Extract config modules into erato_config crate

backend/Cargo.toml

@@ -1,6 +1,6 @@
 [workspace]
 resolver = "2"
-members = ["erato", "mock-llm-server", "mock-mcp-server", "rmcp-sse"]
+members = ["erato", "erato_config", "mock-llm-server", "mock-mcp-server", "rmcp-sse"]
 
 [profile.dev]
 split-debuginfo = "packed"

backend/erato/Cargo.toml

@@ -18,6 +18,8 @@ name = "record-chat-provider-reqwest"
 path = "./src/record_chat_provider_reqwest.rs"
 
 [dependencies]
+erato_config = { path = "../erato_config" }
+
 # Dependencies: Server
 axum = { version = "0.8.4", features = ["macros", "ws"] }
 axum-extra = { version = "0.10.1", features = ["typed-header", "multipart"] }
@@ -50,7 +52,6 @@ aes-gcm-siv = "0.11.1"
 hmac = "0.13.0"
 jsonwebtoken = "10.4.0"
 regorus = "0.5.0"
-secrecy = "0.10.3"
 sha2 = "0.11.0"
 
 # Dependencies: Async runtime
@@ -105,10 +106,8 @@ graph-rs-sdk = { version = "3.0", default-features = false, features = ["rustls-
 regex = "1.12.3"
 rand = "0.9.4"
 base64 = "0.22.1"
-facet = "0.44.3"
 # Newtype utility
 synonym = "0.1.5"
-config = "0.15.6"
 toml_edit = "0.23.10"
 dotenv-flow = "0.16.2"
 handlebars = "6"

backend/erato/src/gen_config_reference.rs

@@ -2,7 +2,7 @@
 use std::fs;
 use std::process;
 
-use erato::config_reference::{generate_config_reference, validate_config_reference};
+use erato_config::config_reference::{generate_config_reference, validate_config_reference};
 
 fn main() {
     let args: Vec<String> = std::env::args().collect();

backend/erato/src/lib.rs

@@ -6,9 +6,9 @@ use server::router::MainRouterApiDoc;
 use crate::server::router::MAIN_ROUTER_DOC;
 
 pub mod actors;
-pub mod config;
-pub mod config_facet_attrs;
-pub mod config_reference;
+pub use erato_config::config;
+pub use erato_config::config_facet_attrs;
+pub use erato_config::config_reference;
 pub mod db;
 pub mod frontend_environment;
 pub mod metrics;
@@ -21,7 +21,7 @@ pub mod profiling;
 pub mod query_metrics;
 pub mod server;
 pub mod services;
-pub mod startup_log;
+pub use erato_config::startup_log;
 pub mod state;
 pub mod telemetry;
 pub mod translation_po;

backend/erato/src/services/client_actions.rs

@@ -13,7 +13,7 @@ use serde_json::{Value, json};
 
 /// Name of the synthetic tool offered to the model when the active action
 /// facet declares `client_actions`.
-pub const CLIENT_ACTION_TOOL_NAME: &str = "propose_client_action";
+pub use erato_config::config::CLIENT_ACTION_TOOL_NAME;
 
 /// Build the synthetic client-action tool with an enum-constrained input
 /// schema, so the model can only select one of the configured actions.

backend/erato/tests/integration_tests/config.rs

@@ -2,7 +2,7 @@
 
 use crate::test_utils::hermetic_app_config;
 use crate::{MIGRATOR, test_app_state};
-use erato::config::{
+use erato_config::config::{
     AppConfig, FileTypeDetectionMode, GenerationConfig, ModelReasoningEffort, ModelVerbosity,
     PromptSourceSpecification, RuntimeConfigurationConfig, ServerConfig, SharepointAllDrivesSource,
 };

backend/erato_config/Cargo.toml

@@ -0,0 +1,19 @@
+[package]
+name = "erato_config"
+version = "0.6.2"
+description = "Shared configuration representation and loading for Erato"
+license = "AGPL-3.0-or-later"
+edition = "2024"
+
+[dependencies]
+base64 = "0.22.1"
+config = "0.15.6"
+eyre = "0.6.12"
+facet = "0.44.3"
+regex = "1.12.3"
+secrecy = "0.10.3"
+serde = { version = "1.0.217", features = ["derive"] }
+serde_json = "1.0.138"
+tracing = "0.1.41"
+utoipa = { version = "5.3.1", features = ["uuid", "chrono"] }
+url = "2.5.8"

backend/erato/src/config.rs → backend/erato_config/src/config.rs

@@ -16,6 +16,9 @@ use utoipa::ToSchema;
 use crate::config_facet_attrs as erato_config;
 use crate::startup_log;
 
+/// Name reserved for the synthetic client-action tool exposed by the backend.
+pub const CLIENT_ACTION_TOOL_NAME: &str = "propose_client_action";
+
 const DEFAULT_PROMPT_OPTIMIZER_PROMPT: &str = r#"
 You are Lyra, a master-level AI prompt optimization specialist.
 Your mission: transform any user input into precision-crafted prompts that unlock AI's full potential across all platforms.
@@ -1014,7 +1017,7 @@ impl AppConfig {
                     tool.name
                 );
             }
-            if name == crate::services::client_actions::CLIENT_ACTION_TOOL_NAME {
+            if name == CLIENT_ACTION_TOOL_NAME {
                 panic!("Client tool named '{}' is reserved.", name);
             }
             let namespace = tool.namespace_or_default();
@@ -1038,7 +1041,7 @@ impl AppConfig {
                     .chars()
                     .all(|c| c.is_ascii_alphanumeric() || c == '_' || c == '-'))
             {
-                crate::startup_log::warn_preinit(format!(
+                startup_log::warn_preinit(format!(
                     "Client tool name '{}' does not match ^[a-zA-Z0-9_-]{{1,64}}$; \
                      OpenAI/Azure and Anthropic reject such tool names at request time.",
                     name

backend/erato_config/src/lib.rs

@@ -0,0 +1,6 @@
+//! Shared Erato configuration types, loading, validation, and reference metadata.
+
+pub mod config;
+pub mod config_facet_attrs;
+pub mod config_reference;
+pub mod startup_log;