usr/bin/rg',
+    processExecPath: '/fake/bun',
+  })
+
+  expect(config).toMatchObject({
+    mode: 'builtin',
+    command: MOCK_BUILTIN_PATH,
+    args: [],
+  })
+})
 
 test('wrapRipgrepUnavailableError explains missing packaged fallback', () => {
   const error = wrapRipgrepUnavailableError(
     { code: 'ENOENT', message: 'spawn rg ENOENT' },
-    { mode: 'builtin', command: 'C:\\fake\\vendor\\ripgrep\\rg.exe' },
+    { mode: 'builtin', command: 'C:\\fake\\vendor\\ripgrep\\rg.exe', args: [] },
     'win32',
   )
 
@@ -18,7 +59,7 @@ test('wrapRipgrepUnavailableError explains missing packaged fallback', () => {
 test('wrapRipgrepUnavailableError explains missing system ripgrep', () => {
   const error = wrapRipgrepUnavailableError(
     { code: 'ENOENT', message: 'spawn rg ENOENT' },
-    { mode: 'system', command: 'rg' },
+    { mode: 'system', command: 'rg', args: [] },
     'linux',
   )
 

src/utils/ripgrep.ts

@@ -1,5 +1,6 @@
 import type { ChildProcess, ExecFileException } from 'child_process'
 import { execFile, spawn } from 'child_process'
+import { existsSync } from 'fs'
 import memoize from 'lodash-es/memoize.js'
 import { homedir } from 'os'
 import * as path from 'path'
@@ -30,40 +31,72 @@ type RipgrepConfig = {
 
 type RipgrepErrorLike = Pick<NodeJS.ErrnoException, 'code' | 'message'>
 
-const getRipgrepConfig = memoize((): RipgrepConfig => {
+function isErrnoException(error: unknown): error is NodeJS.ErrnoException {
-  const userWantsSystemRipgrep = isEnvDefinedFalsy(
+  return error instanceof Error
-    process.env.USE_BUILTIN_RIPGREP,
+}
-  )
 
-  // Try system ripgrep if user wants it
+type ResolveRipgrepConfigArgs = {
-  if (userWantsSystemRipgrep) {
+  userWantsSystemRipgrep: boolean
-    const { cmd: systemPath } = findExecutable('rg', [])
+  bundledMode: boolean
-    if (systemPath !== 'rg') {
+  builtinCommand: string
-      // SECURITY: Use command name 'rg' instead of systemPath to prevent PATH hijacking
+  builtinExists: boolean
-      // If we used systemPath, a malicious ./rg.exe in current directory could be executed
+  systemExecutablePath: string
-      // Using just 'rg' lets the OS resolve it safely with NoDefaultCurrentDirectoryInExePath protection
+  processExecPath?: string
+}
+
+export function resolveRipgrepConfig({
+  userWantsSystemRipgrep,
+  bundledMode,
+  builtinCommand,
+  builtinExists,
+  systemExecutablePath,
+  processExecPath = process.execPath,
+}: ResolveRipgrepConfigArgs): RipgrepConfig {
+  if (userWantsSystemRipgrep && systemExecutablePath !== 'rg') {
+    // SECURITY: Use command name 'rg' instead of systemExecutablePath to prevent PATH hijacking
     return { mode: 'system', command: 'rg', args: [] }
   }
-  }
 
-  // In bundled (native) mode, ripgrep is statically compiled into bun-internal
+  if (bundledMode) {
-  // and dispatches based on argv[0]. We spawn ourselves with argv0='rg'.
-  if (isInBundledMode()) {
     return {
       mode: 'embedded',
-      command: process.execPath,
+      command: processExecPath,
       args: ['--no-config'],
       argv0: 'rg',
     }
   }
 
+  if (builtinExists) {
+    return { mode: 'builtin', command: builtinCommand, args: [] }
+  }
+
+  if (systemExecutablePath !== 'rg') {
+    return { mode: 'system', command: 'rg', args: [] }
+  }
+
+  return { mode: 'builtin', command: builtinCommand, args: [] }
+}
+
+const getRipgrepConfig = memoize((): RipgrepConfig => {
+  const userWantsSystemRipgrep = isEnvDefinedFalsy(
+    process.env.USE_BUILTIN_RIPGREP,
+  )
+  const bundledMode = isInBundledMode()
   const rgRoot = path.resolve(__dirname, 'vendor', 'ripgrep')
-  const command =
+  const builtinCommand =
     process.platform === 'win32'
       ? path.resolve(rgRoot, `${process.arch}-win32`, 'rg.exe')
       : path.resolve(rgRoot, `${process.arch}-${process.platform}`, 'rg')
+  const builtinExists = existsSync(builtinCommand)
+  const { cmd: systemExecutablePath } = findExecutable('rg', [])
 
-  return { mode: 'builtin', command, args: [] }
+  return resolveRipgrepConfig({
+    userWantsSystemRipgrep,
+    bundledMode,
+    builtinCommand,
+    builtinExists,
+    systemExecutablePath,
+  })
 })
 
 export function ripgrepCommand(): {
@@ -324,7 +357,9 @@ async function ripGrepFileCount(
       if (settled) return
       settled = true
       reject(
-        err.code === 'ENOENT' ? wrapRipgrepUnavailableError(err) : err,
+        isErrnoException(err) && err.code === 'ENOENT'
+          ? wrapRipgrepUnavailableError(err)
+          : err,
       )
     })
   })
@@ -388,7 +423,9 @@ export async function ripGrepStream(
       if (settled) return
       settled = true
       reject(
-        err.code === 'ENOENT' ? wrapRipgrepUnavailableError(err) : err,
+        isErrnoException(err) && err.code === 'ENOENT'
+          ? wrapRipgrepUnavailableError(err)
+          : err,
       )
     })
   })
@@ -436,7 +473,9 @@ export async function ripGrep(
       const CRITICAL_ERROR_CODES = ['ENOENT', 'EACCES', 'EPERM']
       if (CRITICAL_ERROR_CODES.includes(error.code as string)) {
         reject(
-          error.code === 'ENOENT' ? wrapRipgrepUnavailableError(error) : error,
+          isErrnoException(error) && error.code === 'ENOENT'
+            ? wrapRipgrepUnavailableError(error)
+            : error,
         )
         return
       }

src/utils/schemaSanitizer.test.ts

@@ -0,0 +1,68 @@
+import { describe, expect, test } from 'bun:test'
+
+import { sanitizeSchemaForOpenAICompat } from './schemaSanitizer'
+
+describe('sanitizeSchemaForOpenAICompat', () => {
+  test('preserves Grep-like properties.pattern while keeping it required', () => {
+    const schema = {
+      type: 'object',
+      properties: {
+        pattern: {
+          type: 'string',
+          description: 'The regular expression pattern to search for in file contents',
+        },
+        path: { type: 'string' },
+        glob: { type: 'string' },
+      },
+      required: ['pattern'],
+    }
+
+    const sanitized = sanitizeSchemaForOpenAICompat(schema)
+    const properties = sanitized.properties as Record<string, unknown> | undefined
+
+    expect(Object.keys(properties ?? {})).toEqual(['pattern', 'path', 'glob'])
+    expect(properties?.pattern).toEqual({
+      type: 'string',
+      description: 'The regular expression pattern to search for in file contents',
+    })
+    expect(sanitized.required).toEqual(['pattern'])
+  })
+
+  test('preserves Glob-like properties.pattern while keeping it required', () => {
+    const schema = {
+      type: 'object',
+      properties: {
+        pattern: {
+          type: 'string',
+          description: 'The glob pattern to match files against',
+        },
+        path: { type: 'string' },
+      },
+      required: ['pattern'],
+    }
+
+    const sanitized = sanitizeSchemaForOpenAICompat(schema)
+    const properties = sanitized.properties as Record<string, unknown> | undefined
+
+    expect(Object.keys(properties ?? {})).toEqual(['pattern', 'path'])
+    expect(properties?.pattern).toEqual({
+      type: 'string',
+      description: 'The glob pattern to match files against',
+    })
+    expect(sanitized.required).toEqual(['pattern'])
+  })
+
+  test('strips JSON Schema validator pattern from string schemas', () => {
+    const schema = {
+      type: 'string',
+      pattern: '^[a-z]+$',
+      minLength: 1,
+    }
+
+    const sanitized = sanitizeSchemaForOpenAICompat(schema)
+
+    expect(sanitized).toEqual({
+      type: 'string',
+    })
+  })
+})

src/utils/schemaSanitizer.ts

@@ -33,6 +33,15 @@ function stripSchemaKeywords(schema: unknown, keywords: Set<string>): unknown {
 
   const result: Record<string, unknown> = {}
   for (const [key, value] of Object.entries(schema)) {
+    if (key === 'properties' && isSchemaRecord(value)) {
+      const sanitizedProps: Record<string, unknown> = {}
+      for (const [propName, propSchema] of Object.entries(value)) {
+        sanitizedProps[propName] = stripSchemaKeywords(propSchema, keywords)
+      }
+      result[key] = sanitizedProps
+      continue
+    }
+
     if (keywords.has(key)) {
       continue
     }
@@ -215,10 +224,13 @@ export function sanitizeSchemaForOpenAICompat(
     }
   }
 
-  if (Array.isArray(record.required) && isSchemaRecord(record.properties)) {
+  const properties = isSchemaRecord(record.properties)
+    ? record.properties
+    : undefined
+
+  if (Array.isArray(record.required) && properties) {
     record.required = record.required.filter(
-      (value): value is string =>
+      (value): value is string => typeof value === 'string' && value in properties,
-        typeof value === 'string' && value in record.properties,
     )
   }