ProgressReporter

API reference · Markdown

struct ProgressReporter : struct ProgressReporter

struct [source] ¶

struct [source] ¶

struct ProgressReporter

Bases:

• Sendable
• SendableMetatype

Says that a call is still running, to a client that asked to be told.

A wait can hold a request for a minute, and without this the client cannot tell that from a server that has died — so it either shows nothing or gives up. MCP's answer is notifications/progress, which a client opts into by putting a progressToken in a request's _meta. Measured against the Codex CLI, which sends one on every tools/call.

Silent when no token was sent: an unsolicited notification is a protocol error, not a courtesy.