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

With no annotations at all, the description carries the full burden; it does usefully disclose prerequisites (authorized dayStoic.com token, active Premium plan) and implies read-only behavior via 'Reads'. It does not say what happens on authorization failure, whether entries are returned in any particular order, or how volume is bounded for a 30-day window.

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?

A single sentence with no filler: scope and default are front-loaded, and prerequisites follow immediately. Every clause carries information the agent needs.

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 one-parameter read tool with no output schema, this covers the essentials: what is returned, the time window, the default, and the authorization gate. The remaining gap is return shape — since there is no output schema, the description could say what a journal entry looks like or whether entries are truncated.

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% and the single `days` parameter has no schema description, so the description must compensate — and it does, supplying both the semantic (how many days back to read) and the default of 7, which the schema does not state. The 1–30 range is repeated from the schema's min/max rather than adding to it, which keeps this just short of a 5.

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 gives a specific verb and resource — 'Reads the connected Premium user's private journal entries' — with an explicit time scope, which resolves the ambiguous tool name 'my_practice'. It does not, however, name any sibling (e.g. daily_reflection or save_reflection) to differentiate itself from the other reflection-related tools.

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?

Usage is implied rather than stated: an agent can infer this is the read path for a user's own journal history, while save_reflection is presumably the write path. There is no explicit 'use this when...' or exclusion clause, and no mention of what to do if the user is not Premium or the token is missing.

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