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

With readOnlyHint=true already signaling a non-mutating operation, the description adds useful environment-specific behavior: it opens a player in interactive views and returns a watch link elsewhere. It does not fully explain output details or failure cases, but the output schema likely covers those, so the added context is meaningful without contradiction.

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

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

The description is compact and front-loads the core purpose, then explains behavior, usage, and the argument. The bilingual repetition doubles length but is appropriate for an Arabic/English product; no unnecessary fluff is present.

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

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

For a single-parameter tool with an output schema, the description covers what the tool does, how it behaves in different environments, when to use it, and where the argument value comes from. Nothing an agent needs to invoke it correctly is missing.

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

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

Schema coverage is 0%, so the description must compensate, and it does: video_id is described as 'The numeric ID of the video' and its provenance is given. This adds real meaning beyond the bare integer type, though it remains somewhat terse and gives no format or range details.

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

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

The description uses a specific verb and resource ('Play a video from Al Jazeera 360') and clearly distinguishes environments: interactive MCP apps open the official player, elsewhere it returns the watch link. This makes the tool's purpose unmistakable and separates it from sibling tools like search_videos or get_video_details.

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

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

It explicitly states when to use the tool: 'Use when the user asks to watch or play something.' It also tells the agent where the video_id comes from ('from search_videos, browse_section, etc.'). It does not enumerate alternatives or exclusions, but for a playback tool the guidance is sufficiently clear.

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