Robert Blust

fetch

Read-only

One entity's page as written. Use to quote or display the source; for structured fields and references use get_entity. Input: id or address, from search, list_entities or any reference. Returns id, title, type, url and text, the Markdown source. Takes no name: search with match "name" finds the id.

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": {
      "id": "<id>"
    },
    "name": "fetch"
  }
}

Input Schema

Name	Required	Description	Default
`id`	Yes

Output Schema

Name	Required	Description	Default
`id`	Yes
`url`	Yes
`text`	Yes
`type`	Yes
`model`	Yes
`title`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed7 schema fields changedSep 21, 2026

changedOutput schema / additionalProperties
```
Previous value: -{}New value: +false
```
addedOutput schema / properties / id
```
Added value: +{
+  "type": "string"
+}
```
addedOutput schema / properties / text
```
Added value: +{
+  "type": "string"
+}
```
addedOutput schema / properties / title
```
Added value: +{
+  "type": "string"
+}
```
addedOutput schema / properties / type
```
Added value: +{
+  "type": "string"
+}
```

addedOutput schema / properties / url

Added value: +{
+  "type": [
+    "string",
+    "null"
+  ]
+}

changedOutput schema / required

Previous value: -[
-  "model"
-]New value: +[
+  "id",
+  "title",
+  "type",
+  "url",
+  "text",
+  "model"
+]

First observedSep 17, 2026

TDQS

A4.7/5.0

Behavior4/5

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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds a real behavioral constraint ('takes no name: search with match "name" finds the id') plus the returned shape; the return fields are partly redundant with the output schema, keeping this from a 5.

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 front-loaded sentences, purpose first, alternative second, input/return details last. Every clause carries information; nothing is padding.

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?

For a single-parameter read tool with annotations and an output schema, the description covers everything the agent needs: what it returns, how to obtain the id, the name-vs-id caveat, and the alternative tool. No material gaps.

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 0%, so the description must carry the parameter burden, and it does: `id` is described as an entity id or address, with concrete sources (search, list_entities, references). It stops short of format/syntax detail for the id string.

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 and resource: retrieving one entity's page 'as written' (the raw source). It explicitly distinguishes itself from the sibling get_entity ('for structured fields and references use get_entity'), so an agent can route correctly without opening either 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 explicit when-to-use ('to quote or display the source') and when-not ('for structured fields and references use get_entity'), and names the alternative. It also tells the agent where valid input comes from (search, list_entities, any reference).

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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