Bug

When compaction.mode: "safeguard" is enabled with a custom compaction.model (e.g., anthropic/claude-sonnet-4-6), the safeguard extension ignores it and uses the session's main model instead.

Root Cause

In the safeguard extension's session_before_compact handler, the model is resolved as:

const model = ctx.model ?? runtime?.model;

This prefers ctx.model (the session's main model, e.g., Opus) over runtime?.model (the configured compaction model from agents.defaults.compaction.model). Since ctx.model is always set for active sessions, the configured compaction model is never used.

Expected Behavior

The configured compaction.model should take precedence over the session model:

const model = runtime?.model ?? ctx.model;

Impact

• Users configuring a cheaper/faster model for compaction (e.g., Sonnet instead of Opus) see no effect
• Compaction runs on the expensive session model, increasing costs
• The compaction.model config option is effectively broken in safeguard mode

Environment

• OpenClaw 2026.3.28
• compaction.mode: "safeguard"
• compaction.model: "anthropic/claude-sonnet-4-6"

Workaround

Patch the dist file directly: swap ctx.model ?? runtime?.model to runtime?.model ?? ctx.model in the safeguard extension.