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Fintel Discovery — Financial Intelligence for AI Agents

by io.github.findimitrov
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Get Fund Expense Ratios — XBRL rr: Taxonomy

GetFundFees
Read-onlyIdempotent
    Retrieve expense ratios and fee breakdown for a mutual fund or ETF using
    its SEC CIK. Reads structured XBRL data filed with prospectuses using the
    SEC Risk/Return (rr:) taxonomy. Returns:
      - net_expense_ratio    — total annual cost to the investor (%)
      - gross_expense_ratio  — before waivers/reimbursements (%)
      - management_fee       — advisor/sub-advisor fee (%)
      - distribution_12b1_fee — distribution and service fee (%)
      - other_expenses       — admin, custody, transfer agent fees (%)
      - acquired_fund_fees   — fees from underlying funds, if any (%)

    All values are expressed as percentages (e.g. 0.03 = 0.03%).

    PRIMARY USE: Step 2 of fee comparison. Accepts CIKs returned by
    SearchFundsByCategory. Run for multiple funds then rank by net_expense_ratio
    ascending to find the lowest-cost option in a category.

    With include_all_classes=True (default), returns one row per share class
    per period — useful for identifying the cheapest share class of a fund.
    With include_all_classes=False, returns the single most recent value only.

    Note: Not all funds file XBRL rr: data. If this tool returns an error,
    use GetFundProfile (yfinance) as a fallback for expense ratio data.

    Source: SEC EDGAR XBRL company facts API. No API key required.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
paramsNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • changedInput schema / $defs / FundFeesParams / properties / mcp_prompt_id / default
      Previous value: -"f258bd16-f060-4e4a-a55d-221a0484866d"New value: +"05525087-35e9-4aac-b06d-6d88ce386b2e"
  2. Changed1 schema field changed
    • changedInput schema / $defs / FundFeesParams / properties / mcp_prompt_id / default
      Previous value: -"5f4db44b-e5cc-4f3a-8da3-ac591a019c81"New value: +"f258bd16-f060-4e4a-a55d-221a0484866d"
  3. Changed1 schema field changed
    • changedInput schema / $defs / FundFeesParams / properties / mcp_prompt_id / default
      Previous value: -"d9f77642-e017-4785-9150-e658c2dba3a0"New value: +"5f4db44b-e5cc-4f3a-8da3-ac591a019c81"
  4. Changed1 schema field changed
    • changedInput schema / $defs / FundFeesParams / properties / mcp_prompt_id / default
      Previous value: -"dbe99169-c071-4ed4-9ae9-8bbfb9a88ad8"New value: +"d9f77642-e017-4785-9150-e658c2dba3a0"
  5. Changed1 schema field changed
    • changedInput schema / $defs / FundFeesParams / properties / mcp_prompt_id / default
      Previous value: -"3775b46a-5aa8-4586-af57-2453c8bcd08c"New value: +"dbe99169-c071-4ed4-9ae9-8bbfb9a88ad8"
  6. Changed1 schema field changed
    • changedInput schema / $defs / FundFeesParams / properties / mcp_prompt_id / default
      Previous value: -"d81a5175-11e9-494a-baa5-71d4ffad4ab9"New value: +"3775b46a-5aa8-4586-af57-2453c8bcd08c"
  7. Changed1 schema field changed
    • changedInput schema / $defs / FundFeesParams / properties / mcp_prompt_id / default
      Previous value: -"9e7f8798-7d22-4378-b93d-179c6f8cb854"New value: +"d81a5175-11e9-494a-baa5-71d4ffad4ab9"
  8. Changed1 schema field changed
    • changedInput schema / $defs / FundFeesParams / properties / mcp_prompt_id / default
      Previous value: -"9919ff85-e960-472f-863b-3de4c5abed9f"New value: +"9e7f8798-7d22-4378-b93d-179c6f8cb854"
  9. Changed1 schema field changed
    • changedInput schema / $defs / FundFeesParams / properties / mcp_prompt_id / default
      Previous value: -"38452924-d5df-4668-b51c-d7cd5acabc09"New value: +"9919ff85-e960-472f-863b-3de4c5abed9f"
  10. Changed1 schema field changed
    • changedInput schema / $defs / FundFeesParams / properties / mcp_prompt_id / default
      Previous value: -"fa72f604-6239-428b-81df-11f07c2c8d00"New value: +"38452924-d5df-4668-b51c-d7cd5acabc09"
  11. Changed1 schema field changed
    • changedInput schema / $defs / FundFeesParams / properties / mcp_prompt_id / default
      Previous value: -"7b866f24-13ab-4e54-8d3a-f775612c393f"New value: +"fa72f604-6239-428b-81df-11f07c2c8d00"
  12. First observed

TDQS

A4.3/5.0
Behavior4/5

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

With readOnly/idempotent/non-destructive annotations already covering the safety profile, the description adds real behavioral context: the data source and API-key-free access, the enumeration of returned fields, the include_all_classes row-multiplication behavior, and the error condition when no XBRL rr: data is filed. It stops short of stating latency, caching, or CIK-not-found behavior, so not a full 5.

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?

Front-loaded with the core action and a clean bulleted field list, then use-case and notes. Most sentences earn their place, though the return-field enumeration overlaps with the existing output schema and adds length the agent may not need.

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 read-only, output-schema-backed tool the description is near-complete: workflow position, data source, defaults, and fallback are all covered. The main gap is that the ancillary session/filter parameters bundled in the schema go unmentioned, leaving the agent to infer their role.

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?

The description explains the semantics of cik (zero-padding handled) and include_all_classes (all share classes vs. single latest value) in prose beyond the schema. However, several declared parameters (wholesaler_ids, exclude_fillers, source_resource_id, additional_display_fields, optional_additional_filters) are never addressed, and the reported schema coverage is low, so the description does not fully compensate.

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 (retrieve expense ratios and fee breakdown for a mutual fund/ETF) and identifies the exact data source (SEC XBRL rr: taxonomy via CIK). It clearly distinguishes itself from siblings by naming GetFundProfile as the fallback and SearchFundsByCategory as the feeder.

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?

Explicitly frames the tool as 'Step 2 of fee comparison', tells the agent to accept CIKs from SearchFundsByCategory, run across multiple funds, and rank by net_expense_ratio ascending. It also names the when-to-switch condition: if XBRL rr: data is missing, use GetFundProfile (yfinance) instead.

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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