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substack_category

Lists publications ranked in a Substack category, returning one page of a public leaderboard with subscriber signals and subscription options for paid or free rankings.

Instructions

List the publications ranked in one Substack category. Returns one page of a category's public publication leaderboard. Each row carries the publication's subscriber signals and its full subscription offering (web plans with multi-currency pricing, App Store plans, and per-tier benefits). Subscriber totals are published to roughly three significant figures and are opt-in per writer; paid subscriber figures are only ever buckets. Upstream serves 25 publications per page and accepts pages 0-26, so at most 675 publications are reachable per category and type.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
pageNoZero-based page, 0-26
typeNoRanking to read
category_idYesCategory id from /substack/categories. Numeric for 32 categories, or the string podcast.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Addedv1.17.5

TDQS

A3.5/5.0
Behavior4/5

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

With no annotations, the description carries the full burden and does disclose key behaviors: subscriber totals are opt-in and rounded to three significant figures, paid figures are buckets, and upstream serves 25 per page with a max page range. This gives an agent important expectations about data quality and pagination, though it omits auth/rate-limit details.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is three sentences, front-loaded with the core purpose and then detailed with useful constraints. It is efficient and avoids fluff, though it could be slightly tighter by omitting the exact max publication count.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given three parameters and no output schema, the description covers the main operational details: pagination, data precision, and row content. It is reasonably complete, though it does not mention any error conditions or the possibility of empty results, which would be useful for an agent.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

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 all parameters. The description adds context about pagination limits and max reachable publications, but this is more about tool behavior than parameter semantics. It does not materially enhance the meaning of individual parameters beyond the schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool lists publications ranked in a Substack category and returns one page of a category's public leaderboard. It specifies the resource and action precisely, but does not explicitly differentiate from sibling tools like substack_leaderboard, so a slight deduction for not naming alternatives.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides no guidance on when to use this tool versus other Substack tools, such as substack_leaderboard or substack_explore. It only explains internal pagination limits, not when this is the appropriate choice.

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

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