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codex/codex-rs/app-server-protocol/schema/json/v2/ThreadStartParams.json
Michael Bolin 4816b89204 permissions: make profiles represent enforcement (#19231)
## Why

`PermissionProfile` is becoming the canonical permissions abstraction,
but the old shape only carried optional filesystem and network fields.
It could describe allowed access, but not who is responsible for
enforcing it. That made `DangerFullAccess` and `ExternalSandbox` lossy
when profiles were exported, cached, or round-tripped through app-server
APIs.

The important model change is that active permissions are now a disjoint
union over the enforcement mode. Conceptually:

```rust
pub enum PermissionProfile {
    Managed {
        file_system: FileSystemSandboxPolicy,
        network: NetworkSandboxPolicy,
    },
    Disabled,
    External {
        network: NetworkSandboxPolicy,
    },
}
```

This distinction matters because `Disabled` means Codex should apply no
outer sandbox at all, while `External` means filesystem isolation is
owned by an outside caller. Those are not equivalent to a broad managed
sandbox. For example, macOS cannot nest Seatbelt inside Seatbelt, so an
inner sandbox may require the outer Codex layer to use no sandbox rather
than a permissive one.

## How Existing Modeling Maps

Legacy `SandboxPolicy` remains a boundary projection, but it now maps
into the higher-fidelity profile model:

- `ReadOnly` and `WorkspaceWrite` map to `PermissionProfile::Managed`
with restricted filesystem entries plus the corresponding network
policy.
- `DangerFullAccess` maps to `PermissionProfile::Disabled`, preserving
the “no outer sandbox” intent instead of treating it as a lax managed
sandbox.
- `ExternalSandbox { network_access }` maps to
`PermissionProfile::External { network }`, preserving external
filesystem enforcement while still carrying the active network policy.
- Split runtime policies that legacy `SandboxPolicy` cannot faithfully
express, such as managed unrestricted filesystem plus restricted
network, stay `Managed` instead of being collapsed into
`ExternalSandbox`.
- Per-command/session/turn grants remain partial overlays via
`AdditionalPermissionProfile`; full `PermissionProfile` is reserved for
complete active runtime permissions.

## What Changed

- Change active `PermissionProfile` into a tagged union: `managed`,
`disabled`, and `external`.
- Keep partial permission grants separate with
`AdditionalPermissionProfile` for command/session/turn overlays.
- Represent managed filesystem permissions as either `restricted`
entries or `unrestricted`; `glob_scan_max_depth` is non-zero when
present.
- Preserve old rollout compatibility by accepting the pre-tagged `{
network, file_system }` profile shape during deserialization.
- Preserve fidelity for important edge cases: `DangerFullAccess`
round-trips as `disabled`, `ExternalSandbox` round-trips as `external`,
and managed unrestricted filesystem + restricted network stays managed
instead of being mistaken for external enforcement.
- Preserve configured deny-read entries and bounded glob scan depth when
full profiles are projected back into runtime policies, including
unrestricted replacements that now become `:root = write` plus deny
entries.
- Regenerate the experimental app-server v2 JSON/TypeScript schema and
update the `command/exec` README example for the tagged
`permissionProfile` shape.

## Compatibility

Legacy `SandboxPolicy` remains available at config/API boundaries as the
compatibility projection. Existing rollout lines with the old
`PermissionProfile` shape continue to load. The app-server
`permissionProfile` field is experimental, so its v2 wire shape is
intentionally updated to match the higher-fidelity model.

## Verification

- `just write-app-server-schema`
- `cargo check --tests`
- `cargo test -p codex-protocol permission_profile`
- `cargo test -p codex-protocol
preserving_deny_entries_keeps_unrestricted_policy_enforceable`
- `cargo test -p codex-app-server-protocol
permission_profile_file_system_permissions`
- `cargo test -p codex-app-server-protocol serialize_client_response`
- `cargo test -p codex-core
session_configured_reports_permission_profile_for_external_sandbox`
- `just fix`
- `just fix -p codex-protocol`
- `just fix -p codex-app-server-protocol`
- `just fix -p codex-core`
- `just fix -p codex-app-server`
2026-04-23 23:02:18 -07:00

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{
"$schema": "http://json-schema.org/draft-07/schema#",
"definitions": {
"AbsolutePathBuf": {
"description": "A path that is guaranteed to be absolute and normalized (though it is not guaranteed to be canonicalized or exist on the filesystem).\n\nIMPORTANT: When deserializing an `AbsolutePathBuf`, a base path must be set using [AbsolutePathBufGuard::new]. If no base path is set, the deserialization will fail unless the path being deserialized is already absolute.",
"type": "string"
},
"ApprovalsReviewer": {
"description": "Configures who approval requests are routed to for review. Examples include sandbox escapes, blocked network access, MCP approval prompts, and ARC escalations. Defaults to `user`. `auto_review` uses a carefully prompted subagent to gather relevant context and apply a risk-based decision framework before approving or denying the request. The legacy value `guardian_subagent` is accepted for compatibility.",
"enum": [
"user",
"auto_review",
"guardian_subagent"
],
"type": "string"
},
"AskForApproval": {
"oneOf": [
{
"enum": [
"untrusted",
"on-failure",
"on-request",
"never"
],
"type": "string"
},
{
"additionalProperties": false,
"properties": {
"granular": {
"properties": {
"mcp_elicitations": {
"type": "boolean"
},
"request_permissions": {
"default": false,
"type": "boolean"
},
"rules": {
"type": "boolean"
},
"sandbox_approval": {
"type": "boolean"
},
"skill_approval": {
"default": false,
"type": "boolean"
}
},
"required": [
"mcp_elicitations",
"rules",
"sandbox_approval"
],
"type": "object"
}
},
"required": [
"granular"
],
"title": "GranularAskForApproval",
"type": "object"
}
]
},
"DynamicToolSpec": {
"properties": {
"deferLoading": {
"type": "boolean"
},
"description": {
"type": "string"
},
"inputSchema": true,
"name": {
"type": "string"
},
"namespace": {
"type": [
"string",
"null"
]
}
},
"required": [
"description",
"inputSchema",
"name"
],
"type": "object"
},
"FileSystemAccessMode": {
"enum": [
"read",
"write",
"none"
],
"type": "string"
},
"FileSystemPath": {
"oneOf": [
{
"properties": {
"path": {
"$ref": "#/definitions/AbsolutePathBuf"
},
"type": {
"enum": [
"path"
],
"title": "PathFileSystemPathType",
"type": "string"
}
},
"required": [
"path",
"type"
],
"title": "PathFileSystemPath",
"type": "object"
},
{
"properties": {
"pattern": {
"type": "string"
},
"type": {
"enum": [
"glob_pattern"
],
"title": "GlobPatternFileSystemPathType",
"type": "string"
}
},
"required": [
"pattern",
"type"
],
"title": "GlobPatternFileSystemPath",
"type": "object"
},
{
"properties": {
"type": {
"enum": [
"special"
],
"title": "SpecialFileSystemPathType",
"type": "string"
},
"value": {
"$ref": "#/definitions/FileSystemSpecialPath"
}
},
"required": [
"type",
"value"
],
"title": "SpecialFileSystemPath",
"type": "object"
}
]
},
"FileSystemSandboxEntry": {
"properties": {
"access": {
"$ref": "#/definitions/FileSystemAccessMode"
},
"path": {
"$ref": "#/definitions/FileSystemPath"
}
},
"required": [
"access",
"path"
],
"type": "object"
},
"FileSystemSpecialPath": {
"oneOf": [
{
"properties": {
"kind": {
"enum": [
"root"
],
"type": "string"
}
},
"required": [
"kind"
],
"title": "RootFileSystemSpecialPath",
"type": "object"
},
{
"properties": {
"kind": {
"enum": [
"minimal"
],
"type": "string"
}
},
"required": [
"kind"
],
"title": "MinimalFileSystemSpecialPath",
"type": "object"
},
{
"properties": {
"kind": {
"enum": [
"current_working_directory"
],
"type": "string"
}
},
"required": [
"kind"
],
"title": "CurrentWorkingDirectoryFileSystemSpecialPath",
"type": "object"
},
{
"properties": {
"kind": {
"enum": [
"project_roots"
],
"type": "string"
},
"subpath": {
"type": [
"string",
"null"
]
}
},
"required": [
"kind"
],
"title": "KindFileSystemSpecialPath",
"type": "object"
},
{
"properties": {
"kind": {
"enum": [
"tmpdir"
],
"type": "string"
}
},
"required": [
"kind"
],
"title": "TmpdirFileSystemSpecialPath",
"type": "object"
},
{
"properties": {
"kind": {
"enum": [
"slash_tmp"
],
"type": "string"
}
},
"required": [
"kind"
],
"title": "SlashTmpFileSystemSpecialPath",
"type": "object"
},
{
"properties": {
"kind": {
"enum": [
"unknown"
],
"type": "string"
},
"path": {
"type": "string"
},
"subpath": {
"type": [
"string",
"null"
]
}
},
"required": [
"kind",
"path"
],
"type": "object"
}
]
},
"PermissionProfile": {
"oneOf": [
{
"description": "Codex owns sandbox construction for this profile.",
"properties": {
"fileSystem": {
"$ref": "#/definitions/PermissionProfileFileSystemPermissions"
},
"network": {
"$ref": "#/definitions/PermissionProfileNetworkPermissions"
},
"type": {
"enum": [
"managed"
],
"title": "ManagedPermissionProfileType",
"type": "string"
}
},
"required": [
"fileSystem",
"network",
"type"
],
"title": "ManagedPermissionProfile",
"type": "object"
},
{
"description": "Do not apply an outer sandbox.",
"properties": {
"type": {
"enum": [
"disabled"
],
"title": "DisabledPermissionProfileType",
"type": "string"
}
},
"required": [
"type"
],
"title": "DisabledPermissionProfile",
"type": "object"
},
{
"description": "Filesystem isolation is enforced by an external caller.",
"properties": {
"network": {
"$ref": "#/definitions/PermissionProfileNetworkPermissions"
},
"type": {
"enum": [
"external"
],
"title": "ExternalPermissionProfileType",
"type": "string"
}
},
"required": [
"network",
"type"
],
"title": "ExternalPermissionProfile",
"type": "object"
}
]
},
"PermissionProfileFileSystemPermissions": {
"oneOf": [
{
"properties": {
"entries": {
"items": {
"$ref": "#/definitions/FileSystemSandboxEntry"
},
"type": "array"
},
"globScanMaxDepth": {
"format": "uint",
"minimum": 1.0,
"type": [
"integer",
"null"
]
},
"type": {
"enum": [
"restricted"
],
"title": "RestrictedPermissionProfileFileSystemPermissionsType",
"type": "string"
}
},
"required": [
"entries",
"type"
],
"title": "RestrictedPermissionProfileFileSystemPermissions",
"type": "object"
},
{
"properties": {
"type": {
"enum": [
"unrestricted"
],
"title": "UnrestrictedPermissionProfileFileSystemPermissionsType",
"type": "string"
}
},
"required": [
"type"
],
"title": "UnrestrictedPermissionProfileFileSystemPermissions",
"type": "object"
}
]
},
"PermissionProfileNetworkPermissions": {
"properties": {
"enabled": {
"type": "boolean"
}
},
"required": [
"enabled"
],
"type": "object"
},
"Personality": {
"enum": [
"none",
"friendly",
"pragmatic"
],
"type": "string"
},
"SandboxMode": {
"enum": [
"read-only",
"workspace-write",
"danger-full-access"
],
"type": "string"
},
"ServiceTier": {
"enum": [
"fast",
"flex"
],
"type": "string"
},
"ThreadStartSource": {
"enum": [
"startup",
"clear"
],
"type": "string"
},
"TurnEnvironmentParams": {
"properties": {
"cwd": {
"$ref": "#/definitions/AbsolutePathBuf"
},
"environmentId": {
"type": "string"
}
},
"required": [
"cwd",
"environmentId"
],
"type": "object"
}
},
"properties": {
"approvalPolicy": {
"anyOf": [
{
"$ref": "#/definitions/AskForApproval"
},
{
"type": "null"
}
]
},
"approvalsReviewer": {
"anyOf": [
{
"$ref": "#/definitions/ApprovalsReviewer"
},
{
"type": "null"
}
],
"description": "Override where approval requests are routed for review on this thread and subsequent turns."
},
"baseInstructions": {
"type": [
"string",
"null"
]
},
"config": {
"additionalProperties": true,
"type": [
"object",
"null"
]
},
"cwd": {
"type": [
"string",
"null"
]
},
"developerInstructions": {
"type": [
"string",
"null"
]
},
"ephemeral": {
"type": [
"boolean",
"null"
]
},
"model": {
"type": [
"string",
"null"
]
},
"modelProvider": {
"type": [
"string",
"null"
]
},
"permissionProfile": {
"anyOf": [
{
"$ref": "#/definitions/PermissionProfile"
},
{
"type": "null"
}
],
"description": "Full permissions override for this thread. Cannot be combined with `sandbox`."
},
"personality": {
"anyOf": [
{
"$ref": "#/definitions/Personality"
},
{
"type": "null"
}
]
},
"sandbox": {
"anyOf": [
{
"$ref": "#/definitions/SandboxMode"
},
{
"type": "null"
}
]
},
"serviceName": {
"type": [
"string",
"null"
]
},
"serviceTier": {
"anyOf": [
{
"anyOf": [
{
"$ref": "#/definitions/ServiceTier"
},
{
"type": "null"
}
]
},
{
"type": "null"
}
]
},
"sessionStartSource": {
"anyOf": [
{
"$ref": "#/definitions/ThreadStartSource"
},
{
"type": "null"
}
]
}
},
"title": "ThreadStartParams",
"type": "object"
}