diff --git a/.env.example b/.env.example
index 4d8f7de..687281a 100644
--- a/.env.example
+++ b/.env.example
@@ -17,6 +17,14 @@ MINI_APP_ALLOWED_ORIGINS=http://localhost:5173
 # Parsing / AI
 OPENAI_API_KEY=your-openai-api-key
 PARSER_MODEL=gpt-4.1-mini
+PURCHASE_PARSER_MODEL=gpt-5-mini
+ASSISTANT_MODEL=gpt-5-mini
+ASSISTANT_TIMEOUT_MS=15000
+ASSISTANT_MEMORY_MAX_TURNS=12
+ASSISTANT_RATE_LIMIT_BURST=5
+ASSISTANT_RATE_LIMIT_BURST_WINDOW_MS=60000
+ASSISTANT_RATE_LIMIT_ROLLING=50
+ASSISTANT_RATE_LIMIT_ROLLING_WINDOW_MS=86400000
 
 # Scheduler
 SCHEDULER_SHARED_SECRET=your-scheduler-shared-secret
diff --git a/infra/terraform/README.md b/infra/terraform/README.md
index d6de3bb..62df321 100644
--- a/infra/terraform/README.md
+++ b/infra/terraform/README.md
@@ -73,6 +73,15 @@ Recommended approach:
 - Keep `project_id` separate for dev/prod when possible
 - Keep non-secret bot config in `*.tfvars`:
   - optional `bot_parser_model`
+  - optional `bot_purchase_parser_model`
+  - optional `bot_assistant_model`
+  - optional assistant runtime knobs:
+    `bot_assistant_timeout_ms`,
+    `bot_assistant_memory_max_turns`,
+    `bot_assistant_rate_limit_burst`,
+    `bot_assistant_rate_limit_burst_window_ms`,
+    `bot_assistant_rate_limit_rolling`,
+    `bot_assistant_rate_limit_rolling_window_ms`
   - optional `bot_mini_app_allowed_origins`
 
 ## CI validation
diff --git a/infra/terraform/main.tf b/infra/terraform/main.tf
index ab28a37..52492e3 100644
--- a/infra/terraform/main.tf
+++ b/infra/terraform/main.tf
@@ -93,6 +93,30 @@ module "bot_api_service" {
     var.bot_parser_model == null ? {} : {
       PARSER_MODEL = var.bot_parser_model
     },
+    var.bot_purchase_parser_model == null ? {} : {
+      PURCHASE_PARSER_MODEL = var.bot_purchase_parser_model
+    },
+    var.bot_assistant_model == null ? {} : {
+      ASSISTANT_MODEL = var.bot_assistant_model
+    },
+    var.bot_assistant_timeout_ms == null ? {} : {
+      ASSISTANT_TIMEOUT_MS = tostring(var.bot_assistant_timeout_ms)
+    },
+    var.bot_assistant_memory_max_turns == null ? {} : {
+      ASSISTANT_MEMORY_MAX_TURNS = tostring(var.bot_assistant_memory_max_turns)
+    },
+    var.bot_assistant_rate_limit_burst == null ? {} : {
+      ASSISTANT_RATE_LIMIT_BURST = tostring(var.bot_assistant_rate_limit_burst)
+    },
+    var.bot_assistant_rate_limit_burst_window_ms == null ? {} : {
+      ASSISTANT_RATE_LIMIT_BURST_WINDOW_MS = tostring(var.bot_assistant_rate_limit_burst_window_ms)
+    },
+    var.bot_assistant_rate_limit_rolling == null ? {} : {
+      ASSISTANT_RATE_LIMIT_ROLLING = tostring(var.bot_assistant_rate_limit_rolling)
+    },
+    var.bot_assistant_rate_limit_rolling_window_ms == null ? {} : {
+      ASSISTANT_RATE_LIMIT_ROLLING_WINDOW_MS = tostring(var.bot_assistant_rate_limit_rolling_window_ms)
+    },
     length(var.bot_mini_app_allowed_origins) == 0 ? {} : {
       MINI_APP_ALLOWED_ORIGINS = join(",", var.bot_mini_app_allowed_origins)
     },
diff --git a/infra/terraform/terraform.tfvars.example b/infra/terraform/terraform.tfvars.example
index 87d4768..645f7e4 100644
--- a/infra/terraform/terraform.tfvars.example
+++ b/infra/terraform/terraform.tfvars.example
@@ -11,7 +11,15 @@ mini_app_image  = "europe-west1-docker.pkg.dev/my-gcp-project/household-bot/mini
 database_url_secret_id   = "database-url"
 telegram_bot_token_secret_id = "telegram-bot-token"
 openai_api_key_secret_id = "openai-api-key"
-bot_parser_model       = "gpt-4.1-mini"
+bot_parser_model             = "gpt-4.1-mini"
+bot_purchase_parser_model    = "gpt-5-mini"
+bot_assistant_model          = "gpt-5-mini"
+bot_assistant_timeout_ms     = 15000
+bot_assistant_memory_max_turns = 12
+bot_assistant_rate_limit_burst = 5
+bot_assistant_rate_limit_burst_window_ms = 60000
+bot_assistant_rate_limit_rolling = 50
+bot_assistant_rate_limit_rolling_window_ms = 86400000
 bot_mini_app_allowed_origins = [
   "https://household-dev-mini-app-abc123-ew.a.run.app"
 ]
diff --git a/infra/terraform/variables.tf b/infra/terraform/variables.tf
index 5cb74f6..24a5b63 100644
--- a/infra/terraform/variables.tf
+++ b/infra/terraform/variables.tf
@@ -76,6 +76,62 @@ variable "bot_parser_model" {
   nullable    = true
 }
 
+variable "bot_purchase_parser_model" {
+  description = "Optional PURCHASE_PARSER_MODEL override for bot runtime"
+  type        = string
+  default     = null
+  nullable    = true
+}
+
+variable "bot_assistant_model" {
+  description = "Optional ASSISTANT_MODEL override for bot runtime"
+  type        = string
+  default     = null
+  nullable    = true
+}
+
+variable "bot_assistant_timeout_ms" {
+  description = "Optional ASSISTANT_TIMEOUT_MS override for bot runtime"
+  type        = number
+  default     = null
+  nullable    = true
+}
+
+variable "bot_assistant_memory_max_turns" {
+  description = "Optional ASSISTANT_MEMORY_MAX_TURNS override for bot runtime"
+  type        = number
+  default     = null
+  nullable    = true
+}
+
+variable "bot_assistant_rate_limit_burst" {
+  description = "Optional ASSISTANT_RATE_LIMIT_BURST override for bot runtime"
+  type        = number
+  default     = null
+  nullable    = true
+}
+
+variable "bot_assistant_rate_limit_burst_window_ms" {
+  description = "Optional ASSISTANT_RATE_LIMIT_BURST_WINDOW_MS override for bot runtime"
+  type        = number
+  default     = null
+  nullable    = true
+}
+
+variable "bot_assistant_rate_limit_rolling" {
+  description = "Optional ASSISTANT_RATE_LIMIT_ROLLING override for bot runtime"
+  type        = number
+  default     = null
+  nullable    = true
+}
+
+variable "bot_assistant_rate_limit_rolling_window_ms" {
+  description = "Optional ASSISTANT_RATE_LIMIT_ROLLING_WINDOW_MS override for bot runtime"
+  type        = number
+  default     = null
+  nullable    = true
+}
+
 variable "bot_mini_app_allowed_origins" {
   description = "Optional allow-list of mini app origins for bot CORS handling"
   type        = list(string)