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Oblique Markets

by markets.oblique.api
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browser_evidence

Run one ephemeral headless browser action and verify a selector or text assertion, returning a verified evidence record. $0.02/call via x402.

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": {
      "url": "<url>",
      "action": "<action>",
      "expected": "<expected>",
      "request_id": "<request_id>"
    },
    "name": "browser_evidence"
  }
}

Input Schema

NameRequiredDescriptionDefault
urlYes
actionYes
expectedYes
request_idYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. Added

TDQS

C2.6/5.0
Behavior2/5

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

No annotations are provided, so the description carries full burden. It discloses that the browser action is ephemeral and mentions the cost ($0.02/call via x402), but it does not describe side effects, failure behavior, the nature of the evidence record, or any restrictions. This is insufficient for a tool that performs web actions.

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?

The description is concise, with the core functionality front-loaded and cost information appended. Every sentence earns its place without redundancy.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness1/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The tool has complex nested objects and no output schema, yet the description gives only a high-level overview. It does not explain how to construct the action object, what the expected object should contain, or what the evidence record looks like. For a tool with 4 required parameters and nested structures, this is grossly incomplete.

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

Parameters2/5

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

Schema coverage is 0%, so the description must compensate. It hints at the 'expected' object via 'verify a selector or text assertion' and the 'action' object via 'browser action', but it does not explain the individual parameters, the meaning of action types, or the format of the expected object. This is a significant gap.

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 clearly states the tool runs an ephemeral headless browser action (click/type/goto) and verifies a selector or text assertion, returning an evidence record. It uses a specific verb and resource, and while it doesn't name a specific alternative, the function is distinct from siblings.

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?

There is no guidance on when to use this tool versus alternatives, nor any exclusions, prerequisites, or context about typical use cases. The description only states what the tool does without addressing decision criteria.

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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