unsubscribeCancel a subscription by id. Ownership is enforced — you can only cancel your own subscriptions. The row is deactivated (not deleted) so its historical events stay available via recent_alerts.
| Name | Required | Description | Default |
|---|---|---|---|
| id | Yes | Subscription id (uuid) returned by subscribe. |
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Beyond the annotations (which indicate a non-read-only, non-destructive action), the description discloses key behavioral details: ownership enforcement, deactivation rather than deletion, and preservation of historical events via 'recent_alerts'. This adds meaningful context beyond what annotations provide.
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 two sentences, efficiently front-loaded with the primary action, followed by necessary behavioral context. Every word earns its place; there is no redundancy or filler.
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 simple one-parameter tool with annotations and a well-described schema, the description covers all essential aspects: the action, ownership constraint, the deactivation behavior, and where to find historical data afterwards. It is complete without needing an output schema.
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 fully describes the 'id' parameter, including its type and origin ('returned by subscribe'). The description adds no additional parameter semantics beyond 'by id', so the baseline of 3 applies given high schema coverage.
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 the action ('Cancel a subscription by id') with a specific verb and resource. It distinguishes itself from siblings like 'subscribe' and 'list_subscriptions' by outlining the cancellation behavior and the deactivation nuance, making it unambiguous.
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 implies when to use the tool (when you want to cancel a subscription) and provides context about ownership (only your own) and the result (deactivation). It references 'recent_alerts' as the place to view historical events, indirectly pointing to an alternative. However, it lacks explicit 'use this instead of X' guidance, so it doesn't reach a perfect 5.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Add one secure layer between your agents and this server.
The tool set is dominated by a huge number of unrelated tools for data lookup (Pipeworx, Polymarket, etc.), with only 4 superhero-specific tools. Many tools serve overlapping purposes (e.g., ask_pipeworx, deep_research, suggest_questions all handle general queries), making it very difficult for an agent to distinguish the right tool.
Naming conventions are highly inconsistent: some tools use CamelCase (ask_pipeworx, discover_tools), others use snake_case (get_hero, list_all, compare_entities), and some use long descriptive phrases (polymarket_arbitrage, scan_competitor_ai_presence). This mixture makes it hard to predict tool names.
With 34 tools, the count is far too large for a server named 'superhero'. Most tools are unrelated to superheroes, making the set seem bloated and misaligned with the server's stated purpose. A focused superhero server would need at most 10 tools.
For the superhero domain, the tool set is severely incomplete: only basic retrieval of heroes and powerstats, with no search, filtering, creation, comparison, or battle mechanisms. For the broader data access domain it is more complete, but that is not the server's name.