Hmbown/CodeWhale · error

Failed to update setting: invalid sandbox_mode '{value}'. Ex

Error message

Failed to update setting: invalid sandbox_mode '{value}'. Expected: read-only, workspace-write, danger-full-access, or external-sandbox.

What it means

Settings update validation for the sandbox-mode key: normalize_sandbox_mode returned None — the value matches none of the four accepted sandbox profiles. Same guard as the config-file loader, applied to the interactive settings setter.

Source

Thrown at crates/tui/src/settings.rs:1489

                    );
                };
                self.default_model = Some(model);
            }
            "reasoning_effort" | "effort" => {
                self.reasoning_effort = normalize_reasoning_effort_setting(value)?;
            }
            "permission_posture" | "permissions" => {
                self.permission_posture = normalize_permission_posture(value);
                if self.permission_posture.is_none() {
                    anyhow::bail!(
                        "Failed to update setting: invalid permission posture '{value}'. Expected: ask, auto-review, or full-access."
                    );
                }
            }
            "sandbox_mode" | "sandbox" | "filesystem_sandbox" => {
                self.sandbox_mode = normalize_sandbox_mode(value);
                if self.sandbox_mode.is_none() {
                    anyhow::bail!(
                        "Failed to update setting: invalid sandbox_mode '{value}'. Expected: read-only, workspace-write, danger-full-access, or external-sandbox."
                    );
                }
            }
            _ => {
                anyhow::bail!("Failed to update setting: unknown setting '{key}'.");
            }
        }
        Ok(())
    }

    /// Apply a named settings preset (#3478).
    ///
    /// Presets are the first bundled-settings mechanism: a single name applies a
    /// coherent group of presentation knobs. `calm` is the "beautiful/calm
    /// transcript" preset — it quiets motion and verbose tool output while
    /// **keeping evidence reachable**: thinking stays visible and tool runs stay
    /// expandable (only their inline detail is collapsed), so maintainer/release

View on GitHub (pinned to 0c42157ee5)

Solutions

1. Set sandbox mode to read-only, workspace-write, danger-full-access, or external-sandbox

When it happens

Trigger: Thrown at crates/tui/src/settings.rs:1489 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of Hmbown/CodeWhale@0c42157ee5 (2026-08-20). Data as JSON: /api/errors/07ff83a45e8007ec. Report an issue: GitHub.