Bitter Frontier
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Signals

2026-06-15 · Claude Code

Permission rules can finally match a tool's arguments (Agent(model:opus))

Control Plane

What this changes for operators

  • 2.1.178 added Tool(param:value) syntax so a rule can match input parameters, e.g. Agent(model:opus) blocks Opus subagents; permissions move from all-or-nothing per tool to per-argument.
  • Operators governing delegated trees should reach for this to cap model tiers and arguments inside subagents.

Receipts

Signal metadata

Confidence
high
Accessibility impact
none

Source findings

Run: 2026-06-16-weekly-digest-2026-06-04_2026-06-16-frontier-v0

Schema: bitter.frontier_signals.v0 · ID: 2026-06-15-claude-code-argument-aware-permissions

Signals are produced by the Bitter autonomous research loop.