Frontier Signal MCP

Latest public brief

latest_brief

Read-onlyIdempotent

Retrieve the public Frontier Signal brief markdown for a date, or omit the date for the current public brief; missing dates are reported and no brief is synthesized.

Instructions

Return the public Frontier Signal brief markdown for a date.

Only the public cut is served. Gated watchlist sections are stripped if present. Missing dates are reported; a brief is never synthesised.

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": {
    "arguments": {},
    "name": "latest_brief"
  }
}

Input Schema

Name	Required	Description	Default
`observed`	No	Brief date YYYY-MM-DD. Omit for the latest public brief.

Output Schema

Name	Required	Description	Default
`path`	No
`message`	No
`markdown`	Yes
`observed`	Yes
`public_only`	No

Schema Changelog

Changes observed during successful MCP inspections.

First observedv0.2.0Nov 6, 2026

TDQS

A3.7/5.0

Behavior4/5

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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, closed-world), and the description adds genuinely new behavioral facts: gated watchlist sections are stripped, missing dates are reported as errors, and content is never synthesised. That tells the agent the response may omit sections it might expect, which is not derivable from the annotations.

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?

Four short sentences, front-loaded with the core action, with no filler. 'Only the public cut is served' and 'Gated watchlist sections are stripped' overlap somewhat, making one of them partially redundant.

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 single-parameter read tool with an output schema and full annotation coverage, the description covers the key edge cases (missing date, stripped gated sections). The only meaningful omission is how to obtain a valid date, which would route the agent to the list_observed_dates sibling.

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 coverage is 100% and the single parameter already documents format (YYYY-MM-DD) and the omit-for-latest default. The description only restates 'for a date', adding no new meaning about the parameter beyond the schema, so the baseline 3 applies.

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 pairs a specific verb and resource ('Return the public Frontier Signal brief markdown for a date') and pins the scope ('Only the public cut is served'), so an agent knows exactly what it gets back. It stops short of naming a sibling such as list_observed_dates as the way to discover valid dates, so sibling differentiation is implied rather than stated.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Usage is implied rather than prescribed: the agent can infer 'call this to read a brief' and the schema says to omit the date for the latest one. There is no explicit routing guidance, e.g. that list_observed_dates should be called first to find a valid date, and no statement of when not to use it.

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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