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by net.crawlora
OverviewDiscussionsAdmin

substack_publication_recommendations

Read-only

List the publications one Substack publication recommends to its own readers, as a publication-to-publication graph. Useful for discovering publications beyond the 675-per-category ceiling on substack_category. publication_id is the numeric id returned by substack_publication, substack_category, or substack_user.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "publication_id": "<publication_id>"
    },
    "name": "substack_publication_recommendations"
  }
}

Input Schema

NameRequiredDescriptionDefault
publication_idYesRequired numeric publication id, as returned by /substack/publication, /substack/category, or /substack/user.

Output Schema

NameRequiredDescriptionDefault
dataYesThe tool result payload (shape varies per tool; see each tool's docs resource).

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observed

TDQS

A4.5/5.0
Behavior4/5

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

Annotations already declare readOnlyHint and openWorldHint, so the safety profile is covered. The description adds the graph semantics and the category-ceiling context, which is real behavioral context, though it doesn't discuss pagination or result limits.

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

Conciseness5/5

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

Three short sentences, front-loaded with the core purpose, followed by the differentiator and the parameter hint. Nothing is wasted.

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

Completeness5/5

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

One required parameter fully documented, output schema present so return values need not be explained, and the sibling-routing rationale is included. Nothing an agent needs in order to call it correctly is missing.

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%, and the description's only parameter note (numeric id returned by substack_publication, substack_category, or substack_user) repeats the schema's own wording nearly verbatim. No additional syntax or formatting detail, so baseline 3 applies.

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

Purpose5/5

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

States a specific verb (List) and resource (publications one Substack publication recommends to its own readers), and clarifies the output shape as a publication-to-publication graph. An agent can distinguish it from substack_category or substack_publication_posts without opening the schema.

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

Usage Guidelines5/5

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

Gives an explicit motivation for choosing this tool: discovering publications beyond the 675-per-category ceiling on substack_category. This names the sibling it competes with and the condition that selects it, which is exactly the routing guidance an agent needs.

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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