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+# Plugin to Resolve GUIDs to Microsoft Entra Service Principals (Enterprise Applications)
+
+## Overview
+This plugin enables users to resolve GUIDs found in security alerts to their corresponding **Microsoft Entra service principal (Enterprise Application)** display names and identifiers using the **Microsoft Graph API**. When investigating alerts, the "Caller" or source fields often contain opaque GUIDs — this plugin translates them into human-readable application names, accelerating triage and incident response. It can also be used as a tool when building a **Security Copilot Custom Agent**.
+
+## Features
+- Resolves a service principal by **Object ID** (the GUID commonly found in alert "Caller" fields).
+- Resolves a service principal by **Application (Client) ID / appId** when the GUID represents the app registration rather than the service principal object.
+- Returns key details including **display name, Object ID, appId, service principal type, account enabled status, and publisher name**.
+
+## API Endpoint
+**Base URL:** `https://graph.microsoft.com/v1.0`
+
+### Setup Instructions
+#### Upload the Plugin Manifest
+
+1. Obtain the manifest [sp guid resolver-plugin.yaml](https://github.com/Azure/Copilot-For-Security/blob/main/Plugins/Community%20Based%20Plugins/Microsoft%20Graph%20API%20plugins/GUID%20Resolution/sp%20guid%20resolver-plugin.yaml) and the OpenAPI Specification [sp guid resolver-plugin-spec.yaml](https://github.com/Azure/Copilot-For-Security/blob/main/Plugins/Community%20Based%20Plugins/Microsoft%20Graph%20API%20plugins/GUID%20Resolution/sp%20guid%20resolver-plugin-spec.yaml) files from this directory.
+2. Download the Spec file and move it to your preferred location, ensuring it is reachable by Security Copilot.
+3. [Upload the custom plugin](https://learn.microsoft.com/en-us/security-copilot/manage-plugins?tabs=securitycopilotplugin#add-custom-plugins)
+
+## Example Natural Language Queries
+Use these sample prompts to retrieve relevant data via **Security Copilot**:
+- "Resolve this caller GUID to the enterprise application name: 9cb7b82d-55cd-4265-b8a7-8899a7376e5c"
+- "Get the service principal name for ObjectId 9cb7b82d-55cd-4265-b8a7-8899a7376e5c"
+- "Resolve this appId GUID to the enterprise application name: a12e8ccb-0fcd-46f8-b6a1-000000000000"
+- "Get the service principal name for appId a12e8ccb-0fcd-46f8-b6a1-000000000000"
+
+---
+For more details, visit the **[Microsoft Graph API documentation](https://learn.microsoft.com/en-us/graph/)**.
diff --git a/Plugins/Community Based Plugins/Microsoft Graph API plugins/GUID Resolution/sp guid resolver-plugin-spec.yaml b/Plugins/Community Based Plugins/Microsoft Graph API plugins/GUID Resolution/sp guid resolver-plugin-spec.yaml
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+openapi: 3.0.0
+info:
+  title: Entra Service Principal GUID Resolver
+  version: 1.0.0
+  description: >
+    Resolve a GUID from security alerts to the Microsoft Entra service principal (Enterprise Application)
+    display name and identifiers using Microsoft Graph.
+
+servers:
+  - url: https://graph.microsoft.com/v1.0
+
+paths:
+  /servicePrincipals/{id}:
+    get:
+      operationId: GetServicePrincipalByObjectId
+      summary: Resolve a service principal by Object ID (Caller GUID)
+      description: >
+        Retrieves Microsoft Entra service principal (Enterprise Application) details using the service principal
+        Object ID. Use when an alert "Caller" field contains a GUID that is the enterprise application's Object ID.
+        #ExamplePrompts Resolve this caller GUID to the enterprise application name: 9cb7b82d-55cd-4265-b8a7-8899a7376e5c
+        #ExamplePrompts Get the service principal name for ObjectId 9cb7b82d-55cd-4265-b8a7-8899a7376e5c
+      parameters:
+        - name: id
+          in: path
+          required: true
+          description: Service principal Object ID (GUID)
+          schema:
+            type: string
+      responses:
+        "200":
+          description: Service principal found
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/ServicePrincipal"
+        "404":
+          description: Not found
+
+  "/servicePrincipals(appId='{appId}')":
+    get:
+      operationId: GetServicePrincipalByAppId
+      summary: Resolve a service principal by Application (Client) ID / appId
+      description: >
+        Retrieves Microsoft Entra service principal (Enterprise Application) details using the Application (Client) ID (appId).
+        Use when the GUID you have is the AppId rather than the service principal Object ID.
+        #ExamplePrompts Resolve this appId GUID to the enterprise application name: a12e8ccb-0fcd-46f8-b6a1-000000000000
+        #ExamplePrompts Get the service principal name for appId a12e8ccb-0fcd-46f8-b6a1-000000000000
+      parameters:
+        - name: appId
+          in: path
+          required: true
+          description: Application (Client) ID / appId (GUID)
+          schema:
+            type: string
+      responses:
+        "200":
+          description: Service principal found
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/ServicePrincipal"
+        "404":
+          description: Not found
+
+components:
+  schemas:
+    ServicePrincipal:
+      type: object
+      properties:
+        id:
+          type: string
+          description: Service principal Object ID
+        appId:
+          type: string
+          description: Application (Client) ID
+        displayName:
+          type: string
+          description: Enterprise Application (service principal) display name
+        servicePrincipalType:
+          type: string
+        accountEnabled:
+          type: boolean
+        publisherName:
+          type: string
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diff --git a/Plugins/Community Based Plugins/Microsoft Graph API plugins/GUID Resolution/sp guid resolver-plugin.yaml b/Plugins/Community Based Plugins/Microsoft Graph API plugins/GUID Resolution/sp guid resolver-plugin.yaml
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+Descriptor:
+  Name: EntraSpnGuidResolver
+  DisplayName: Entra SPN-App Resolver
+  Description: Resolves a GUID from alerts service principal ObjectId or appId) to Enterprise Application or service principal display name via Microsoft Graph.
+  SupportedAuthTypes:
+    - AADDelegated
+  Authorization:
+    Type: AADDelegated
+    EntraScopes: https://graph.microsoft.com/.default
+SkillGroups:
+  - Format: API
+    Settings:
+      OpenApiSpecUrl: < url to your spec file>
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