Customize sessions in self-hosted environments changedself-hosted-environments-configuration
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349349A self-hosted session has no terminal attached, so an unanswered permission prompt stalls the turn until the user responds in the UI. Anthropic's control plane sends each session's tool list and permission rules with the work payload; the default configuration pre-approves routine tool calls, including `Bash`, and cloud sessions [pre-approve file edits regardless of mode](/docs/en/permission-modes#switch-permission-modes). A call that nothing pre-approves prompts through the session UI.
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351351<Note>
352 Only enable auto mode on an environment whose session containers run with [default-deny network egress](/docs/en/self-hosted-environments-deploy#default-deny-egress) and the rest of the [hardening section](/docs/en/self-hosted-environments-deploy#harden-your-deployment) in place. Routine tool calls, including `Bash` network requests, run without a human in the loop on both the default pre-approved tool set and in auto mode, so the network boundary is what limits where those calls can reach.
352 Only pin auto mode on an environment whose session containers run with [default-deny network egress](/docs/en/self-hosted-environments-deploy#default-deny-egress) and the rest of the [hardening section](/docs/en/self-hosted-environments-deploy#harden-your-deployment) in place. Routine tool calls, including `Bash` network requests, run without a human in the loop on both the default pre-approved tool set and in auto mode, so the network boundary is what limits where those calls can reach.
353353</Note>
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355355To keep prompts to a minimum regardless of what the control plane sends, pin [auto mode](/docs/en/permission-modes#eliminate-prompts-with-auto-mode) from your wrapper script or [`command` hook](#command). Auto mode lets sessions run without routine permission prompts: a separate classifier model reviews actions before they run and blocks the ones it rejects, and explicit ask rules still force a prompt; the permission modes page covers what the classifier checks. The runner appends server-computed flags before invoking the wrapper, and for single-value flags such as `--permission-mode` the parser honors the last occurrence, so a flag you append after `"$@"` overrides the server-sent value:
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