feat: add ability to override parameters using HTTP headers MCP-293

README.md

@@ -346,6 +346,7 @@ The MongoDB MCP Server can be configured using multiple methods, with the follow
 
 | CLI Option                             | Environment Variable                                | Default                                                                                                | Description                                                                                                                                                                                     |
 | -------------------------------------- | --------------------------------------------------- | ------------------------------------------------------------------------------------------------------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| `allowRequestOverrides`                | `MDB_MCP_ALLOW_REQUEST_OVERRIDES`                   | `false`                                                                                                | When set to true, allows configuration values to be overridden via request headers and query parameters.                                                                                        |
 | `apiClientId`                          | `MDB_MCP_API_CLIENT_ID`                             | `<not set>`                                                                                            | Atlas API client ID for authentication. Required for running Atlas tools.                                                                                                                       |
 | `apiClientSecret`                      | `MDB_MCP_API_CLIENT_SECRET`                         | `<not set>`                                                                                            | Atlas API client secret for authentication. Required for running Atlas tools.                                                                                                                   |
 | `atlasTemporaryDatabaseUserLifetimeMs` | `MDB_MCP_ATLAS_TEMPORARY_DATABASE_USER_LIFETIME_MS` | `14400000`                                                                                             | Time in milliseconds that temporary database users created when connecting to MongoDB Atlas clusters will remain active before being automatically deleted.                                     |

package.json

@@ -65,7 +65,7 @@
     "generate": "npm run generate:api && npm run generate:arguments",
     "generate:api": "./scripts/generate.sh",
     "generate:arguments": "tsx scripts/generateArguments.ts",
-    "test": "vitest --project eslint-rules --project unit-and-integration --coverage",
+    "test": "vitest --project eslint-rules --project unit-and-integration --coverage --run",
     "pretest:accuracy": "npm run build",
     "test:accuracy": "sh ./scripts/accuracy/runAccuracyTests.sh",
     "test:long-running-tests": "vitest --project long-running-tests --coverage",

scripts/generateArguments.ts

@@ -12,7 +12,6 @@ import { readFileSync, writeFileSync } from "fs";
 import { join, dirname } from "path";
 import { fileURLToPath } from "url";
 import { UserConfigSchema, configRegistry } from "../src/common/config/userConfig.js";
-import assert from "assert";
 import { execSync } from "child_process";
 import { OPTIONS } from "../src/common/config/argsParserOptions.js";
 
@@ -69,12 +68,8 @@ function extractZodDescriptions(): Record<string, ConfigMetadata> {
         let description = schema.description || `Configuration option: ${key}`;
 
         if ("innerType" in schema.def) {
-            // "pipe" is used for our comma-separated arrays
+            // "pipe" is also used for our comma-separated arrays
             if (schema.def.innerType.def.type === "pipe") {
-                assert(
-                    description.startsWith("An array of"),
-                    `Field description for field "${key}" with array type does not start with 'An array of'`
-                );
                 description = description.replace("An array of", "Comma separated values of");
             }
         }

server.json

@@ -16,6 +16,13 @@
         "type": "stdio"
       },
       "environmentVariables": [
+        {
+          "name": "MDB_MCP_ALLOW_REQUEST_OVERRIDES",
+          "description": "When set to true, allows configuration values to be overridden via request headers and query parameters.",
+          "isRequired": false,
+          "format": "string",
+          "isSecret": false
+        },
         {
           "name": "MDB_MCP_API_CLIENT_ID",
           "description": "Atlas API client ID for authentication. Required for running Atlas tools.",
@@ -186,6 +193,12 @@
         }
       ],
       "packageArguments": [
+        {
+          "type": "named",
+          "name": "--allowRequestOverrides",
+          "description": "When set to true, allows configuration values to be overridden via request headers and query parameters.",
+          "isRequired": false
+        },
         {
           "type": "named",
           "name": "--apiClientId",
@@ -344,6 +357,13 @@
         "type": "stdio"
       },
       "environmentVariables": [
+        {
+          "name": "MDB_MCP_ALLOW_REQUEST_OVERRIDES",
+          "description": "When set to true, allows configuration values to be overridden via request headers and query parameters.",
+          "isRequired": false,
+          "format": "string",
+          "isSecret": false
+        },
         {
           "name": "MDB_MCP_API_CLIENT_ID",
           "description": "Atlas API client ID for authentication. Required for running Atlas tools.",
@@ -514,6 +534,12 @@
         }
       ],
       "packageArguments": [
+        {
+          "type": "named",
+          "name": "--allowRequestOverrides",
+          "description": "When set to true, allows configuration values to be overridden via request headers and query parameters.",
+          "isRequired": false
+        },
         {
           "type": "named",
           "name": "--apiClientId",