Tools reference changedtools-reference
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99To add custom tools, connect an [MCP server](/docs/en/mcp). To extend Claude with reusable prompt-based workflows, write a [skill](/docs/en/skills), which runs through the existing `Skill` tool rather than adding a new tool entry.
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12 On Pro, Max, and Team plans, Claude Code starts sessions in [auto mode](/docs/en/permission-modes#eliminate-prompts-with-auto-mode), where a classifier decides most of these prompts instead of you. The `Permission required` column shows whether the tool prompts in [Manual mode](/docs/en/permission-modes) for paths inside the working directory. File-access tools marked No, including `Read`, `Grep`, and `Glob`, still prompt for paths outside the [working directory and additional directories](/docs/en/permissions#working-directories). `Bash` is marked Yes but runs a built-in set of [read-only commands](/docs/en/permissions#read-only-commands) without prompting.
12 In [auto mode](/docs/en/permission-modes#eliminate-prompts-with-auto-mode), a classifier decides most permission prompts instead of you. The `Permission required` column shows whether the tool prompts in [Manual mode](/docs/en/permission-modes) for paths inside the working directory. File-access tools marked No, including `Read`, `Grep`, and `Glob`, still prompt for paths outside the [working directory and additional directories](/docs/en/permissions#working-directories). `Bash` is marked Yes but runs a built-in set of [read-only commands](/docs/en/permissions#read-only-commands) without prompting.
1313</Info>
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1515| Tool | Description | Permission required |
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