Version 0.24.0

Features

DUT context for AI agents — the MCP server now understands the board, not just the bench. New DUTContext, SubSystem, and DocRef models capture a device-under-test’s purpose, summary, MCU, key peripherals, and schematic/datasheet references (by URL or synced repo_path). New discover_dut() and cite_schematic() tools and lager://dut/overview.md resources surface it, and discover_bench(net) now returns the parent subsystem and relevant doc refs. Schematics are referenced, never stored — the agent fetches and analyzes them with its own tools.
lager box dut show | edit | add-doc — author and inspect DUT context (subsystems, documentation references) stored in the Lager Box’s bench.json.
DebugNet.session() and DebugNet.rtt_defmt(elf=...). session() is a context manager that scopes connect-on-entry and guaranteed teardown so the safe connect/disconnect ordering is encoded once. rtt_defmt() opens an RTT session and pipes it through defmt-print, yielding decoded log lines instead of raw bytes — so on-box lager python tests can assert directly on defmt-encoded firmware logs. defmt-print is now bundled in the Lager Box image.
MCP slash-command prompts (write_lager_test, explore_bench, assess_test_feasibility) and a new “AI Agents (MCP)” documentation tab with a server overview and DUT-context guide.

The MCP server is now a read-only discovery & planning surface. Its purpose is to let an agent learn the bench and DUT well enough to write and run a test; execution happens in the test script via lager python … --box <box-ip>. discover_bench/discover_dut echo the real address the client connected on and return a ready-to-run command, and discover_bench now reports instrument channels, capabilities, firmware, and authored specs/ranges.
Reconnect-aware RTT and self-healing reset/read_memory on both J-Link and OpenOCD backends. The RTT reader transparently re-attaches to the same port after a socket drop (it only re-attaches to an already-running server, never starts one), and reset/erase/read_memory reconnect automatically when no server is running — so scripted flash → attach → reset loops no longer thrash. A DA1469x guard avoids auto-starting an unhalted server.
Simplified agent-facing net metadata to purpose / notes / tags, replacing the overlapping description / dut_connection / test_hints fields. lager nets describe now takes --purpose / --notes / --tag, and the Net Manager TUI edit dialog matches.
The MCP server auto-reloads bench config on change (it watches the mtimes of bench.json, saved_nets.json, and box_id), so DUT/net edits are picked up on an agent’s next request without a reload call or service restart. It also warns when a subsystem references a net that doesn’t exist.

Debug connect no longer burns its retries when the GDB remote rejects non-stop mode. JLinkGDBServer rejects set non-stop on, which previously exhausted all connect retries and skipped target verification and RTT control-block auto-detection. The connect now detects that specific rejection and retries once with an all-stop controller; OpenOCD keeps non-stop, and any other target error still fails loudly.
lager box dut add-doc / edit now save bench.json without requiring passwordless sudo, and no longer raise a KeyError on a Lager Box whose bench.json has no DUT block.
lager box dut edit and lager box config edit now honor $EDITOR/$VISUAL flags (e.g. subl -w, code -w, vim -p) by parsing the editor string with shlex.split() instead of treating it as a single program name.

The MCP server no longer exposes hardware I/O or mutation tools. The quick_io, install_dependency, run_python, pip, logs, defaults, and binaries tools, the safety/preflight engine, the run_lager CLI passthrough, and the audit subsystem have been removed. Agents now execute tests via lager python path/to/test.py --box <box-ip> rather than over MCP. Per-bench safety constraints are now advisory metadata surfaced in discover_bench, not enforced.

To install this version:

pip install lager-cli==0.24.0

To upgrade from a previous version:

pip install --upgrade lager-cli