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

With only readOnlyHint=false in annotations, the description adds meaningful behavior: it is mutating, requires X-License-Key auth, and uses AES-256-GCM secret vaulting plus HMAC signature verification. It does not disclose duplicate/overwrite handling, idempotency, or other side effects, so it falls short of a 5.

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 three compact sentences with the core purpose front-loaded, followed by mutation and authentication context. No sentence is wasted or redundant.

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 an 8-parameter mutation with 100% schema coverage and an output schema, the description gives the essential auth and security context. It still omits duplicate/overwrite behavior and explicit alternative-tool routing, but is largely complete for invocation.

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 all 8 parameters are already documented in the input schema. The description does not add per-parameter meaning beyond what the schema provides, making the baseline 3 appropriate.

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 ('Registers') and resource ('new cloud webhook changefeed connector or remote MCP server'), scoped to continuous auto-sync. The word 'new' and the registration action clearly distinguish it from list/get/inspect siblings such as icx_list_connectors and icx_get_connector_document.

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?

It states that this is a mutating operation and requires X-License-Key authentication, but gives no explicit guidance on when to choose it over icx_trigger_sync, icx_list_connectors, or icx_inspect_connector_facts. Usage is implied by 'Registers a new...' rather than clearly routed.

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