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Custom agents let you save the setup work behind a repeatable role. Instead of retyping instructions and selecting tools every time, configure an agent once and invoke it from chat with @.
Navigator custom agent example

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Agent ingredients

Instructions

Define the agent’s role, constraints, tone, and working style.

Tools

Limit the agent to the MCP servers and built-in tools it needs.

Model

Pick the provider and model that fit the agent’s cost, latency, and reasoning needs.

Sharing

Make useful agents available to a team or keep them private for personal workflows.

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Example agents

Give the agent repository context and issue/PR tools. Use it to triage issues, draft PR summaries, or prepare release notes.
Combine web search, source extraction, and table generation for market scans or competitor summaries.
Connect calendar, CRM, spreadsheet, and messaging tools through MCP or Composio-backed integrations.
Give the agent code execution and visualization tools for repeatable analysis tasks.

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Good agent design

Keep each agent narrow. A smaller set of instructions and tools makes it easier for the model to choose the right action and easier for users to predict what the agent will do.