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Compare Agents

compare_agents

Read-onlyIdempotent

Put 2 or 3 listings side by side, as the site's /compare page does. For each listing: the facts that set it apart from the others ("Only one with a CLI", "No auth required", "Most skills (12)"). Then one row per field, with each listing's value by slug: what it is, provider, official vendor, verified, access, auth, MCP server, CLI install, API base URL, skills, streaming, push, categories, tags, listed since. A row where every listing agrees has same: true. Facts from the listings' own data, never a verdict. A curated comparison of the same listings adds its intro line. Unknown or repeated slugs, and any past 3, are left out with a note.

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": {
      "slugs": "<slugs>"
    },
    "name": "compare_agents"
  }
}

Input Schema

Name	Required	Description	Default
`slugs`	Yes	Listing slugs to compare, in column order: 2 or 3, e.g. ["deepgram", "assemblyai"]

Output Schema

Name	Required	Description
`url`	Yes	The comparison on the site
`rows`	Yes
`intro`	Yes	A curated comparison's editorial line; null for any other mix
`notes`	Yes	Named listings that were left out, and why
`title`	Yes
`agents`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed2 schema fields changedNov 2, 2026

removedOutput schema / properties / agents / items / properties / featured

Removed value: -{
-  "description": "Featured: set only by the maintainer. With no search text, results list featured listings first, then A→Z; with search text, results are ranked by relevance and equal scores keep that featured-first order.",
-  "type": "boolean"
-}

changedOutput schema / properties / agents / items / required

Previous value: -[
-  "name",
-  "slug",
-  "url",
-  "iconUrl",
-  "description",
-  "provider",
-  "categories",
-  "accessMethods",
-  "verified",
-  "official",
-  "featured",
-  "authType",
-  "setsApart"
-]New value: +[
+  "name",
+  "slug",
+  "url",
+  "iconUrl",
+  "description",
+  "provider",
+  "categories",
+  "accessMethods",
+  "verified",
+  "official",
+  "authType",
+  "setsApart"
+]

AddedNov 2, 2026

TDQS

A4.3/5.0

Behavior5/5

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

Beyond readOnlyHint, idempotentHint, and destructiveHint=false, the description explains the comparison structure, that facts come from listing data and never a verdict, and that curated comparisons add an intro line. It also discloses edge behavior: unknown or repeated slugs and anything past 3 are omitted with a note. That is substantial behavioral context beyond the annotations.

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 front-loaded with the core action and then moves cleanly to output structure, edge cases, and handling rules. The long field list is necessary for describing the comparison rows and every sentence carries useful information. There is no redundant restatement of the name or annotations.

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?

With an output schema present, the description need not explain return values, and it still gives enough behavioral detail to invoke the tool correctly. However, the schema allows minItems=1 while the description says 2 or 3 listings, leaving the single-slug case ambiguous. That minor gap keeps it from being fully complete.

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

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100% and the single slugs parameter already documents column order and the 2-3 example. The description adds meaningful semantics by specifying that unknown or repeated slugs and entries past 3 are left out with a note, which is not captured in the schema. It does not fully explain what happens if only one slug is supplied despite minItems=1, so this is not a 5.

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 states a specific verb and resource: put 2 or 3 listings side by side as the /compare page does. It is clear what the tool produces, including facts and field rows. It does not explicitly name a sibling tool such as alternatives_to or get_agent to differentiate itself, so it falls short of a 5.

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

Usage Guidelines4/5

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

The usage context is clear: this is for side-by-side comparison of 2 or 3 listings, not single-listing lookup or search. The description gives a concrete scope and output shape, but it does not state when to use it instead of a sibling such as alternatives_to, nor does it list exclusions.

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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