diff --git a/README.md b/README.md
index 81b9bf5..fe69759 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,6 @@ cp config.example.yaml config.yaml
 Edit `config.yaml`:
 - `api_keys` — key(s) your clients use to authenticate with the proxy
 - `claude_credentials` — path to your Claude credentials file
-- `auth_dir` — optional, directory with additional OAuth credential JSON files
 - `claude_binary` — path to `claude` binary (used on startup to capture request fingerprint)
 
 ## Build and run
diff --git a/internal/auth/selector.go b/internal/auth/selector.go
index 9e78d96..19c99a4 100644
--- a/internal/auth/selector.go
+++ b/internal/auth/selector.go
@@ -48,9 +48,7 @@ func (p *Pool) MarkFailure(cred *Credential, statusCode int) {
 }
 
 func (p *Pool) MarkSuccess(cred *Credential) {
-	cred.mu.Lock()
-	defer cred.mu.Unlock()
-	cred.CooldownUntil = time.Time{}
+	cred.ClearCooldown()
 }
 
 func (p *Pool) RefreshExpiring(ctx context.Context) {
diff --git a/internal/auth/types.go b/internal/auth/types.go
index 1b857d4..adf12a4 100644
--- a/internal/auth/types.go
+++ b/internal/auth/types.go
@@ -7,22 +7,15 @@ import (
 
 // Credential represents an Anthropic API credential loaded from a JSON file.
 type Credential struct {
-	ID                string
-	Email             string
-	AccessToken       string
-	RefreshToken      string
-	ExpiresAt         time.Time
-	FilePath          string
-	CooldownUntil     time.Time
-	nextRefreshAfter  time.Time
-	mu                sync.Mutex
-}
-
-// IsExpired returns true if the credential's access token has expired.
-func (c *Credential) IsExpired() bool {
-	c.mu.Lock()
-	defer c.mu.Unlock()
-	return time.Now().After(c.ExpiresAt)
+	ID               string
+	Email            string
+	AccessToken      string
+	RefreshToken     string
+	ExpiresAt        time.Time
+	FilePath         string
+	CooldownUntil    time.Time
+	nextRefreshAfter time.Time
+	mu               sync.Mutex
 }
 
 // IsOnCooldown returns true if the credential is currently on cooldown.
@@ -39,6 +32,13 @@ func (c *Credential) SetCooldown(duration time.Duration) {
 	c.CooldownUntil = time.Now().Add(duration)
 }
 
+// ClearCooldown removes any active cooldown on the credential.
+func (c *Credential) ClearCooldown() {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	c.CooldownUntil = time.Time{}
+}
+
 // Token returns the current access token.
 func (c *Credential) Token() string {
 	c.mu.Lock()
diff --git a/internal/proxy/sniff.go b/internal/proxy/sniff.go
index c29b304..20d0a8f 100644
--- a/internal/proxy/sniff.go
+++ b/internal/proxy/sniff.go
@@ -10,8 +10,6 @@ import (
 	"strings"
 	"sync"
 	"time"
-
-	"github.com/tidwall/gjson"
 )
 
 // SniffedProfile holds everything captured from a real Claude Code request.
@@ -124,18 +122,15 @@ func SniffClaudeCode(claudeBinary string) (*SniffedProfile, error) {
 }
 
 func extractProfile(r *http.Request, body []byte) *SniffedProfile {
-	// Capture raw headers preserving original casing and order.
+	// Capture raw headers preserving original casing.
 	var headers [][2]string
-	for i := 0; i < len(r.Header); i++ {
-		for name, vals := range r.Header {
-			if skipHeaders[strings.ToLower(name)] {
-				continue
-			}
-			for _, v := range vals {
-				headers = append(headers, [2]string{name, v})
-			}
+	for name, vals := range r.Header {
+		if skipHeaders[strings.ToLower(name)] {
+			continue
+		}
+		for _, v := range vals {
+			headers = append(headers, [2]string{name, v})
 		}
-		break
 	}
 
 	// Deduplicate and strip subscription-specific betas.
@@ -170,21 +165,6 @@ func extractProfile(r *http.Request, body []byte) *SniffedProfile {
 		}
 	}
 
-	// Extract the system prompt template from the body (everything except the billing header block).
-	// The billing header is the first system block starting with "x-anthropic-billing-header:".
-	systemBlocks := gjson.GetBytes(body, "system")
-	var templateSystem []string
-	if systemBlocks.IsArray() {
-		for _, block := range systemBlocks.Array() {
-			text := block.Get("text").String()
-			if strings.HasPrefix(text, "x-anthropic-billing-header:") {
-				continue
-			}
-			templateSystem = append(templateSystem, block.Raw)
-		}
-	}
-	_ = templateSystem // stored in body for now
-
 	return &SniffedProfile{
 		Headers: deduped,
 		Body:    body,
diff --git a/internal/server/server.go b/internal/server/server.go
index ebfd08b..a4ee0f2 100644
--- a/internal/server/server.go
+++ b/internal/server/server.go
@@ -7,7 +7,6 @@ import (
 	"net/http"
 	"strings"
 	"sync/atomic"
-	"time"
 
 	"github.com/gin-gonic/gin"
 
@@ -47,7 +46,6 @@ func New(cfg *config.Config, pool *auth.Pool, profile *proxy.SniffedProfile) *Se
 
 	engine.POST("/reload", s.handleReload())
 	engine.POST("/debug/refresh", handleDebugRefresh(pool))
-	engine.POST("/debug/shutdown", handleDebugShutdown(s))
 	engine.GET("/healthz", func(c *gin.Context) {
 		c.JSON(http.StatusOK, gin.H{"status": "ok"})
 	})
@@ -100,19 +98,6 @@ func (s *Server) handleReload() gin.HandlerFunc {
 	}
 }
 
-func handleDebugShutdown(s *Server) gin.HandlerFunc {
-	return func(c *gin.Context) {
-		c.JSON(http.StatusOK, gin.H{"status": "shutting down"})
-		go func() {
-			ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
-			defer cancel()
-			if err := s.Shutdown(ctx); err != nil {
-				log.Printf("shutdown error: %v", err)
-			}
-		}()
-	}
-}
-
 func handleDebugRefresh(pool *auth.Pool) gin.HandlerFunc {
 	return func(c *gin.Context) {
 		results := pool.RefreshAll(c.Request.Context())
@@ -146,7 +131,7 @@ func corsMiddleware() gin.HandlerFunc {
 func (s *Server) authMiddleware() gin.HandlerFunc {
 	return func(c *gin.Context) {
 		path := c.Request.URL.Path
-		if path == "/healthz" || path == "/reload" || strings.HasPrefix(path, "/debug/") {
+		if path == "/healthz" || path == "/reload" {
 			c.Next()
 			return
 		}