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Signal8 MCP Server

Official

Get Institution Filings

get_institution_filings
Read-only

Retrieve a paginated list of 13F filings for an institution using its SEC CIK number.

Instructions

Get the list of 13F filings for an institution by CIK, with pagination.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
cikYesSEC CIK number of the institution
limitNoMaximum results to return (default: 20, max: 50)
offsetNoOffset for pagination (default: 0)

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
dataNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

A3.8/5.0
Behavior4/5

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

Annotations provide readOnlyHint=true, so the agent knows it is a safe read operation. The description adds that it returns a list of filings with pagination. No contradictions or missing behavioral context that is not already covered by annotations.

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?

The description is a single sentence front-loading the core purpose and key features. No extraneous text.

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?

Given the tool's simplicity and the presence of annotations, input schema with 100% coverage, and an output schema, the description is sufficiently complete. It does not mention that 13F filings are quarterly, but that is not critical for selection.

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% with adequate descriptions for all parameters. The description adds minimal value beyond that by mentioning pagination. 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?

The description clearly states the verb 'Get', the resource 'list of 13F filings', the key parameter 'by CIK', and the feature 'with pagination'. It distinguishes itself from siblings like get_institution_holdings or get_institution_activity by specifying it is for filings.

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?

No guidance is provided on when to use this tool versus its many siblings (e.g., get_institution_holdings, get_institution_activity). The agent would have no context to choose this tool over alternatives.

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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