Exam GH-600 Topic 3 Question 18 Discussion
Actual exam question for Microsoft's GH-600 exam
Question #: 18
Topic #: 3
Question #: 18
Topic #: 3
You have a GitHub Copilot coding agent named Orchestrator that runs a multi-phase workflow by using the following subagents:
Explorer gathers context by using read-only tools.
Modifier applies focused edits.
You are adding a new agent named Summarizer that generates a concise summary after modifications are complete. Summarizer includes the following YAML frontmatter:
---
name: Summarizer
description: Produce a concise summary of recent changes
tools: ['fetch']
user-invocable: false
disable-model-invocation: true
---
The Orchestrator agent lists all three agents in its agents property.
After adding the Summarizer agent, Orchestrator successfully runs Explorer and Modifier but fails to run Summarizer.
What is a possible cause of the failure?
Explorer gathers context by using read-only tools.
Modifier applies focused edits.
You are adding a new agent named Summarizer that generates a concise summary after modifications are complete. Summarizer includes the following YAML frontmatter:
---
name: Summarizer
description: Produce a concise summary of recent changes
tools: ['fetch']
user-invocable: false
disable-model-invocation: true
---
The Orchestrator agent lists all three agents in its agents property.
After adding the Summarizer agent, Orchestrator successfully runs Explorer and Modifier but fails to run Summarizer.
What is a possible cause of the failure?
Suggested Answer: D Vote an answer
D is the best answer among the available choices. The key detail is that Summarizer is explicitly listed in Orchestrator's agents property. Current VS Code agent orchestration behavior states that explicitly listing a custom agent in the parent's agents array overrides disable-model-invocation: true for that coordinator. Therefore, option A does not explain the failure in this scenario.
Likewise, user-invocable: false does not prohibit programmatic or subagent invocation. It merely prevents users from manually selecting that agent from the agent picker; this setting is commonly used specifically for worker agents that should only operate as subagents.
Option C is also incorrect because Summarizer's function is to produce a summary, not modify repository content. It therefore does not inherently require editing tools.
The agents property establishes which subagents the coordinator is permitted to invoke; it does not itself define the sequence of workflow transitions. Handoffs are the mechanism for defining explicit guided transitions between agents. If the workflow expects Summarizer to run as the next defined phase but no corresponding transition/invocation exists, the missing handoff can explain why execution stops after Modifier.
Study Guide Reference Topics: Orchestrate Multi-Agent Coordination; custom subagents; agents restrictions; agent invocation controls; sequential handoffs and workflow transitions.
Likewise, user-invocable: false does not prohibit programmatic or subagent invocation. It merely prevents users from manually selecting that agent from the agent picker; this setting is commonly used specifically for worker agents that should only operate as subagents.
Option C is also incorrect because Summarizer's function is to produce a summary, not modify repository content. It therefore does not inherently require editing tools.
The agents property establishes which subagents the coordinator is permitted to invoke; it does not itself define the sequence of workflow transitions. Handoffs are the mechanism for defining explicit guided transitions between agents. If the workflow expects Summarizer to run as the next defined phase but no corresponding transition/invocation exists, the missing handoff can explain why execution stops after Modifier.
Study Guide Reference Topics: Orchestrate Multi-Agent Coordination; custom subagents; agents restrictions; agent invocation controls; sequential handoffs and workflow transitions.
by paraslalchandani2 at Sep 18, 2026, 05:20 AM
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paraslalchandani2
2026-09-18 05:20:02Upvoting a comment with a selected answer will also increase the vote count towards that answer by one. So if you see a comment that you already agree with, you can upvote it instead of posting a new comment.
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