Bob Research Tools

bob_summarize

Read-only

Condenses one public web page into an 80-word summary with up to 4 key points, returned as {url, summary, key_points}, usually in 3 to 6 seconds. Use it when you want the gist; use bob_extract to get the page's own text instead. Pages that need a login cannot be read. Each call needs an x402 payment; if the page cannot be read in time or the URL is invalid, it fails and you are not charged.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`url`	Yes	Public http or https address of the page to summarize; private or local addresses are refused.

Output Schema

TableJSON Schema

Name	Required	Description
`url`	Yes	The page that was summarized.
`summary`	Yes	About 80 words.
`key_points`	No	Key points from the page.

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 3, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "additionalProperties": true,
+  "properties": {
+    "key_points": {
+      "description": "Key points from the page.",
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "summary": {
+      "description": "About 80 words.",
+      "type": "string"
+    },
+    "url": {
+      "description": "The page that was summarized.",
+      "type": "string"
+    }
+  },
+  "required": [
+    "url",
+    "summary"
+  ],
+  "type": "object"
+}

Changed1 schema field changedOct 3, 2026

addedInput schema / properties / url / description

Added value: +"Public http or https address of the page to summarize; private or local addresses are refused."

First observedOct 3, 2026

TDQS

A4.7/5.0

Behavior5/5

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

Annotations only cover read-only/open-world safety, but the description adds substantial behavioral context: expected latency (3-6s), the x402 payment requirement per call, the no-charge guarantee on failure, and the login-page restriction. These are exactly the operational facts an agent needs before invoking.

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?

Front-loads what it produces and how fast, then usage routing, then constraints and billing. Every clause carries information; no filler or repetition of the name.

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?

Given an output schema exists, return values need not be explained, yet the tool still conveys return shape briefly. Payment, failure, latency, and access limitations are all covered, leaving nothing an agent needs 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?

With one parameter and 100% schema description coverage, the schema already documents the url argument including the private/local refusal. The description only adds that invalid URLs cause failure without charge, which is behavioral rather than parameter semantics. Baseline 3 is appropriate.

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?

Specific verb (condenses) plus resource (one public web page) and concrete output shape (80-word summary, up to 4 key points, {url, summary, key_points}). It also names bob_extract as the contrasting sibling, so an agent can distinguish them without opening schemas.

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?

Explicitly states when to use it ('when you want the gist') and names the alternative with its own condition ('use bob_extract to get the page's own text instead'). The exclusion of login-required pages further narrows applicability.

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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