feat: Add test-my-tools prompt for MCP server testing (#196)

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

Author: aaronsteers

connector_builder_mcp/_guidance/prompts.py

@@ -323,3 +323,24 @@
 
 **Warning**: Creative mode is less reliable and may lead to mistakes. Use only for complex scenarios.
 """
+
+TEST_MY_TOOLS_GUIDANCE = """
+Test all available tools in this MCP server to confirm they are working properly.
+
+Guidelines:
+- Iterate through each tool systematically
+- Use read-only operations whenever possible
+- For tools that modify data, use test/safe modes or skip if no safe testing method exists
+- Avoid creating persistent side effects (e.g., don't create real resources, connections, or data)
+- Document which tools were tested and their status
+- Report any errors or issues encountered
+- Provide a summary of the test results at the end
+
+Focus on validating that tools:
+1. Accept their required parameters correctly
+2. Return expected output formats
+3. Handle errors gracefully
+4. Connect to required services (if applicable)
+
+Be efficient and practical in your testing approach.
+""".strip()

connector_builder_mcp/build_strategies/declarative_yaml_v1/prompts.py

@@ -15,6 +15,7 @@
     CONNECTOR_BUILD_PROMPT,
     CREATIVE_MODE_NOTE,
     NON_CREATIVE_MODE_NOTE,
+    TEST_MY_TOOLS_GUIDANCE,
 )
 from connector_builder_mcp.mcp._mcp_utils import (
     ToolDomain,
@@ -111,6 +112,25 @@ def add_stream_to_connector(
     return [{"role": "user", "content": content}]
 
 
+@mcp_prompt(
+    name="test-my-tools",
+    description="Test all available MCP tools to confirm they are working properly",
+    domain=ToolDomain.PROMPTS,
+)
+def test_my_tools_prompt() -> list[dict[str, str]]:
+    """Generate a prompt that instructs the agent to test all available tools.
+
+    Returns:
+        List containing a single message dict with the guidance text
+    """
+    return [
+        {
+            "role": "user",
+            "content": TEST_MY_TOOLS_GUIDANCE,
+        }
+    ]
+
+
 def register_prompts(app: FastMCP) -> None:
     """Register connector builder prompts with the FastMCP app.