SAP MCP Server

Fear & Greed Index

sap_perp_fear_greed

Fetch the Crypto Fear & Greed Index from alternative.me (free, no API key). Returns current value (0-100), classification (Extreme Fear to Extreme Greed), historical values (yesterday, last week, last month), and a risk_on/risk_off recommendation. Use this as a market sentiment overlay before opening positions. Extreme Fear (<25) can indicate capitulation (contrarian bullish). Extreme Greed (>75) can indicate euphoria (contrarian bearish).

SAP MCP execution guidance: Intent: SAP MCP tool workflow. Pricing: free; call directly without x402. Routing: free hosted call; call directly and keep it small/exact when possible. Signer boundary: hosted reads/builders never receive keypair bytes; value-moving results must be finalized locally when signing is required.

Input Schema

TableJSON Schema

Name	Required	Description	Default
No arguments

Output Schema

TableJSON Schema

Name	Required	Description	Default
`content`	Yes	MCP content blocks returned to the caller.
`isError`	No	True when the tool result represents an application-level error.

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedJul 29, 2026

changedInput schema / description

Previous value: -"Fear & Greed Index input schema. Intent: SAP MCP tool workflow. Pricing: paid read-premium; estimate first, then use sap_payments_call_paid_tool when the runtime cannot replay x402 natively. Routing: paid hosted call; call sap_estimate_tool_cost first, then use sap_payments_call_paid_tool if the runtime cannot handle x402 natively. Signer boundary: hosted reads/builders never receive keypair bytes; value-moving results must be finalized locally when signing is required. Use exact field names from this schema; do not guess aliases or include private key material."New value: +"Fear & Greed Index input schema. Intent: SAP MCP tool workflow. Pricing: free; call directly without x402. Routing: free hosted call; call directly and keep it small/exact when possible. Signer boundary: hosted reads/builders never receive keypair bytes; value-moving results must be finalized locally when signing is required. Use exact field names from this schema; do not guess aliases or include private key material."

AddedJul 29, 2026

TDQS

A4.7/5.0

Behavior5/5

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

Discloses beyond annotations: free, no API key needed, returns specific data, and includes SAP MCP execution guidance (pricing, routing, signer boundary). No contradictions with annotations; readOnlyHint=false is not contradictory since the description does not claim read-only.

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 main purpose, but includes somewhat verbose SAP MCP execution guidance that may not be essential for an AI agent. Could be more concise while retaining all key info.

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

Completeness5/5

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

Complete for a simple fetch tool: covers purpose, usage, return values, and even technical routing details. Output schema exists so return format is already defined.

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

Parameters5/5

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

No parameters in schema; description correctly notes no input needed. Schema coverage is 100% (empty), so no additional parameter description required.

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?

Clearly states it fetches the Crypto Fear & Greed Index, specifying the source (alternative.me), that it's free and requires no API key, and lists the return data (current value, classification, historical values, recommendation). Differentiates from sibling tools by being a market sentiment overlay.

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

Usage Guidelines4/5

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

Provides explicit guidance: 'Use this as a market sentiment overlay before opening positions' and offers contrarian interpretations for extreme values. Lacks explicit when-not-to-use or comparison to alternatives, but the context is clear enough for an agent.

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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