coder · ssncferreira · Aug 27, 2026 · Sep 11, 2026 · Sep 11, 2026
diff --git a/aibridge/bridge_test.go b/aibridge/bridge_test.go
@@ -14,6 +14,7 @@ import (
 	"github.com/stretchr/testify/require"
 	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/trace"
+	"golang.org/x/xerrors"
 
 	"cdr.dev/slog/v3/sloggers/slogtest"
 	"github.com/coder/coder/v2/aibridge"
@@ -248,21 +249,13 @@ func TestPassthroughRoutesForProviders(t *testing.T) {
 			expectPath: "/v1/models",
 		},
 		{
-			name:        "copilot_ping",
-			requestPath: "/copilot/_ping",
-			provider: func(_ *testing.T, baseURL string) provider.Provider {
-				return aibridge.NewCopilotProvider(config.Copilot{BaseURL: baseURL})
-			},
-			expectPath: "/_ping",
-		},
-		{
-			name:          "copilot_auto",
+			name:          "copilot_unknown_route",
 			requestMethod: http.MethodPost,
-			requestPath:   "/copilot/auto",
+			requestPath:   "/copilot/future/endpoint",
 			provider: func(_ *testing.T, baseURL string) provider.Provider {
 				return aibridge.NewCopilotProvider(config.Copilot{BaseURL: baseURL})
 			},
-			expectPath: "/auto",
+			expectPath: "/future/endpoint",
 		},
 	}
 
@@ -294,6 +287,46 @@ func TestPassthroughRoutesForProviders(t *testing.T) {
 	}
 }
 
+func TestBridgedRouteTakesPrecedenceOverPassthroughCatchAll(t *testing.T) {
+	t.Parallel()
+
+	upstreamCalled := false
+	interceptorCalled := false
+	upstream := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+		upstreamCalled = true
+		w.WriteHeader(http.StatusOK)
+	}))
+	t.Cleanup(upstream.Close)
+
+	// Given: a provider with a bridged route and a passthrough catch-all.
+	prov := &testutil.MockProvider{
+		NameStr:     "test",
+		URL:         upstream.URL,
+		Bridged:     []string{"/responses"},
+		Passthrough: []string{"/"},
+		InterceptorFunc: func(http.ResponseWriter, *http.Request, trace.Tracer) (intercept.Interceptor, error) {
+			interceptorCalled = true
+			return nil, xerrors.New("test interceptor error")
+		},
+	}
+	bridge, err := aibridge.NewRequestBridge(
+		t.Context(),
+		[]provider.Provider{prov},
+		nil, nil, slogtest.Make(t, nil), nil, bridgeTestTracer,
+	)
+	require.NoError(t, err)
+
+	// When: a request targets the bridged route.
+	req := httptest.NewRequest(http.MethodPost, "/test/responses", nil)
+	resp := httptest.NewRecorder()
+	bridge.ServeHTTP(resp, req)
+
+	// Then: the interceptor handles it, not the passthrough upstream.
+	assert.Equal(t, http.StatusInternalServerError, resp.Code)
+	assert.True(t, interceptorCalled)
+	assert.False(t, upstreamCalled)
+}
+
 func TestWebSocketUpgradeRejected(t *testing.T) {
 	t.Parallel()
 

diff --git a/aibridge/provider/copilot.go b/aibridge/provider/copilot.go
@@ -89,16 +89,11 @@ func (*Copilot) BridgedRoutes() []string {
 	}
 }
 
+// PassthroughRoutes allows all non-bridged routes because Copilot is always
+// BYOK. The upstream enforces the user's permissions, so an allowlist is not
+// needed to prevent access to privileged operations using shared credentials.
 func (*Copilot) PassthroughRoutes() []string {
-	return []string{
-		"/_ping",
-		"/auto",
-		"/models",
-		"/models/",
-		"/agents/",
-		"/mcp/",
-		"/.well-known/",
-	}
+	return []string{"/"}
 }
 
 func (*Copilot) AuthHeader() string {

diff --git a/aibridge/provider/provider.go b/aibridge/provider/provider.go
@@ -75,8 +75,9 @@ type Provider interface {
 	// BridgedRoutes returns a slice of [http.ServeMux]-compatible routes which will have special handling.
 	// See https://pkg.go.dev/net/http#hdr-Patterns-ServeMux.
 	BridgedRoutes() []string
-	// PassthroughRoutes returns a slice of whitelisted [http.ServeMux]-compatible* routes which are
-	// not currently intercepted and must be handled by the upstream directly.
+	// PassthroughRoutes returns a slice of [http.ServeMux]-compatible* routes which are
+	// not currently intercepted and must be handled by the upstream directly. Providers
+	// using centralized credentials should restrict these routes to known-safe operations.
 	//
 	// * only path routes can be specified, not ones containing HTTP methods. (i.e. GET /route).
 	// By default, these passthrough routes will accept any HTTP method.

diff --git a/docs/ai-coder/ai-gateway/reference.md b/docs/ai-coder/ai-gateway/reference.md
@@ -112,12 +112,7 @@ The Anthropic provider also serves the AWS Bedrock provider type.
 
 #### Passthrough
 
-- `/models(/*)`
-- `/agents/*`
-- `/mcp/*`
-- `/.well-known/*`
-
-Any route that is not listed above returns `404`.
+All Copilot routes other than the intercepted routes listed above pass through to the configured upstream provider.
 
 ## Troubleshooting