docs: simplify sample graph guidance in adk-sample-creator skill

Guide sample READMEs to draw a simple agent -> tools/sub-agents topology
(covering `LlmAgent` and `ManagedAgent`) instead of a request/response
data-flow sequence, which is noisy and adds little value over the topology.
This is the systematic fix behind the graph feedback on the remote MCP sample.

Co-authored-by: Haran Rajkumar <haranrk@google.com>
PiperOrigin-RevId: 947245446

Author: haranrk

.agents/skills/adk-sample-creator/SKILL.md

@@ -89,7 +89,7 @@ Each sample should have a `README.md` with the following structure:
 
 - **Overview**: What the sample does.
 - **Sample Inputs**: Examples of inputs to test with. Each prompt must be wrapped in backticks. If a prompt has an explanation, always add a blank line between the prompt and the explanation, and indent the explanation by two spaces.
-- **Graph**: Visualization of the graph flow (Mermaid recommended). For Workflow root agents, visualize the graph flow of nodes. For LlmAgent root agents that orchestrate tools or sub-agents, visualize the topology of the agent and its tools/sub-agents instead of internal workflow nodes.
+- **Graph**: Visualization of the graph flow (Mermaid recommended). For Workflow root agents, visualize the graph flow of nodes. For agents that orchestrate tools or sub-agents (e.g., `LlmAgent`, `ManagedAgent`), visualize the topology of the agent and its tools/sub-agents instead of internal workflow nodes. Keep it a simple topology diagram (a few nodes and edges). Do **not** draw a request/response data-flow sequence (e.g., `user -> agent -> API -> tool -> ... -> user`); those are noisy and add little value over the topology.
 - **How To**: Explanation of key techniques used (e.g., `ctx.run_node`).
 - **Related Guides**: Links to relevant developer guides in `docs/guides/` that explain the concepts or classes used.
 
@@ -118,7 +118,7 @@ graph TD
     START --> MyNode
 ```
 
-For LlmAgent root agents:
+For agents that orchestrate tools or sub-agents (`LlmAgent`, `ManagedAgent`, ...):
 ```mermaid
 graph TD
     MyAgent[my_agent] -->|calls| MyTool(my_tool)