mcp
A Claude Code CLI flag, read out of the shipped bundle. No mined inventory carries it: everything below comes from what this site has written about it.
Internal build versions get trimmed before metrics are sent, so daily builds report one value.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.219.
In the changelogs
29Releases whose published page names mcp.
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v2.1.309
Claude Test's explorer agent may no longer open credential files or leave the project
The Claude Test plugin's explorer agent is now told to use only Read, Grep and Glob, avoid credential files and stay inside the project folder
found in this entry's text
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v2.1.309
Built-in Claude Test plugin can do more, with tighter rules for its explorer
The bundled Claude Test plugin now handles the tool.call hook and more host calls, and its explorer is told to stay away from credential files
found in this entry's text
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v2.1.304
/usage now says when you can try again after a rate limit
When /usage is rate limited, its message now shows when it can be tried again instead of saying "try again in a moment"
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v2.1.286
MCP log message about saving server checks reworded
A log message about failing to save remembered MCP server checks now uses a shorter prefix and describes a different retry
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v2.1.285
New names for MCP connections and appending to a session
Three new names appear for connecting to MCP, appending to a session and a plain MCP server call, next to existing ones
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v2.1.284
claude mcp addis refused when managed settings allow only plugin MCP serversIf managed settings restrict MCP servers to plugins,
claude mcp addnow stops with an error instead of adding a server that never loadsfound in this entry's text
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v2.1.268
Plugin status listing now flags org-required MCP plugins
Plugin status now shows "required by your org" when a loaded MCP plugin is mandated by org settings
named in this entry
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v2.1.265
Cursor IDE config import (
/import)/import can now bring in configuration from Cursor IDE, not just Codex and Gemini CLI
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v2.1.265
Artifact-type-instructions prompt block gained size-scrubbing and page-content helpers
Artifact type-instructions prompts gain new helpers for verifying and trimming embedded page content
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v2.1.257
New MCP connector-declaration error for locally-configured servers
Naming a locally-configured MCP server where a claude.ai connector is expected now gives a distinct host_unavailable error.
found in this entry's text
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v2.1.248
Chat relay artifact backstop retirement is now unconditional
A chat relay flag no longer does anything; entrypoint alone decides that path.
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v2.1.246
Per-class memory caps on spawned processes, wired through but off for everything except Bash
Memory limits now reach npm, git, tmux, LSP, MCP and hooks, but everything except Bash is excluded.
found in this entry's text
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v2.1.246
Stdio MCP servers start through a shared launch helper that can defer or cap them
Stdio MCP servers now launch through a shared helper that can rewrite, defer or cap them.
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v2.1.242
Plugin modules with a
$API that can hook events and redraw the terminal UIPlugins can install code that intercepts tool calls and repaints parts of the terminal interface.
found in this entry's text
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v2.1.239
The word "mcp" in an argument no longer looks like the mcp subcommand
Passing the word "mcp" as an argument no longer makes Claude Code think it should run as an MCP server.
found in this entry's text
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v2.1.239
MCP servers can be put in their own memory cgroup on Linux
On Linux you can force MCP servers into their own memory cgroup with an environment variable.
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v2.1.233
Artifact skills work with the 0.2.x viewer runtime
Interactive artifact elements now arm reliably on both the newer and older viewer runtimes.
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v2.1.228
Synced skills no longer have file attachments extracted, except when remote
Account-synced skills no longer have file attachments pulled out, except on remote or Cowork runs.
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v2.1.224
Telemetry forwarding now strips identifying fields and caps MCP event volume
Internal metrics forwarding strips identifying fields, buckets tool names and caps per-server MCP volume.
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v2.1.223
/mcp is dispatchable from thin clients
You can now run /mcp from thin clients where it was previously hidden.
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v2.1.221
Review-page publishes are validated for capabilities and approve stamps
PR review pages you publish are now strictly validated, with a clear refusal message when something is off.
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v2.1.219
Dev and engine build versions collapsed before telemetry
Internal build versions get trimmed before metrics are sent, so daily builds report one value.
found in this entry's text
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v2.1.209
Artifact Runtime Capabilities (MCP)
found in this entry's text
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v2.1.209
Capabilities Display in Tool Listings
found in this entry's text
- v2.1.196
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v2.1.186
MCP OAuth Login and Logout Commands
found in this entry's text
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v2.1.119
MCP Completion Support (
McpCompletable)found in this entry's text
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v1.0.31
Documentation Updates
found in this entry's text
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v0.2.81
VSCode Extension Renamed
found in this entry's text
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
0The miner has never read a build containing this name. It is here because a changelog entry of ours names it, which is evidence that it existed and not evidence of which releases carried it. The inventory starts at v2.1.138 and everything older than that was never mined.
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 CLI flag does. All CLI flags.