set_journal

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

With no annotations provided, the description bears full responsibility for disclosing behavioral traits. It fails to mention whether the operation is destructive, whether it requires authentication, whether it is reversible, or if it has side effects like changing global state. The description is too minimal for a state-changing tool.

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 extremely concise (one sentence, 8 words) and front-loads the action and object. While it is efficient, it could include a bit more context without becoming verbose, such as mentioning that the active journal persists across operations. Still, it earns its place.

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 (one parameter, no output schema), but the description does not explain the implications of setting the active journal, such as its persistence, validation of journal names, or how it affects sibling tools like 'search_entries'. The description feels incomplete for a tool that changes state.

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 provides a description for the parameter 'journalName', achieving 100% schema coverage. The tool description does not add any additional meaning or constraints beyond what the schema states. According to the rules, baseline is 3 when schema coverage is high.

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 the action ('Set') and the resource ('active journal'), and implies the tool's role in setting context for subsequent operations. It distinguishes itself from sibling tools like 'list_journals' (which lists journals) and 'search_entries' (which searches entries).

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?

No guidance is provided on when to use this tool versus alternatives, such as when a journal must be set before other operations or when it should not be used (e.g., if a journal is already active). The description lacks any context about prerequisites or exclusions.

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