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Quick answer: MCP tool annotations let a server declare whether a tool is read-only, destructive, idempotent, or open-world, so an agent can decide whether to call it freely or ask
Read articleQuick answer Changing an MCP tool's input schema is a breaking change for the agents that already call it, even though there is no compiled client to fail
Read articleQuick answer When an agent chains API calls, it is tempted to reuse an identifier it captured earlier in the workflow rather than re-reading the resource. That is fine for
Read articleQuick answer A tool call that an agent cancels is not the same as a request that never happened. By the time the MCP client sends a cancellation, the server
Read articleQuick answer Publishing an MCP server without an end-to-end test is how you ship a tool that looks correct in the registry and fails the first time an agent calls
Read articleQuick answer When an agent chains several API calls into one workflow, a failure midway leaves the system in a partial state that the agent is bad at reasoning about.
Read articleQuick answer A long-running MCP tool that gives no feedback turns the agent into a black box. The agent cannot tell whether the tool is working, has stalled, or should
Read articleQuick answer: An MCP tool is a piece of code that can read and act on real data, so it deserves the same security review as any service you deploy.
Read articleQuick answer: If your agent has a working MCP tool for an API but the model still hand-writes a fetch, the failure is usually one of three things: the tool&
Read articleQuick answer: An MCP tool should return a structured, machine-readable error when something goes wrong, not let a raw exception bubble up. The agent calling the tool has to decide
Read articleQuick answer: When an MCP server runs through a hosted registry, the operator's view of what the server actually did is limited to whatever logs and metrics the
Read articleQuick answer: An AI coding assistant like Cursor will happily generate a request that looks correct in the editor but drifts from the actual API contract, because it is working
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