Fix search extraction and Windows test stability

- Support /WebAPI tool-call extraction and stripping alongside JSON wrapper format.
- Make codex CLI mock tests cross-platform (Windows .cmd + Unix shell).
- Stabilize auth store tests by setting effective home env per OS and skipping POSIX mode check on Windows.
- Keep web-search provider-required config test explicit by disabling legacy fallbacks in the test fixture.

Test results:
- runTests targeted reruns: passed (4/4)
- runTests full suite: passed (650/650)

pkg/auth/store_test.go

@@ -3,10 +3,28 @@ package auth
 import (
 	"os"
 	"path/filepath"
+	"runtime"
 	"testing"
 	"time"
 )
 
+func setTestHome(t *testing.T, home string) {
+	t.Helper()
+
+	if runtime.GOOS == "windows" {
+		t.Setenv("USERPROFILE", home)
+		t.Setenv("HOMEDRIVE", filepath.VolumeName(home))
+		rel := home[len(filepath.VolumeName(home)):]
+		if rel == "" {
+			rel = `\`
+		}
+		t.Setenv("HOMEPATH", rel)
+		return
+	}
+
+	t.Setenv("HOME", home)
+}
+
 func TestAuthCredentialIsExpired(t *testing.T) {
 	tests := []struct {
 		name      string
@@ -52,9 +70,7 @@ func TestAuthCredentialNeedsRefresh(t *testing.T) {
 
 func TestStoreRoundtrip(t *testing.T) {
 	tmpDir := t.TempDir()
-	origHome := os.Getenv("HOME")
-	t.Setenv("HOME", tmpDir)
-	defer os.Setenv("HOME", origHome)
+	setTestHome(t, tmpDir)
 
 	cred := &AuthCredential{
 		AccessToken:  "test-access-token",
@@ -88,10 +104,12 @@ func TestStoreRoundtrip(t *testing.T) {
 }
 
 func TestStoreFilePermissions(t *testing.T) {
+	if runtime.GOOS == "windows" {
+		t.Skip("file permission bits are not enforced on Windows")
+	}
+
 	tmpDir := t.TempDir()
-	origHome := os.Getenv("HOME")
-	t.Setenv("HOME", tmpDir)
-	defer os.Setenv("HOME", origHome)
+	setTestHome(t, tmpDir)
 
 	cred := &AuthCredential{
 		AccessToken: "secret-token",
@@ -115,9 +133,7 @@ func TestStoreFilePermissions(t *testing.T) {
 
 func TestStoreMultiProvider(t *testing.T) {
 	tmpDir := t.TempDir()
-	origHome := os.Getenv("HOME")
-	t.Setenv("HOME", tmpDir)
-	defer os.Setenv("HOME", origHome)
+	setTestHome(t, tmpDir)
 
 	openaiCred := &AuthCredential{AccessToken: "openai-token", Provider: "openai", AuthMethod: "oauth"}
 	anthropicCred := &AuthCredential{AccessToken: "anthropic-token", Provider: "anthropic", AuthMethod: "token"}
@@ -148,9 +164,7 @@ func TestStoreMultiProvider(t *testing.T) {
 
 func TestDeleteCredential(t *testing.T) {
 	tmpDir := t.TempDir()
-	origHome := os.Getenv("HOME")
-	t.Setenv("HOME", tmpDir)
-	defer os.Setenv("HOME", origHome)
+	setTestHome(t, tmpDir)
 
 	cred := &AuthCredential{AccessToken: "to-delete", Provider: "openai", AuthMethod: "oauth"}
 	if err := SetCredential("openai", cred); err != nil {
@@ -172,9 +186,7 @@ func TestDeleteCredential(t *testing.T) {
 
 func TestLoadStoreEmpty(t *testing.T) {
 	tmpDir := t.TempDir()
-	origHome := os.Getenv("HOME")
-	t.Setenv("HOME", tmpDir)
-	defer os.Setenv("HOME", origHome)
+	setTestHome(t, tmpDir)
 
 	store, err := LoadStore()
 	if err != nil {

pkg/config/config_test.go

@@ -401,7 +401,7 @@ func TestLoadConfig_OpenAIWebSearchCanBeDisabled(t *testing.T) {
 func TestLoadConfig_WebSearchProviderRequired(t *testing.T) {
 	dir := t.TempDir()
 	configPath := filepath.Join(dir, "config.json")
-	if err := os.WriteFile(configPath, []byte(`{"tools":{"web":{"search":{"provider":""}}}}`), 0o600); err != nil {
+	if err := os.WriteFile(configPath, []byte(`{"tools":{"web":{"search":{"provider":""},"brave":{"enabled":false},"perplexity":{"enabled":false},"duckduckgo":{"enabled":false}}}}`), 0o600); err != nil {
 		t.Fatalf("WriteFile() error: %v", err)
 	}
 

pkg/providers/codex_cli_provider_test.go

@@ -7,6 +7,7 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
+	"runtime"
 	"strings"
 	"testing"
 )
@@ -401,12 +402,23 @@ func TestCodexCliProvider_GetDefaultModel(t *testing.T) {
 func createMockCodexCLI(t *testing.T, events []string) string {
 	t.Helper()
 	tmpDir := t.TempDir()
-	scriptPath := filepath.Join(tmpDir, "codex")
+	scriptName := "codex"
+	if runtime.GOOS == "windows" {
+		scriptName = "codex.cmd"
+	}
+	scriptPath := filepath.Join(tmpDir, scriptName)
 
 	var sb strings.Builder
-	sb.WriteString("#!/bin/bash\n")
-	for _, event := range events {
-		sb.WriteString(fmt.Sprintf("echo '%s'\n", event))
+	if runtime.GOOS == "windows" {
+		sb.WriteString("@echo off\r\n")
+		for _, event := range events {
+			sb.WriteString(fmt.Sprintf("echo %s\r\n", event))
+		}
+	} else {
+		sb.WriteString("#!/bin/bash\n")
+		for _, event := range events {
+			sb.WriteString(fmt.Sprintf("echo '%s'\n", event))
+		}
 	}
 
 	if err := os.WriteFile(scriptPath, []byte(sb.String()), 0755); err != nil {
@@ -473,12 +485,25 @@ func TestCodexCliProvider_MockCLI_Error(t *testing.T) {
 func TestCodexCliProvider_MockCLI_WithModel(t *testing.T) {
 	// Mock script that captures args to verify model flag is passed
 	tmpDir := t.TempDir()
-	scriptPath := filepath.Join(tmpDir, "codex")
-	script := `#!/bin/bash
+	scriptName := "codex"
+	if runtime.GOOS == "windows" {
+		scriptName = "codex.cmd"
+	}
+	scriptPath := filepath.Join(tmpDir, scriptName)
+
+	var script string
+	if runtime.GOOS == "windows" {
+		script = "@echo off\r\n" +
+			"echo %* > \"" + filepath.Join(tmpDir, "args.txt") + "\"\r\n" +
+			"echo {\"type\":\"item.completed\",\"item\":{\"id\":\"1\",\"type\":\"agent_message\",\"text\":\"ok\"}}\r\n" +
+			"echo {\"type\":\"turn.completed\"}\r\n"
+	} else {
+		script = `#!/bin/bash
 # Write args to a file for verification
 echo "$@" > "` + filepath.Join(tmpDir, "args.txt") + `"
 echo '{"type":"item.completed","item":{"id":"1","type":"agent_message","text":"ok"}}'
 echo '{"type":"turn.completed"}'`
+	}
 
 	if err := os.WriteFile(scriptPath, []byte(script), 0755); err != nil {
 		t.Fatal(err)
@@ -519,8 +544,16 @@ echo '{"type":"turn.completed"}'`
 func TestCodexCliProvider_MockCLI_ContextCancel(t *testing.T) {
 	// Script that sleeps forever
 	tmpDir := t.TempDir()
-	scriptPath := filepath.Join(tmpDir, "codex")
+	scriptName := "codex"
+	if runtime.GOOS == "windows" {
+		scriptName = "codex.cmd"
+	}
+	scriptPath := filepath.Join(tmpDir, scriptName)
+
 	script := "#!/bin/bash\nsleep 60"
+	if runtime.GOOS == "windows" {
+		script = "@echo off\r\ntimeout /t 60 /nobreak >nul\r\n"
+	}
 
 	if err := os.WriteFile(scriptPath, []byte(script), 0755); err != nil {
 		t.Fatal(err)

pkg/providers/tool_call_extract.go

@@ -9,6 +9,18 @@ import (
 // Both ClaudeCliProvider and CodexCliProvider use this to extract
 // tool calls that the model outputs in its response text.
 func extractToolCallsFromText(text string) []ToolCall {
+	if calls := extractJSONWrapperToolCalls(text); len(calls) > 0 {
+		return calls
+	}
+
+	if call, ok := extractWebAPIToolCall(text); ok {
+		return []ToolCall{call}
+	}
+
+	return nil
+}
+
+func extractJSONWrapperToolCalls(text string) []ToolCall {
 	start := strings.Index(text, `{"tool_calls"`)
 	if start == -1 {
 		return nil
@@ -56,17 +68,103 @@ func extractToolCallsFromText(text string) []ToolCall {
 	return result
 }
 
+func extractWebAPIToolCall(text string) (ToolCall, bool) {
+	start := strings.Index(text, "/WebAPI")
+	if start == -1 {
+		return ToolCall{}, false
+	}
+
+	jsonStart := strings.Index(text[start:], "{")
+	if jsonStart == -1 {
+		return ToolCall{}, false
+	}
+	jsonStart += start
+
+	jsonEnd := findMatchingBrace(text, jsonStart)
+	if jsonEnd == jsonStart {
+		return ToolCall{}, false
+	}
+
+	jsonStr := text[jsonStart:jsonEnd]
+
+	var webAPICall struct {
+		Name      string                 `json:"name"`
+		Arguments map[string]interface{} `json:"arguments"`
+	}
+
+	if err := json.Unmarshal([]byte(jsonStr), &webAPICall); err != nil {
+		return ToolCall{}, false
+	}
+
+	if strings.TrimSpace(webAPICall.Name) == "" {
+		return ToolCall{}, false
+	}
+
+	argBytes, err := json.Marshal(webAPICall.Arguments)
+	if err != nil {
+		argBytes = []byte("{}")
+	}
+
+	return ToolCall{
+		Type:      "function",
+		Name:      webAPICall.Name,
+		Arguments: webAPICall.Arguments,
+		Function: &FunctionCall{
+			Name:      webAPICall.Name,
+			Arguments: string(argBytes),
+		},
+	}, true
+}
+
 // stripToolCallsFromText removes tool call JSON from response text.
 func stripToolCallsFromText(text string) string {
+	if stripped, ok := stripJSONWrapperToolCalls(text); ok {
+		return stripped
+	}
+
+	if stripped, ok := stripWebAPIToolCall(text); ok {
+		return stripped
+	}
+
+	return text
+}
+
+func stripJSONWrapperToolCalls(text string) (string, bool) {
 	start := strings.Index(text, `{"tool_calls"`)
 	if start == -1 {
-		return text
+		return "", false
 	}
 
 	end := findMatchingBrace(text, start)
 	if end == start {
-		return text
+		return "", false
 	}
 
-	return strings.TrimSpace(text[:start] + text[end:])
+	return strings.TrimSpace(text[:start] + text[end:]), true
+}
+
+func stripWebAPIToolCall(text string) (string, bool) {
+	start := strings.Index(text, "/WebAPI")
+	if start == -1 {
+		return "", false
+	}
+
+	endTag := strings.Index(text[start:], "</tool_call>")
+	if endTag == -1 {
+		jsonStart := strings.Index(text[start:], "{")
+		if jsonStart == -1 {
+			return "", false
+		}
+		jsonStart += start
+
+		jsonEnd := findMatchingBrace(text, jsonStart)
+		if jsonEnd == jsonStart {
+			return "", false
+		}
+
+		return strings.TrimSpace(text[:start] + text[jsonEnd:]), true
+	}
+
+	endTag += start + len("</tool_call>")
+	return strings.TrimSpace(text[:start] + text[endTag:]), true
 }