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

The description adds two genuinely non-obvious behaviors beyond the annotations: the operation is free (relevant since siblings include get_credit_balance and estimate_cost) and the token is stored encrypted and never returned. That is real value for a mutating tool. It omits duplicate-registration behavior, which matters given idempotentHint=false.

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?

Two short sentences with no filler, front-loading the cost signal ('Free.') and then the core action plus the security guarantee. Nothing is redundant and nothing needs re-reading.

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 non-idempotent, non-destructive registration tool with five undocumented parameters, no output schema, and no confirmation of what is returned (e.g., a target handle for later use with mbe_export), the description is thinner than the tool's complexity warrants. The encryption note covers one important gap, but parameter and follow-up behavior remain unaddressed.

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 description coverage is 0% for all five parameters, so the description carries the full burden of explaining them and largely fails. Only a weak mapping is implied ('API server' to base_url, 'project' to project_id, 'token' to token); label, branch_id, and the optionality/format of token and label are left completely unexplained.

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?

States a specific verb and resource: 'Register a SysML v2 API server and project as an export target' names both the action and the resulting artifact, which cleanly separates it from siblings like mbe_list_targets, mbe_export, or mbe_commit. It stops short of referencing any sibling by name, so the differentiation is implicit rather than explicit.

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?

There is no guidance on when to call this versus mbe_list_targets (to check for an existing target) or mbe_export (to use the target once registered). No prerequisites are stated: the description never says a token may be required for a private server, nor what to do if the same base_url/project_id is already registered.

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