AgentIndex x402

Summarize

summarize

Read-onlyIdempotent

Summarize a URL, raw text or HTML at the length you request - short, medium or long - with the source noted. Neutral and factual, no invented facts. Try GET /summarize/sample. Part of the AgentIndex content kit (pdf, web-read, extract, summarize, detect-language) - see GET /capabilities.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`url`	No	URL to fetch and summarize. Provide exactly one of url, text or html.
`html`	No	Raw HTML to summarize. Provide exactly one of url, text or html.
`text`	No	Raw text to summarize. Provide exactly one of url, text or html.
`length`	No	Requested summary length - short (~2 sentences), medium (~1 paragraph), long (~3-4 paragraphs). Defaults to medium.	medium

Output Schema

TableJSON Schema

Name	Required	Description
`length`	Yes
`sources`	No	Source URL(s) the summary was drawn from, when a URL was given.
`summary`	Yes
`x402_receipt`	No	Billing and provenance receipt for this call.

Schema Changelog

Changes observed during successful MCP inspections.

Changed5 schema fields changedSep 27, 2026

addedInput schema / properties / html / description

Added value: +"Raw HTML to summarize. Provide exactly one of url, text or html."

addedInput schema / properties / length / description

Added value: +"Requested summary length - short (~2 sentences), medium (~1 paragraph), long (~3-4 paragraphs). Defaults to medium."

addedInput schema / properties / text / description

Added value: +"Raw text to summarize. Provide exactly one of url, text or html."

addedInput schema / properties / url / description

Added value: +"URL to fetch and summarize. Provide exactly one of url, text or html."

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "properties": {
+    "length": {
+      "type": "string"
+    },
+    "sources": {
+      "description": "Source URL(s) the summary was drawn from, when a URL was given.",
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "summary": {
+      "type": "string"
+    },
+    "x402_receipt": {
+      "description": "Billing and provenance receipt for this call.",
+      "type": "object"
+    }
+  },
+  "required": [
+    "summary",
+    "length"
+  ],
+  "type": "object"
+}

AddedSep 6, 2026

TDQS

B3.2/5.0

Behavior3/5

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

Annotations already declare readOnlyHint, idempotentHint and openWorldHint, so the safety profile is covered. The description adds genuine output-behavior context ('neutral and factual, no invented facts', 'source noted'), but does not mention rate limits, truncation, or failure modes for unfetchable URLs.

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?

Two tight sentences that front-load the core capability before the quality claim and the discoverability pointers. The sample endpoint and capabilities reference are mildly promotional but still earn some navigational value.

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 a full output schema and rich annotations, the description need not explain return values. It adequately conveys input flexibility, length control, and output tone; only the absence of sibling-routing guidance 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.

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 the mutually-exclusive url/text/html inputs and the length enum values with token estimates. The description only restates the short/medium/long choices, adding nothing beyond the structured data.

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?

States a specific verb (summarize) and the exact resource types it accepts (URL, raw text, HTML), plus the length dimension. It situates itself in the content kit alongside pdf/web-read/extract, which helps orientation, but it does not explicitly contrast its role against those siblings the way a routing-ready definition would.

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?

Offers a 'Try GET /summarize/sample' pointer and names the larger kit, but gives no when-to-use or when-not-to-use guidance relative to siblings like extract_structured or read_web_page. An agent must infer which of these content tools fits a given input.

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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