Eleven market-data tools discovered
The surface covers ticker info, news, search, screeners, price history, financials, options, and holders.
evidence/trust5/2026-07-03-mcp-pilot.json
MCP serverPublished
Yahoo Finance MCP Server (yfmcp)
The Yahoo Finance MCP server passed a real smoke test: it returned live company data for AAPL and correct symbol search results. The score is moderate because the server rides an unofficial Yahoo Finance data path with no service agreement, so data continuity and accuracy cannot be assured for decision-grade use.
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Claim tested
Can the public yfmcp server return live ticker information and symbol search results over MCP without credentials?
Evaluator panel
Protocol harnessData-quality reviewerOperator skeptic
Evidence reviewed
Live ticker info returned
yfinance_get_ticker_info for AAPL returned company records including address, industry, and website consistent with Apple Inc.
evidence/trust5/2026-07-03-mcp-pilot.json
Symbol search resolved correctly
A quotes search for "Apple" returned AAPL on NASDAQ as the top equity result with exchange metadata.
evidence/trust5/2026-07-03-mcp-pilot.json
Test setup
- Started yfmcp==0.12.0 over MCP stdio via uvx.
- Used the official MCP client SDK to list tools, request ticker info for AAPL, and search quotes for "Apple".
- Stored the full tool-call evidence in evidence/trust5/2026-07-03-mcp-pilot.json.
Strengths
- Broad market-data surface with zero configuration in the tested run.
- Returned structured, field-rich payloads an agent can parse.
- Search results carried exchange and type metadata for disambiguation.
Failure modes
- The underlying yfinance library uses unofficial Yahoo endpoints that can change or block access without notice.
- Financial data served without freshness or accuracy guarantees can mislead downstream automated decisions.
- Screeners, options, and financials tools were not exercised in this test.
What would improve the score
- Surface data timestamps and staleness indicators in every payload.
- Document upstream failure behavior when Yahoo throttles or changes endpoints.
Limitations
- This was an unsolicited smoke test of the public package, not a source audit.
- Two read-only calls on one ticker; data accuracy was sanity-checked, not reconciled against an authoritative feed.
Visible dissent
- The data-quality reviewer withheld points because decision-grade finance data needs a contractual source.
- The harness reviewer noted both tested calls returned coherent, correctly attributed data.
Right of reply
No vendor reply has been requested or published as of 2026-07-03. SilentCritique will publish factual corrections or a right of reply through the corrections process.
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