Read today's daily note

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

The readOnlyHint annotation already informs the agent that this operation is safe. The description adds no additional behavioral context beyond what the annotation provides, such as what happens if the daily note does not exist or if there are multiple daily notes.

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 a single, concise sentence that directly states the tool's function. There is no unnecessary information, and it is appropriately sized for the tool's simplicity.

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?

The tool is simple, but the description does not cover edge cases or behavior details beyond the basic function. For example, it doesn't explain what happens if today's note doesn't exist or how the content is formatted. Given the readOnlyHint and no output schema, a bit more context would be beneficial.

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?

The input schema already fully describes the single optional parameter 'vault' with its purpose and default behavior. The description does not add any extra meaning beyond the schema. With 100% schema coverage, baseline is 3.

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 that the tool returns the content of today's daily note. It uses a specific verb ('Returns') and resource ('content of today's daily note'). This distinguishes it from siblings like obsidian_read_note (reads any note) or obsidian_daily_append (appends to daily note).

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 provides no guidance on when to use this tool versus alternatives. It does not mention that this is a convenience for accessing the daily note without needing its path, nor does it exclude it for other cases. No explicit or implicit usage context.

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