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feat(core): optimize sub-agents system prompt intro #18608

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NTaylorMullen merged 2 commits into from
Feb 10, 2026
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feat(core): optimize sub-agents system prompt intro #18608

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9b06e70
feat(core): optimize sub-agents system prompt intro
NTaylorMullen Feb 9, 2026
dd22d27
fix(core): ensure sub-agent names reflect tool names
NTaylorMullen Feb 9, 2026
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56 changes: 10 additions & 46 deletions packages/core/src/core/__snapshots__/prompts.test.ts.snap
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Expand Up @@ -532,11 +532,7 @@ exports[`Core System Prompt (prompts.ts) > should append userMemory with separat

# Available Sub-Agents

Sub-agents are specialized expert agents that you can use to assist you in the completion of all or part of a task.

Each sub-agent is available as a tool of the same name. You MUST always delegate tasks to the sub-agent with the relevant expertise, if one is available.

The following tools can be used to start sub-agents:
Sub-agents are specialized expert agents. Each sub-agent is available as a tool of the same name. You MUST delegate tasks to the sub-agent with the most relevant expertise.

<available_subagents>
<subagent>
Expand Down Expand Up @@ -1331,11 +1327,7 @@ exports[`Core System Prompt (prompts.ts) > should include correct sandbox instru

# Available Sub-Agents

Sub-agents are specialized expert agents that you can use to assist you in the completion of all or part of a task.

Each sub-agent is available as a tool of the same name. You MUST always delegate tasks to the sub-agent with the relevant expertise, if one is available.

The following tools can be used to start sub-agents:
Sub-agents are specialized expert agents. Each sub-agent is available as a tool of the same name. You MUST delegate tasks to the sub-agent with the most relevant expertise.

<available_subagents>
<subagent>
Expand Down Expand Up @@ -1454,11 +1446,7 @@ exports[`Core System Prompt (prompts.ts) > should include correct sandbox instru

# Available Sub-Agents

Sub-agents are specialized expert agents that you can use to assist you in the completion of all or part of a task.

Each sub-agent is available as a tool of the same name. You MUST always delegate tasks to the sub-agent with the relevant expertise, if one is available.

The following tools can be used to start sub-agents:
Sub-agents are specialized expert agents. Each sub-agent is available as a tool of the same name. You MUST delegate tasks to the sub-agent with the most relevant expertise.

<available_subagents>
<subagent>
Expand Down Expand Up @@ -1577,11 +1565,7 @@ exports[`Core System Prompt (prompts.ts) > should include correct sandbox instru

# Available Sub-Agents

Sub-agents are specialized expert agents that you can use to assist you in the completion of all or part of a task.

Each sub-agent is available as a tool of the same name. You MUST always delegate tasks to the sub-agent with the relevant expertise, if one is available.

The following tools can be used to start sub-agents:
Sub-agents are specialized expert agents. Each sub-agent is available as a tool of the same name. You MUST delegate tasks to the sub-agent with the most relevant expertise.

<available_subagents>
<subagent>
Expand Down Expand Up @@ -1808,15 +1792,11 @@ exports[`Core System Prompt (prompts.ts) > should include sub-agents in XML for

# Available Sub-Agents

Sub-agents are specialized expert agents that you can use to assist you in the completion of all or part of a task.

Each sub-agent is available as a tool of the same name. You MUST always delegate tasks to the sub-agent with the relevant expertise, if one is available.

The following tools can be used to start sub-agents:
Sub-agents are specialized expert agents. Each sub-agent is available as a tool of the same name. You MUST delegate tasks to the sub-agent with the most relevant expertise.

<available_subagents>
<subagent>
<name>Test Agent</name>
<name>test-agent</name>
<description>A test agent description</description>
</subagent>
</available_subagents>
Expand Down Expand Up @@ -2039,11 +2019,7 @@ exports[`Core System Prompt (prompts.ts) > should return the base prompt when us

# Available Sub-Agents

Sub-agents are specialized expert agents that you can use to assist you in the completion of all or part of a task.

Each sub-agent is available as a tool of the same name. You MUST always delegate tasks to the sub-agent with the relevant expertise, if one is available.

The following tools can be used to start sub-agents:
Sub-agents are specialized expert agents. Each sub-agent is available as a tool of the same name. You MUST delegate tasks to the sub-agent with the most relevant expertise.

<available_subagents>
<subagent>
Expand Down Expand Up @@ -2158,11 +2134,7 @@ exports[`Core System Prompt (prompts.ts) > should return the base prompt when us

# Available Sub-Agents

Sub-agents are specialized expert agents that you can use to assist you in the completion of all or part of a task.

Each sub-agent is available as a tool of the same name. You MUST always delegate tasks to the sub-agent with the relevant expertise, if one is available.

The following tools can be used to start sub-agents:
Sub-agents are specialized expert agents. Each sub-agent is available as a tool of the same name. You MUST delegate tasks to the sub-agent with the most relevant expertise.

<available_subagents>
<subagent>
Expand Down Expand Up @@ -2388,11 +2360,7 @@ exports[`Core System Prompt (prompts.ts) > should use chatty system prompt for p

# Available Sub-Agents

Sub-agents are specialized expert agents that you can use to assist you in the completion of all or part of a task.

Each sub-agent is available as a tool of the same name. You MUST always delegate tasks to the sub-agent with the relevant expertise, if one is available.

The following tools can be used to start sub-agents:
Sub-agents are specialized expert agents. Each sub-agent is available as a tool of the same name. You MUST delegate tasks to the sub-agent with the most relevant expertise.

<available_subagents>
<subagent>
Expand Down Expand Up @@ -2507,11 +2475,7 @@ exports[`Core System Prompt (prompts.ts) > should use chatty system prompt for p

# Available Sub-Agents

Sub-agents are specialized expert agents that you can use to assist you in the completion of all or part of a task.

Each sub-agent is available as a tool of the same name. You MUST always delegate tasks to the sub-agent with the relevant expertise, if one is available.

The following tools can be used to start sub-agents:
Sub-agents are specialized expert agents. Each sub-agent is available as a tool of the same name. You MUST delegate tasks to the sub-agent with the most relevant expertise.

<available_subagents>
<subagent>
Expand Down
2 changes: 1 addition & 1 deletion packages/core/src/core/prompts.test.ts
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Expand Up @@ -178,7 +178,7 @@ describe('Core System Prompt (prompts.ts)', () => {
expect(prompt).toContain('# Available Sub-Agents');
expect(prompt).toContain('<available_subagents>');
expect(prompt).toContain('<subagent>');
expect(prompt).toContain('<name>Test Agent</name>');
expect(prompt).toContain('<name>test-agent</name>');
expect(prompt).toContain(
'<description>A test agent description</description>',
);
Expand Down
2 changes: 1 addition & 1 deletion packages/core/src/prompts/promptProvider.ts
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Expand Up @@ -120,7 +120,7 @@ export class PromptProvider {
.getAgentRegistry()
.getAllDefinitions()
.map((d) => ({
name: d.displayName || d.name,
name: d.name,
description: d.description,
})),
),
Expand Down
6 changes: 1 addition & 5 deletions packages/core/src/prompts/snippets.ts
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Expand Up @@ -175,11 +175,7 @@ export function renderSubAgents(subAgents?: SubAgentOptions[]): string {
return `
# Available Sub-Agents

Sub-agents are specialized expert agents that you can use to assist you in the completion of all or part of a task.

Each sub-agent is available as a tool of the same name. You MUST always delegate tasks to the sub-agent with the relevant expertise, if one is available.

The following tools can be used to start sub-agents:
Sub-agents are specialized expert agents. Each sub-agent is available as a tool of the same name. You MUST delegate tasks to the sub-agent with the most relevant expertise.

<available_subagents>
${subAgentsXml}
Expand Down
2 changes: 1 addition & 1 deletion packages/core/src/prompts/utils.ts
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Expand Up @@ -77,7 +77,7 @@ export function applySubstitutions(
.getAgentRegistry()
.getAllDefinitions()
.map((d) => ({
name: d.displayName || d.name,
name: d.name,
description: d.description,
})),
);
Expand Down
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