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

Annotations already provide readOnlyHint=true, idempotentHint=true, destructiveHint=false. The description adds value by stating it is a 'Free local tool' and 'No x402 charge', and includes execution guidance about direct calling. No contradictions with annotations.

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 first part is concise (3 sentences), but the second part contains a generic boilerplate 'SAP MCP execution guidance' that is lengthy and not specific to this tool. This reduces conciseness. The front-loaded content is good, but the boilerplate adds unnecessary length.

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?

Given the simple schema (3 params, all described), rich annotations, and the presence of an output schema, the description covers the purpose, pricing, and execution context. It is adequate for an agent to use the tool, though it could mention how to interpret 'events' or give an example. Sibling tool differentiation is missing but completeness is still high.

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 100%, so parameters (limit, since, streamType) are already described in the input schema. The description implies the use of streamType and since (time range) but adds no additional semantics beyond what the schema provides. Baseline score of 3 is appropriate.

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 clearly states 'Returns all events (consumed + unconsumed) for a stream type within a time range. Used for backtest and analysis.' It uses a specific verb 'Returns' and resource 'events', and distinguishes itself from sibling stream tools (e.g., sap_stream_consume) by explicitly mentioning both consumed and unconsumed events and the use case of backtesting.

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?

The description gives a use case ('Used for backtest and analysis') and mentions pricing and routing, but does not explicitly compare to sibling tools like sap_stream_buffer or sap_stream_consume. There is no guidance on when to use this tool versus alternatives, nor any exclusion criteria.

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