feedbin_update_subscription

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

With no annotations, the description must cover the behavioral burden, and all it offers is 'Mutates Feedbin state.' That flags a write operation, but it does not say whether this requires authentication, whether the change is reversible, whether the original feed title is lost, or what happens on an invalid subscription_id. This is a real gap for a mutation tool with zero annotation coverage.

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, front-loaded with the action, with no filler. The terseness comes at the cost of the omissions noted above, but the framing itself is efficient and readable.

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-required-parameter mutation with no annotations and no output schema, the description is under-specified. It says nothing about the return value, idempotency, or how subscription_id should be sourced, all of which an agent needs before calling it confidently.

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 coverage is 0%, so the description must explain both parameters, but it only implies 'title' through the word 'custom title.' The required subscription_id is never mentioned, and nothing indicates that the title is a display override rather than the feed's canonical name, which is the one piece of semantics that would matter here.

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 specific verb and resource: set a custom title on a subscription. That is clearer than the name alone, but it does not explicitly distinguish this operation from siblings like rename_tag or update_saved_search, leaving the agent to infer that titles and tags are different things.

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 use this tool instead of alternatives, no prerequisites, and no exclusions. An agent gets no signal about how this relates to update_saved_search (a similar update operation on another resource) or about when a subscription title should be set at all.

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