🎭 feat: Override Custom Endpoint Schema with Specified Params Endpoint (#11788)

* 🔧 refactor: Simplify payload parsing and enhance getSaveOptions logic

- Removed unused bedrockInputSchema from payloadParser, streamlining the function.
- Updated payloadParser to handle optional chaining for model parameters.
- Enhanced getSaveOptions to ensure runOptions defaults to an empty object if parsing fails, improving robustness.
- Adjusted the assignment of maxContextTokens to use the instance variable for consistency.

* 🔧 fix: Update maxContextTokens assignment logic in initializeAgent function

- Enhanced the maxContextTokens assignment to allow for user-defined values, ensuring it defaults to a calculated value only when not provided or invalid. This change improves flexibility in agent initialization.

* 🧪 test: Add unit tests for initializeAgent function

- Introduced comprehensive unit tests for the initializeAgent function, focusing on maxContextTokens behavior.
- Tests cover scenarios for user-defined values, fallback calculations, and edge cases such as zero and negative values, enhancing overall test coverage and reliability of agent initialization logic.

* refactor: default params Endpoint Configuration Handling

- Integrated `getEndpointsConfig` to fetch endpoint configurations, allowing for dynamic handling of `defaultParamsEndpoint`.
- Updated `buildEndpointOption` to pass `defaultParamsEndpoint` to `parseCompactConvo`, ensuring correct parameter handling based on endpoint type.
- Added comprehensive unit tests for `buildDefaultConvo` and `cleanupPreset` to validate behavior with `defaultParamsEndpoint`, covering various scenarios and edge cases.
- Refactored related hooks and utility functions to support the new configuration structure, improving overall flexibility and maintainability.

* refactor: Centralize defaultParamsEndpoint retrieval

- Introduced `getDefaultParamsEndpoint` function to streamline the retrieval of `defaultParamsEndpoint` across various hooks and middleware.
- Updated multiple files to utilize the new function, enhancing code consistency and maintainability.
- Removed redundant logic for fetching `defaultParamsEndpoint`, simplifying the codebase.

api/server/controllers/agents/client.js

@@ -39,7 +39,6 @@ const {
   PermissionTypes,
   isAgentsEndpoint,
   isEphemeralAgentId,
-  bedrockInputSchema,
   removeNullishValues,
 } = require('librechat-data-provider');
 const { spendTokens, spendStructuredTokens } = require('~/models/spendTokens');
@@ -69,17 +68,11 @@ const omitTitleOptions = new Set([
  * @param {Agent} agent
  * @param {string} endpoint
  */
-const payloadParser = ({ req, agent, endpoint }) => {
+const payloadParser = ({ req, endpoint }) => {
   if (isAgentsEndpoint(endpoint)) {
-    return { model: undefined };
-  } else if (endpoint === EModelEndpoint.bedrock) {
-    const parsedValues = bedrockInputSchema.parse(agent.model_parameters);
-    if (parsedValues.thinking == null) {
-      parsedValues.thinking = false;
-    }
-    return parsedValues;
+    return;
   }
-  return req.body.endpointOption.model_parameters;
+  return req.body?.endpointOption?.model_parameters;
 };
 
 function createTokenCounter(encoding) {
@@ -296,14 +289,9 @@ class AgentClient extends BaseClient {
   checkVisionRequest() {}
 
   getSaveOptions() {
-    // TODO:
-    // would need to be override settings; otherwise, model needs to be undefined
-    // model: this.override.model,
-    // instructions: this.override.instructions,
-    // additional_instructions: this.override.additional_instructions,
     let runOptions = {};
     try {
-      runOptions = payloadParser(this.options);
+      runOptions = payloadParser(this.options) ?? {};
     } catch (error) {
       logger.error(
         '[api/server/controllers/agents/client.js #getSaveOptions] Error parsing options',
@@ -314,14 +302,14 @@ class AgentClient extends BaseClient {
     return removeNullishValues(
       Object.assign(
         {
+          spec: this.options.spec,
+          iconURL: this.options.iconURL,
           endpoint: this.options.endpoint,
           agent_id: this.options.agent.id,
           modelLabel: this.options.modelLabel,
-          maxContextTokens: this.options.maxContextTokens,
           resendFiles: this.options.resendFiles,
           imageDetail: this.options.imageDetail,
-          spec: this.options.spec,
-          iconURL: this.options.iconURL,
+          maxContextTokens: this.maxContextTokens,
         },
         // TODO: PARSE OPTIONS BY PROVIDER, MAY CONTAIN SENSITIVE DATA
         runOptions,