Monitor
A Claude Code tool, read out of the shipped bundle. It has been in the build since v2.1.310, including the newest one read.
The Bash tool's don't-poll guidance now appears only when a capability and background-task check both pass.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.257.
In the changelogs
3Releases whose published page names Monitor.
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v2.1.302
Claude Code run as an MCP server can no longer fork subagents
When Claude Code serves its tools to another program over MCP, it now turns off fork subagents and can refuse a call it already reported as not started
found in this entry's text
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v2.1.257
Bash tool: long-running background wait guidance reworded and gated by sandboxing capability
The Bash tool's don't-poll guidance now appears only when a capability and background-task check both pass.
named in this entry
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v2.1.257
New login/credentials telemetry store
The Bash prompt's Monitor-tool tips are now conditioned on capability and background-task support checks.
named in this entry
First cited
0No release's published evidence quotes this name. The ledger indexes the Evidence lines of every changelog on this site, so this says nobody here has ever quoted it; it says nothing about how old the name is.
Presence across releases
1Build by build
3One row per release since the first build this name was read out of. Absent means the build was read and the name was not in it, never mined means no bundle for that release was ever archived, and a declared type or a default is only ever what that release's own bundle stated.
Read out of the published npm bundle release by release, and out of Anthropic's own documentation as this site captured it. Nothing on this page is a description anybody here wrote about what the tool does. All tools.