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6868`allowed_tools` and `disallowed_tools` (TypeScript: `allowedTools` / `disallowedTools`) add entries to the allow and deny rule lists in the evaluation flow above. If you name one of the [task-tracking tools](/docs/en/agent-sdk/todo-tracking#model-availability) in `allowed_tools`, Claude Code also opts the session in. Any other tool not listed in `allowed_tools` is still available to Claude and falls through to the permission mode. Deny rules behave differently depending on whether they name a tool or scope a pattern within one.
6969
70| Option | Effect |
71| :-------------------------------- | :--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
72| `allowed_tools=["Read", "Grep"]` | `Read` and `Grep` are auto-approved. Other tools not listed here still exist and fall through to the permission mode and `canUseTool`. |
73| `disallowed_tools=["Bash"]` | The `Bash` tool definition is removed from the request. Claude does not see the tool and cannot attempt it. |
74| `disallowed_tools=["Bash(rm *)"]` | `Bash` stays available. Calls matching `rm *` are denied in every permission mode, including `bypassPermissions`. Other `Bash` calls fall through to the permission mode. |
75| `disallowed_tools=["*"]` | Every tool definition is removed from the request. Tool-name globs are supported in deny rules: `"*"` matches every tool and `"mcp__*"` matches every MCP tool across all servers. |
70| Option | Effect |
71| :-------------------------------- | :--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
72| `allowed_tools=["Read", "Grep"]` | `Read` and `Grep` are auto-approved. Other tools not listed here still exist and fall through to the permission mode and `canUseTool`. |
73| `disallowed_tools=["Bash"]` | The `Bash` tool definition is removed from the request. Claude does not see the tool and cannot attempt it. |
74| `disallowed_tools=["Bash(rm *)"]` | `Bash` stays available. Calls matching `rm *` [as written](/docs/en/permissions#bash-rule-limits) are denied in every permission mode, including `bypassPermissions`. Other `Bash` calls, including `/bin/rm`, fall through to the permission mode. |
75| `disallowed_tools=["*"]` | Every tool definition is removed from the request. Tool-name globs are supported in deny rules: `"*"` matches every tool and `"mcp__*"` matches every MCP tool across all servers. |
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7777Allow rules accept tool-name globs only after a literal `mcp__<server>__` prefix. The server segment must be glob-free so the rule names a specific server you configured: `mcp__puppeteer__*` matches every tool from the `puppeteer` server, and `mcp__github__get_*` matches its `get_` tools. An unanchored entry like `allowed_tools=["*"]` or `allowed_tools=["mcp__*"]` is ignored with a startup warning and does not auto-approve anything.
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119119| `auto` | Model-classified approvals | A model classifier approves or denies permission prompts. See [Auto mode](/docs/en/permission-modes#eliminate-prompts-with-auto-mode) for availability |
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121121<Warning>
122 **Subagent inheritance:** Subagents inherit the parent session's permission mode. An [`AgentDefinition`'s `permissionMode`](/docs/en/agent-sdk/typescript#agentdefinition) can override it, except when the parent uses `bypassPermissions`, `acceptEdits`, or `auto`: those modes apply to every subagent and can't be overridden per subagent. Claude Code also ignores a definition's `permissionMode: "bypassPermissions"` when bypass mode is disabled by [`permissions.disableBypassPermissionsMode`](/docs/en/permissions#managed-settings), so that subagent runs with the parent session's mode.
122 **Subagent inheritance:** A subagent runs in the parent session's permission mode unless you set `permissionMode` on its [`AgentDefinition`](/docs/en/agent-sdk/typescript#agentdefinition) and the parent session is in `default`, `dontAsk`, or `plan` mode. Even then, Claude Code never applies a `"bypassPermissions"` value. A subagent runs in `bypassPermissions` mode only when the parent session itself does. The `bypassPermissions` exception requires Claude Code v2.1.267 or later.
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124124 Subagents may have different system prompts and less constrained behavior than your main agent, so inheriting `bypassPermissions` grants them full, autonomous system access. The [actions no mode auto-approves](/docs/en/permission-modes#actions-no-mode-auto-approves) still apply.
125125</Warning>