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fix(core): clarify list_agents excludes Agent Team teammates #9432

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Merged
yiliang114 merged 2 commits into from
Aug 19, 2026
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fix(core): clarify list_agents excludes Agent Team teammates #9432

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6eadbf0
docs(tools): clarify list_agents excludes Agent Team teammates
yiliang114 Aug 18, 2026
1d60403
Merge branch 'main' into fix/9431-list-agents-prose
yiliang114 Aug 19, 2026
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17 changes: 16 additions & 1 deletion packages/core/src/tools/list-agents.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -28,7 +28,22 @@ describe('ListAgentsTool', () => {

expect(tool.name).toBe('list_agents');
expect(result.llmContent).toBe(
'No background agents are available in this session.',
'No ordinary background subagents are available in this session. ' +
'Named Agent Team teammates are not listed here; their results are ' +
'delivered automatically through team messaging, so do not use ' +
'list_agents to wait for a teammate.',
);
});

it('states the Agent Team boundary in the tool description', () => {
expect(tool.description).toContain(
'Named Agent Team teammates are NOT listed here',
);
expect(tool.description).toContain(
'deliver their final reports automatically',
);
expect(tool.description).toContain(
'do not use list_agents (or poll task_list) to wait for a teammate',
);
});

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18 changes: 13 additions & 5 deletions packages/core/src/tools/list-agents.ts
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Expand Up @@ -28,7 +28,7 @@ class ListAgentsInvocation extends BaseToolInvocation<
}

getDescription(): string {
return 'List background agents';
return 'List ordinary background subagents';
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}

async execute(): Promise<ToolResult> {
Expand All @@ -52,7 +52,11 @@ class ListAgentsInvocation extends BaseToolInvocation<
}));

if (agents.length === 0) {
const message = 'No background agents are available in this session.';
const message =
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'No ordinary background subagents are available in this session. ' +
'Named Agent Team teammates are not listed here; their results are ' +
'delivered automatically through team messaging, so do not use ' +
'list_agents to wait for a teammate.';
return { llmContent: message, returnDisplay: message };
}

Expand All @@ -75,9 +79,13 @@ export class ListAgentsTool extends BaseDeclarativeTool<
super(
ListAgentsTool.Name,
ToolDisplayNames.LIST_AGENTS,
'List addressable background agents in the current session, including ' +
'agents restored from a prior session run. Use the returned task_id ' +
'with send_message to continue a running, paused, or completed agent.',
'List addressable ordinary background subagents in the current ' +
'session, including agents restored from a prior session run. Named ' +
'Agent Team teammates are NOT listed here: they have their own team ' +
'lifecycle and deliver their final reports automatically, so do not ' +
'use list_agents (or poll task_list) to wait for a teammate. Use the ' +
'returned task_id with send_message to continue a running, paused, ' +
'or completed agent.',
Kind.Read,
{
type: 'object',
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