Agent Instance 0.21.2

Agent Instance 0.21.2

Attention admission failures can now carry a negotiated, request-bound not_forwarded outcome. Experiences can distinguish a refused optional input from uncertain execution without interpreting an error code or message. This does not settle previous effects, complete a task or authorize retrying an offer. Backend errors cannot impersonate this host-owned marker. See the attention contract.

Session history loads no longer write diagnostic state for every history notification. Replay activity is sampled once per second, with a terminal count and duration. All history notifications, authorization checks, saved sessions and ordinary prompt observations remain intact. A disposable 2,048-frame fixture improved from 13.51 seconds to 0.22 seconds; actual installation performance depends on its history, backend and storage.

Existing installation settings, selected engines, credentials and work authority are preserved. Upgrades use the enrolled connection lifecycle; this release does not enable new task permissions or configure trusted MCP endpoints automatically.

Published binaries are the exact platform CI artifacts from tested commit 3d59c95673717d6567e010c647a87436ad35d4ac. The merged tag commit abc4e6bab3df3441eee9f04093854cffdc3d9523 has the identical source tree 41425a44bc1129ad1f33a646a003e4da764a2579.