Agent and Sandbox

AICodeReviewer drives an external agent CLI (Kilo Code by default) inside a sandbox. The agent namespace picks which CLI to run, sets the hard per-run timeout, enables context auto-compaction for long reviews, and selects the sandbox backend that isolates the agent from the host.

agent:
  default: kilo
  timeout_seconds: 300
  auto_approve: true
  context_compaction:
    auto: true
    prune: true
  sandbox:
    kind: docker
    engine: auto

agent.default — which agent CLI

Value	Behavior
kilo (default)	Kilo Code. The supported default path.
opencode	opencode adapter. Set only when validating that adapter.
zoo	Zoo Code adapter. Set only when validating that adapter.
copilot-cli	GitHub Copilot CLI adapter.
claude-code	Claude Code adapter.

Stick with the default

kilo is the validated default. Switch to another AgentKind only when you are explicitly validating that adapter.

agent.default can also be overridden at the workspaces.defaults.agent.default and workspaces.instances.<id>.agent.default layers.

agent.timeout_seconds — hard per-run cap

agent:
  timeout_seconds: 300   # production commonly uses 600 for large PRs

This is a hard cap on a single agent pass. When the timeout fires, the sandbox kills the whole process tree — the agent binary plus every worker subprocess it spawned, including workers that setsid into their own session. A run therefore cannot overrun by leaving orphaned workers behind.

Two things to keep in mind:

• The orchestrator may run several passes (initial review, context-repair, direct-LLM fallback), so the wall-clock time of a single review can be a few times this value. Set it comfortably above the slowest expected single pass.
• The “death-spiral” pitfall: if you set this too low for your typical diff size, every pass gets killed mid-work, the orchestrator retries, and you pay for partial work that never completes. Raise the value for large PRs rather than relying on retries.

agent.auto_approve

agent:
  auto_approve: true

When true (the default), AICodeReviewer auto-approves the agent’s proposed tool actions within the sandboxed review scope. Set to false only for debugging flows where you want to inspect each action.

agent.context_compaction — runtime-side history compaction

Long reviews (large diffs, many tool calls) can exceed the model’s context window before finishing. When enabled, AICodeReviewer injects each agent CLI’s native compaction settings so the agent summarizes its own conversation history before hitting the limit. This complements (does not replace) the top-level compression diff-summarization, which runs earlier in the pipeline.

Field	Type	Default	Description
auto	bool	true	Enable auto-compaction in supported agent runtimes.
threshold_percent	int (1–100)	–	Compact at this percent of the model context window (Kilo).
prune	bool	true	Prune old tool outputs between turns (Kilo / opencode).

agent:
  context_compaction:
    auto: true
    threshold_percent: 80   # Kilo: compact at 80% of the context window
    prune: true

Per-adapter injection

Each agent CLI receives compaction config in its own format:

Agent	Where it lands
Kilo	compaction.{auto,threshold_percent,prune} in kilo.json.
opencode	compaction.{auto,prune} in .opencode/config.json.
Zoo	autoCondenseContext / condenseContextPercentThreshold in .roo/settings.json.
Claude Code	Auto-compacts by default (delegated; no config injected).
Copilot CLI	Not applicable (no context-management surface).

Kilo needs a known context window

Kilo only auto-compacts when the model’s contextWindow is known, so threshold_percent has something to measure against. Either:

• enable llm.model_catalog so the window is resolved from models.dev, or
• set context_window (and ideally max_output_tokens) in llm.model_catalog.overrides for the model.

Without a known window, Kilo compaction silently stays inactive. See LLM Providers and Models for the catalog and override fields.

agent.sandbox — isolation backend

The sandbox isolates the agent from the host. It only mounts the scoped review directories, keeps the source tree read-only, and enforces an allowlist of commands/paths the agent may touch. If the agent needs more context, it should read mounted files with read-only commands or call aicr.fetch_more_context for a concrete path.

Field	Type	Default	Description
kind	enum	docker	Sandbox kind (see below).
engine	enum	auto	Container engine: auto, docker, or podman.
image	string	–	Optional explicit sandbox image.

kind values

Kind	Status	When to use
native	Available	Run the agent directly on the host (no container). Lowest isolation.
docker (default)	Available	Run inside a Docker container. Default for most deployments.
podman	Available	Run inside a Podman container. Preferred with deploy.sh + AICR_ENABLE_CONTAINER_SANDBOX and a mounted Podman socket.
docker_socket	Available	Docker-compatible mode for workflows that specifically expect the Docker CLI over a mounted socket.
k8s_pod	Reserved	Not yet implemented.
firecracker	Reserved	Not yet implemented.

engine values

auto (default) detects an available engine; docker and podman force a specific one. For deploy.sh with a mounted Podman socket, prefer kind: podman and engine: podman. Docker-compatible mode remains available when a workflow specifically expects the Docker CLI.

agent:
  sandbox:
    kind: podman
    engine: podman

sandbox is also overridable at the workspaces.defaults.sandbox and workspaces.instances.<id>.sandbox layers (note: per-instance sandbox is only available via workspaces.defaults, not directly on an instance — see the override table on the Configuration Overview page).