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Playerbs1

substack-publisher-mcp

by Playerbs1

get_post_stats

Retrieve engagement metrics for a Substack post using its URL slug, including opens and clicks.

Instructions

Get engagement statistics for a specific post by its URL slug. Returns metrics like opens, clicks, and other engagement data.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
publicationNoPublication name (e.g., 'ny', 'la'). Required if multiple publications are configured.
urlSlugYesThe URL slug of the post (from list_posts results or the post URL).
Behavior2/5

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

No annotations are provided, so the description must compensate. It mentions return metrics but fails to disclose read-only behavior, authentication needs, error handling, or response format, leaving significant gaps.

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?

The description is two short sentences, front-loading the core purpose and listing example metrics without extraneous detail.

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

Completeness3/5

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

For a simple stats tool with no output schema, the description provides adequate high-level purpose but lacks behavioral details and usage context relative to siblings, leaving some ambiguity.

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%, providing clear parameter definitions. The description adds minimal value beyond restating the schema, earning the baseline score of 3.

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?

The description clearly states the tool retrieves engagement statistics for a specific post using a URL slug. This distinct purpose differentiates it from siblings like get_post (content) and list_posts (listing).

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

Usage Guidelines3/5

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

The description implies usage by indicating the required urlSlug from list_posts, but no explicit guidance on when to use versus alternatives or any preconditions.

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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