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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered. The description adds that the content is universal across plans, which is genuinely useful behavioral context. It says nothing about the form of the response (static reference text vs. structured steps) or its length, so the added value is modest.

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 front-loaded sentence with no filler; the colon cleanly separates the purpose from the two content areas. Slightly dense jargon ('force-free marker-training philosophy', 'push/drop/stick set mechanics') makes it a touch heavier than needed, but nothing is wasted.

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 zero-parameter, read-only explainer with no output schema, the description covers what the agent needs in order to decide to call it. The only gap is whether the content is static or varies, which matters little given the idempotent annotation.

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 tool takes zero parameters, so the schema baseline of 4 applies and there is nothing for the description to disambiguate. It correctly implies no input is required to get the explanation.

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 names a concrete resource ('a Push Drop Stick plan') and specifies the two things it explains: the force-free marker-training philosophy and the push/drop/stick set mechanics. That is more specific than the title alone and distinguishes it from plan-retrieval tools like get_plan or list_plans. It stops short of differentiating itself from the conceptually adjacent 'about_push_drop_stick', leaving some ambiguity about which explainer to open.

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 only implied: the phrase 'how to read and execute a plan' suggests consulting this before interpreting a plan, and 'that every plan shares' hints it is plan-independent. There is no explicit when-to-use, when-not, or named alternative among the siblings (about_push_drop_stick, read_handbook, get_plan). The agent must infer routing.

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