coder · ibetitsmike · Aug 20, 2026 · Aug 20, 2026
diff --git a/cli/testdata/server-config.yaml.golden b/cli/testdata/server-config.yaml.golden
@@ -805,6 +805,10 @@ chat:
   # opt-in settings.
   # (default: false, type: bool)
   debugLoggingEnabled: false
+  # How long a chat model attempt may go without receiving a stream part before it
+  # is canceled and retried.
+  # (default: 5m, type: duration)
+  streamSilenceTimeout: 5m0s
   # HTTPS URL to receive chat agent lifecycle hook events (plain HTTP requires
   # --chat-hook-allow-insecure). Hooks are disabled when unset. Requires the
   # agent-lifecycle-hooks experiment.

diff --git a/coderd/apidoc/docs.go b/coderd/apidoc/docs.go
diff --git a/coderd/apidoc/swagger.json b/coderd/apidoc/swagger.json
diff --git a/coderd/coderd.go b/coderd/coderd.go
@@ -944,6 +944,7 @@ func New(options *Options) *API {
 				AllowBYOKSet:                   true,
 				AIBridgeTransportFactory:       &api.AIBridgeTransportFactory,
 				AlwaysEnableDebugLogs:          options.DeploymentValues.AI.Chat.DebugLoggingEnabled.Value(),
+				StreamSilenceTimeout:           options.DeploymentValues.AI.Chat.StreamSilenceTimeout.Value(),
 				Experiments:                    experiments,
 				AgentConn:                      api.agentProvider.AgentConn,
 				AgentInactiveDisconnectTimeout: api.AgentInactiveDisconnectTimeout,

diff --git a/coderd/x/chatd/chatd.go b/coderd/x/chatd/chatd.go
@@ -179,6 +179,7 @@ type Server struct {
 	agentInactiveDisconnectTimeout time.Duration
 	dialTimeout                    time.Duration
 	instructionLookupTimeout       time.Duration
+	streamSilenceTimeout           time.Duration
 	createWorkspaceFn              chattool.CreateWorkspaceFn
 	startWorkspaceFn               chattool.StartWorkspaceFn
 	stopWorkspaceFn                chattool.StopWorkspaceFn
@@ -3044,11 +3045,15 @@ type Config struct {
 	ReplicaID uuid.UUID
 	// StreamPartsDialer dials remote stream parts. Nil uses the local
 	// in-process channel dialer for every stream.
-	StreamPartsDialer              StreamPartsDialer
-	PendingChatAcquireInterval     time.Duration
-	MaxChatsPerAcquire             int32
-	InFlightChatStaleAfter         time.Duration
-	ChatHeartbeatInterval          time.Duration
+	StreamPartsDialer          StreamPartsDialer
+	PendingChatAcquireInterval time.Duration
+	MaxChatsPerAcquire         int32
+	InFlightChatStaleAfter     time.Duration
+	ChatHeartbeatInterval      time.Duration
+	// StreamSilenceTimeout bounds how long a model attempt may go
+	// without receiving a stream part before it is canceled and
+	// retried. Zero uses the chatloop default.
+	StreamSilenceTimeout           time.Duration
 	AgentConn                      AgentConnFunc
 	AgentInactiveDisconnectTimeout time.Duration
 	InstructionLookupTimeout       time.Duration
@@ -3146,6 +3151,7 @@ func New(ps pubsub.Pubsub, cfg Config) *Server {
 		agentInactiveDisconnectTimeout: cfg.AgentInactiveDisconnectTimeout,
 		dialTimeout:                    defaultDialTimeout,
 		instructionLookupTimeout:       instructionLookupTimeout,
+		streamSilenceTimeout:           cfg.StreamSilenceTimeout,
 		createWorkspaceFn:              cfg.CreateWorkspace,
 		startWorkspaceFn:               cfg.StartWorkspace,
 		stopWorkspaceFn:                cfg.StopWorkspace,

diff --git a/coderd/x/chatd/chatloop/chatloop.go b/coderd/x/chatd/chatloop/chatloop.go
@@ -35,8 +35,10 @@ import (
 const (
 	// defaultStreamSilenceTimeout bounds how long an individual
 	// model attempt may go without receiving a stream part before
-	// the attempt is canceled and retried.
-	defaultStreamSilenceTimeout = 10 * time.Minute
+	// the attempt is canceled and retried. Five minutes tolerates
+	// long provider thinking pauses while bounding how long a
+	// wedged provider stream can stall a turn.
+	defaultStreamSilenceTimeout = 5 * time.Minute
 	streamSilenceGuardTimerTag  = "streamSilenceGuard"
 )
 

diff --git a/coderd/x/chatd/generation.go b/coderd/x/chatd/generation.go
@@ -742,6 +742,7 @@ func (s *taskStarter) generateAssistant(
 		ProviderOptions:      prepared.ProviderOptions,
 		PublishMessagePart:   attempt.publish,
 		OnModelStreamStart:   attempt.startModelInvocation,
+		StreamSilenceTimeout: s.server.streamSilenceTimeout,
 		Logger:               s.opts.Logger,
 		Clock:                s.opts.Clock,
 		Metrics:              s.server.metrics,

diff --git a/codersdk/deployment.go b/codersdk/deployment.go
@@ -4354,6 +4354,18 @@ Write out the current server config as YAML to stdout.`,
 			Group:       &deploymentGroupChat,
 			YAML:        "debugLoggingEnabled",
 		},
+		{
+			Name:        "Chat: Stream Silence Timeout",
+			Description: "How long a chat model attempt may go without receiving a stream part before it is canceled and retried.",
+			Flag:        "chat-stream-silence-timeout",
+			Env:         "CODER_CHAT_STREAM_SILENCE_TIMEOUT",
+			Value:       &c.AI.Chat.StreamSilenceTimeout,
+			Default:     "5m",
+			Group:       &deploymentGroupChat,
+			YAML:        "streamSilenceTimeout",
+			Hidden:      true, // Hidden because most operators should not need to modify this.
+			Annotations: serpent.Annotations{}.Mark(annotationFormatDuration, "true"),
+		},
 		{
 			Name:        "Chat: Hook URL",
 			Description: "HTTPS URL to receive chat agent lifecycle hook events (plain HTTP requires --chat-hook-allow-insecure). Hooks are disabled when unset. Requires the agent-lifecycle-hooks experiment.",
@@ -5092,13 +5104,14 @@ type AIBridgeProxyConfig struct {
 }
 
 type ChatConfig struct {
-	AcquireBatchSize    serpent.Int64    `json:"acquire_batch_size" typescript:",notnull"`
-	DebugLoggingEnabled serpent.Bool     `json:"debug_logging_enabled" typescript:",notnull"`
-	HookURL             serpent.URL      `json:"hook_url" typescript:",notnull"`
-	HookSecret          serpent.String   `json:"hook_secret" typescript:",notnull"`
-	HookTimeout         serpent.Duration `json:"hook_timeout" typescript:",notnull"`
-	HookEnabled         serpent.Bool     `json:"hook_enabled" typescript:",notnull"`
-	HookAllowInsecure   serpent.Bool     `json:"hook_allow_insecure" typescript:",notnull"`
+	AcquireBatchSize     serpent.Int64    `json:"acquire_batch_size" typescript:",notnull"`
+	DebugLoggingEnabled  serpent.Bool     `json:"debug_logging_enabled" typescript:",notnull"`
+	StreamSilenceTimeout serpent.Duration `json:"stream_silence_timeout" typescript:",notnull"`
+	HookURL              serpent.URL      `json:"hook_url" typescript:",notnull"`
+	HookSecret           serpent.String   `json:"hook_secret" typescript:",notnull"`
+	HookTimeout          serpent.Duration `json:"hook_timeout" typescript:",notnull"`
+	HookEnabled          serpent.Bool     `json:"hook_enabled" typescript:",notnull"`
+	HookAllowInsecure    serpent.Bool     `json:"hook_allow_insecure" typescript:",notnull"`
 	// Deprecated: AI Gateway routing is now the only routing path. Setting this
 	// value has no effect. This option will be removed in a future release.
 	AIGatewayRoutingEnabled serpent.Bool `json:"ai_gateway_routing_enabled" typescript:",notnull" swaggerignore:"true"`

diff --git a/docs/reference/api/general.md b/docs/reference/api/general.md
diff --git a/docs/reference/api/schemas.md b/docs/reference/api/schemas.md
diff --git a/site/src/api/typesGenerated.ts b/site/src/api/typesGenerated.ts