list_subscriptionsList the caller's active subscriptions. Returns id, type, params, created_at, last_fired_at, fire_count for each. Use this to review what you're monitoring before adding more or to find an id to cancel.
| Name | Required | Description | Default |
|---|---|---|---|
| include_inactive | No | Include cancelled subscriptions in the response (default false). |
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare read-only and safe behavior, and the description adds value by disclosing the exact return fields (id, type, params, created_at, last_fired_at, fire_count) and the default filtering to active subscriptions. No contradiction with annotations.
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, front-loaded with the main purpose, then return fields, then a practical usage hint. Every sentence provides valuable information with no wasted words.
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 single-parameter list tool with strong annotations, the description is complete: it states the purpose, return structure, and usage scenarios. No additional context seems necessary for correct selection or 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% for the only parameter (include_inactive), so the schema fully documents it. The description indirectly reinforces the default behavior but adds no extra parameter semantics beyond the schema.
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 tool's purpose: 'List the caller's active subscriptions.' It specifies the resource (subscriptions) and scope (caller's active), and differentiates from siblings by focusing on listing vs. subscribing/unsubscribing.
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 gives explicit usage context: 'Use this to review what you're monitoring before adding more or to find an id to cancel.' It explains when to use the tool, though it doesn't explicitly name alternative tools or state when not to use it.
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.