The classic prompt_toolkit status bar already shows two background
indicators: ▶ N (/background agent threads) and ⚙ N (shell processes
spawned by terminal(background=true)). Background/async subagents
(delegate_task batches and background single delegations) had no
indicator despite being long-running work the user should be able to
see at a glance.
Add a third indicator ⛓ N sourced from
tools.async_delegation.active_count() — the count of delegations still
in the 'running' state. Renders in the plain-text builder and the
styled-fragment builder across the same width tiers as the other two
(omitted on the narrow <52 tier), guarded so a raising active_count()
leaves the snapshot at 0.
Teknium
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