heap_begin_action

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

No annotations are provided, so the description bears the full burden. It explains that the tool marks a phase and records heap changes when paired with heap_end_action, but it does not disclose whether it modifies state, side effects, or prerequisites. For a simple marker, this is adequate but not comprehensive.

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 very concise, consisting of a few sentences with a clear structure: main description, usage note, arguments, and returns. Every sentence adds value without redundancy.

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 tool's simplicity (one parameter, paired with heap_end_action, has output schema), the description covers the essential context: when to call it, how to pair it, and what the parameter means. It could be slightly more detailed about the return value, but overall it is complete for its role.

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 has no parameter descriptions (0% coverage). The description compensates by providing an example and clarifying that action_id is an operation identifier, adding significant meaning beyond the schema.

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 marks the start of a heap operation phase and should be called before sending a payload to the CTF program. While it implicitly pairs with heap_end_action, it does not explicitly differentiate from other heap tools, hence a 4 instead of 5.

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 explicitly advises calling this tool before sending a payload and mentions using it in conjunction with heap_end_action. This provides clear context and pairing, though it does not specify when not to use it.

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