tool.call
A Claude Code settings key, read out of the shipped bundle. No mined inventory carries it: everything below comes from what this site has written about it.
Tools a plugin registers reach the model through a local loopback MCP server.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.242.
In the changelogs
19Releases whose published page names tool.call.
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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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v2.1.299
Plugin hook denials now carry a reason
Default deny responses for plugin hooks such as tool.check and agent.spawn now include a reason alongside the decision
found in this entry's text
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v2.1.287
Remote shell commands now pass on live progress and an output preview
Shell commands run for a remote session now pass on live progress and keep the end of their output as a preview
found in this entry's text
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v2.1.287
Remote sessions keep live shell output when no hooks are set
In remotely served sessions, Claude Code now keeps the latest live output of shell commands unless hooks are set up
found in this entry's text
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v2.1.284
Error for an unanswered plugin MCP tool call now shows the correct tool name pattern
When no
tool.callhook answers a plugin-served MCP tool, the hint now builds the tool name from the MCP server's name, not the plugin'sfound in this entry's text
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v2.1.283
Hook modules that don't match a tool call are skipped earlier
Claude Code now checks hook modules against key fields of a tool call itself and skips those that don't match, instead of sending every call to every module
found in this entry's text
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v2.1.281
Hook/tool.call payload strips isReadOnly
tool.call events now have their isReadOnly field removed before they are passed on
found in this entry's text
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v2.1.275
tool.call hook-event schema gains a
measurecombinatorThe tool.call hook event gained a 'measure' step that combines context across related events
named in this entry, found in this entry's text
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v2.1.269
New
tool.checkhook event wired into the tool-approval pipelineNew tool.check hook can override a hook's earlier 'deny' decision on a tool call
found in this entry's text
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v2.1.269
New telemetry/event identifiers added
Several new internal event and telemetry names have been registered
found in this entry's text
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v2.1.267
Policy checks for agent.spawn and tool.call gain argument restoration
Policy checks for spawning agents and calling tools now restore pinned fields a hook altered, not just flag them
found in this entry's text
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v2.1.265
Plugin telemetry site map gains command.run and command.describe hooks
Plugin hook telemetry adds command.run and command.describe event types
found in this entry's text
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v2.1.260
New plugin-authoring skill for function-hooks plugins
A new bundled skill teaches how to write function-hook plugins.
found in this entry's text
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v2.1.257
get_context_usage tool call gains a detail parameter
get_context_usage takes a detail parameter, where summary answers without extra token-counting API calls.
found in this entry's text
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v2.1.248
Bad hook matchers are reported against the event they belong to
Bad hook matchers now produce an error naming the event they belong to.
found in this entry's text
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v2.1.242
Plugin-registered tools are served over a local MCP server
Tools a plugin registers reach the model through a local loopback MCP server.
found in this entry's text
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v2.1.242
Each hook event enforces what a plugin is allowed to change
Plugin hooks are limited in what they may rewrite, and cannot take over question prompts.
found in this entry's text
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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
First cited
2The earliest release whose published evidence quoted tool.call was v2.1.281, 23 Sep 2026. That is the oldest release this project wrote about it, so it is a floor on the name's age and not the release that introduced it. It is not a presence reading: which builds carried the name is the table below.
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 settings key does. All settings keys.