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app_activate

Bring iTerm2 to the front of your screen to resume terminal work or switch between applications quickly.

Instructions

Activate iTerm2 (bring to front).

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes

Implementation Reference

  • Primary MCP tool handler for 'app_activate'. Decorated with @mcp.tool(), this async function activates iTerm2 by calling app.async_activate() through the _run helper. Returns 'iTerm2 activated' on success.
    async def app_activate() -> str:
        """Activate iTerm2 (bring to front)."""
    
        async def _impl(connection: iterm2.Connection, app: iterm2.App) -> str:
            await app.async_activate()
            return "iTerm2 activated"
    
        return await _run(_impl)
  • Batch operation handler '_b_app_activate' for use within the batch() tool. Directly calls app.async_activate() without the _run wrapper since the connection is already established.
    async def _b_app_activate(
        connection: iterm2.Connection, app: iterm2.App, **_: Any,
    ) -> str:
        await app.async_activate()
        return "iTerm2 activated"
  • Registration of 'app_activate' in the batch operations dictionary, mapping the operation name to its handler function _b_app_activate.
    "app_activate": _b_app_activate,
  • Security tier assignment for 'app_activate' tool, classified as Tier.INTERACT in the security configuration.
    "app_activate": Tier.INTERACT,
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description carries the full burden. It mentions the action ('Activate') and effect ('bring to front'), but does not disclose behavioral traits such as whether this requires specific permissions, if it affects other applications, or any side effects like interrupting current processes. For a tool with zero annotation coverage, this is a significant gap in transparency.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, efficient sentence that front-loads the core action and effect with zero wasted words. It is appropriately sized for a simple, parameterless tool, making it easy to parse and understand quickly.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool's simplicity (0 parameters, has output schema), the description is minimally adequate but lacks depth. It does not explain what 'activate' entails beyond 'bring to front', nor does it cover potential errors or the output format. With no annotations and an output schema present, more context on behavior would improve completeness.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The tool has 0 parameters, and schema description coverage is 100%, so no parameter documentation is needed. The description does not add parameter semantics beyond the schema, but with no parameters, a baseline score of 4 is appropriate as it avoids unnecessary details.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the specific action ('Activate iTerm2') and the effect ('bring to front'), using a precise verb+resource combination. It distinguishes itself from sibling tools like 'app_get_focus' or 'window_focus' by explicitly targeting the application activation rather than window or session focus.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies usage when iTerm2 needs to be brought to the foreground, but it does not explicitly state when to use this tool versus alternatives like 'window_focus' or 'session_focus'. No guidance on prerequisites or exclusions is provided, leaving usage context partially inferred.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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