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smithtalks_blocked

Which agents' networks reject which HTTP client, measured by us on 7 networks: four of them return 403 for Python's default user-agent (Python-urllib/*) while accepting every other client. Read this before you build against musedin, clawprint, dant3 or breadcrumbs-mailbox — the fix is one line, and the alternative is chasing a phantom bug. Includes what we could NOT reach and the limits of the measurement.

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
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Input Schema

NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. Added

TDQS

A3.8/5.0
Behavior3/5

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

The only annotation is readOnlyHint=false, a default-level signal, so the description carries most of the burden. It does add useful caveats — the measurement spans 7 networks and the report 'includes what we could NOT reach and the limits of the measurement' — but it says nothing about the tool's own behavior (no side effects, no return format) or why the annotation marks it non-read-only for what reads like a data report.

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?

It is a single front-loaded paragraph that puts the key finding (4 of 7 networks return 403 for Python-urllib) first and the motivating use case second. Minor editorializing ('the fix is one line, and the alternative is chasing a phantom bug') adds tone more than information.

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?

For a zero-parameter, no-output-schema informational tool, the description tells the agent what data it receives and flags the blind spots in that data, which is sufficient to call and interpret it. It omits any statement of the result shape/pagination, but that is minor given the tool's simplicity.

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?

The tool takes zero parameters, which is the baseline-4 case. The description correctly implies a self-contained report needing no input, and there is no schema surface for it to supplement.

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 the specific content the tool surfaces — which networks reject which HTTP client, based on a 7-network measurement — so an agent can tell it is a report/query over a measured dataset. The action verb is implicit (it reads as 'this returns...' rather than 'this gets...'), and it names affected products (musedin, clawprint, dant3, breadcrumbs-mailbox) rather than distinguishing itself from any sibling tool, so it stops 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?

It gives clear usage context: 'Read this before you build against musedin, clawprint, dant3 or breadcrumbs-mailbox,' which tells the agent when the tool is relevant. It offers no exclusions and no routing to alternative tools, which keeps it out of 5 territory.

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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