The whole hunk
from line 153, old and new numbered
/
lines
from line 153
153153
154154### Denying an entire tool
155155
156Adding a bare tool name like `Bash` or `WebFetch` as a [deny rule](/docs/en/permissions#manage-permissions) removes that tool from Claude's context entirely. Claude Code loads built-in tool definitions into the system prompt layer, so adding or removing one of these rules mid-session invalidates the cache. Claude Code applies the change on the next request, whether you add the rule through `/permissions` or by [editing a settings file directly](/docs/en/settings#when-edits-take-effect). That includes a rule you add through `/permissions` in the middle of a turn.
156If you add a bare tool name like `Bash` or `WebFetch` as a [deny rule](/docs/en/permissions#manage-permissions), Claude can't call that tool from your next request on, whether you add the rule through `/permissions` or by [editing a settings file directly](/docs/en/settings#when-edits-take-effect). That includes a rule you add through `/permissions` in the middle of a turn.
157157
158Only a deny rule that matches in the tool-name position has this effect: a bare tool name, the equivalent `Bash(*)` form, or a [tool-name glob](/docs/en/permissions#tool-name-wildcards) like `"*"`. A glob that matches only MCP tools, such as `"mcp__*"`, removes those tools the same way but leaves the cache intact when the matched tools are [deferred](#connecting-or-disconnecting-an-mcp-server), the default, since deferred definitions were never in the cached prefix. Scoped deny rules like `Bash(rm *)`, and all allow and ask rules, don't change which tools Claude sees. Claude Code checks them when Claude attempts a call, leaving the prefix intact.
158When [tool search](/docs/en/mcp#scale-with-mcp-tool-search) is active, which is the default on supported models, the request's tool definitions don't change and the cached prefix survives. When tool search is unavailable or disabled, Claude Code removes the definition from the next request, which invalidates the cache, and so does removing the rule later.
159
160Only a deny rule that matches in the tool-name position blocks a tool this way: a bare tool name, the equivalent `Bash(*)` form, or a [tool-name glob](/docs/en/permissions#tool-name-wildcards) like `"*"`. A glob that matches only MCP tools, such as `"mcp__*"`, blocks those tools the same way. Scoped deny rules like `Bash(rm *)`, and all allow and ask rules, don't change which tools Claude sees. Claude Code checks them when Claude attempts a call, leaving the prefix intact.
159161
160162### Compacting the conversation
161163