MCP tool
A callable function an MCP server allows a model to request.
What MCP tool means
Tool metadata describes expected use; the server remains responsible for validation and access control.
Where MCP tool comes up on this site
- Do AI agents stop before acting on a lookalike? We tested 4Poisoned tool (4 and 4): an MCP tool whose description carries hidden instructions ( tool poisoning ).
Terms this definition uses
Related terms in Agents and protocols
How autonomous agents plan, remember, call tools and talk to each other, including MCP and A2A, and where each step can go wrong.
OpenSearch description · traceparent · JSON Schema · protected-resource metadata · token audience · PKCE · refresh token · default scope request · tool poisoning · tool lockfile · MCP rug pull · tool shadowing · MCP preflight · agent manifest · stapled verdict · verdict over DNS · agentic web · preflight · decision receipt · receipt header · action assurance · resolve answer · freshness window · AI agent · Agent loop · Planner · Executor · Agent memory · Working memory · Long-term memory · Episodic memory · Semantic memory · Agent orchestration · Multi-agent system · Agent handoff · Delegation · Tool result · Tool schema · Tool description · Tool selection · Tool permission · Human-in-the-loop · Human-on-the-loop · Approval gate · Agent sandbox · Agent identity · Agent authorization · Agent discovery · Capability negotiation · MCP server · MCP client · MCP host · MCP resource · MCP prompt · MCP transport · JSON-RPC · A2A protocol · A2A client · A2A server · Agent skill · Agent task · Agent artifact · WebMCP · A2A
Questions about MCP tool
What is MCP tool?
A callable function an MCP server allows a model to request.
Which area of the glossary does MCP tool belong to?
Agents and protocols: How autonomous agents plan, remember, call tools and talk to each other, including MCP and A2A, and where each step can go wrong.
← MCP prompt · MCP transport →
See it in the full glossary · 772 terms across 19 areas.
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