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dmang-dev

mcp-retroarch

retroarch_get_status

Reads RetroArch emulator status: playing/paused state, loaded system, game basename, and CRC32. Required before toggling pause or frame advance to verify current state.

Instructions

PURPOSE: Report whether RetroArch is currently playing or paused, plus the loaded system, game basename, and CRC32. USAGE: Call after retroarch_ping to learn what (if anything) is loaded; before retroarch_pause_toggle to decide whether the toggle will pause or unpause; before retroarch_frame_advance (which only steps when paused); whenever you need to confirm the previous fire-and-forget control command (pause/reset/load_state) actually took effect. For RetroArch settings (paths, flags) use retroarch_get_config instead — this tool only reports run-state and the loaded ROM identity. BEHAVIOR: No side effects — pure read of emulator status via the NCI's GET_STATUS command. Returns 'No content loaded' (state=contentless) when RetroArch is sitting at the menu with no ROM. Returns an error on UDP timeout (RetroArch not reachable). RETURNS: When content is loaded: four lines 'State: playing|paused', 'System: SYSTEM_ID', 'Game: BASENAME', 'CRC32: HEX or (none reported)'. When no content: literal 'No content loaded'.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Behavior5/5

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

Without annotations, the description fully discloses no side effects (pure read), error on timeout, contentless state message, and exact return format. Exceeds typical 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?

Well-structured with PURPOSE, USAGE, BEHAVIOR, RETURNS sections. Every sentence is necessary and concise.

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

Completeness5/5

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

Given no output schema, the description thoroughly explains return values, error states, and integration with sibling tools. Complete for reliable agent use.

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?

No parameters, so schema provides no parameter info. Description adds value by detailing output format, compensating for absence of parameters.

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?

Description clearly states the tool reports playing/paused state, loaded system, game basename, and CRC32. It uses a specific verb and resource, and distinguishes from retroarch_get_config.

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

Usage Guidelines5/5

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

Provides explicit when-to-use scenarios (after ping, before pause_toggle, before frame_advance, to confirm commands) and when not to use (use retroarch_get_config for settings).

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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