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

Annotations already declare readOnlyHint=false, openWorldHint=true, idempotentHint=false, and destructiveHint=false, so the safety profile is covered. The description adds genuinely new behavior: it explains that layers, dimensions, and metadata get extracted from the remote design and that the call is slow (10-30s). It does not state what happens when the same URL is submitted twice (relevant given non-idempotence) or what object comes back.

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?

Three short sentences, front-loaded with the action and source, then the side effect, then the latency caveat. Nothing is redundant and no sentence could be dropped without losing information.

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 two-parameter creation tool with full schema coverage and no output schema, the description covers what is created, where it comes from, and the cost of the call. The main residual gap is that it never mentions access requirements or authentication, and with no output schema an agent cannot know whether a template ID is returned.

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 100%, so the schema already documents both canva_url (canva.com domains) and tags with format and limits. The description's mention of a 'Canva share URL' merely restates the schema and adds no format, constraint, or tag guidance beyond it, so the baseline 3 applies.

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?

Uses a specific verb ('Create') plus resource ('template') and names the source ('Canva share URL'), which cleanly separates it from siblings like layerre_create_layer, layerre_create_variant, and layerre_create_variants_bulk. An agent can pick this tool without opening any schema.

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 makes the required input explicit (a Canva share URL) and adds a practical usage cue: the call is expensive and may take 10-30 seconds, so the agent knows to expect latency and possibly warn the user. It stops short of naming when NOT to use it or pointing to an alternative ingestion path.

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