Explicit instructions for expected result format (#391)

## GitHub issue number
#106 

## **Associated Risks**
None

## ✅ **PR Checklist**

- [X] **I have read the [contribution
guidelines](https://github.com/microsoft/azure-devops-mcp/blob/main/CONTRIBUTING.md)**
- [X] **I have read the [code of conduct
guidelines](https://github.com/microsoft/azure-devops-mcp/blob/main/CODE_OF_CONDUCT.md)**
- [X] Title of the pull request is clear and informative.
- [X] 👌 Code hygiene
- [ ] 🔭 Telemetry added, updated, or N/A
- [ ] 📄 Documentation added, updated, or N/A
- [ ] 🛡️ Automated tests added, or N/A

## 🧪 **How did you test it?**
<img width="948" height="644" alt="image"
src="https://github.com/user-attachments/assets/3b6bc9de-9f98-46f9-8926-e3caa23b0607"
/>
<img width="1070" height="928" alt="image"
src="https://github.com/user-attachments/assets/0cff7735-cd8d-4dce-868f-5ca4e90f28fd"
/>

---------

Co-authored-by: Dan Hellem <[email protected]>

Author: ShriHumrudha

src/tools/testplans.ts

@@ -115,7 +115,12 @@ function configureTestPlanTools(server: McpServer, tokenProvider: () => Promise<
     {
       project: z.string().describe("The unique identifier (ID or name) of the Azure DevOps project."),
       title: z.string().describe("The title of the test case."),
-      steps: z.string().optional().describe("The steps to reproduce the test case. Make sure to format each step as '1. Step one|Expected result one\n2. Step two|Expected result two"),
+      steps: z
+        .string()
+        .optional()
+        .describe(
+          "The steps to reproduce the test case. Make sure to format each step as '1. Step one|Expected result one\n2. Step two|Expected result two. USE '|' as the delimiter between step and expected result. DO NOT use '|' in the description of the step or expected result."
+        ),
       priority: z.number().optional().describe("The priority of the test case."),
       areaPath: z.string().optional().describe("The area path for the test case."),
       iterationPath: z.string().optional().describe("The iteration path for the test case."),