Debugging via MCP 0.7.0

0.7.0 — Watch list, long values and concurrency (preview)

Added

• Watch list: watch_add, watch_list, watch_remove. The agent follows expressions across stops: every answer that reports
  a stop (debug_wait, the steps, debug_status...) carries their values and whether each changed since the previous stop. At most
  10 entries; values are masked and shortened like those of vars. The list belongs to the agent's connection, lives in memory and is
  dropped when the agent lets go or disconnects; your Watch windows and your solution are not touched. These are Read tools: with Read
  set to Ask, reading the values at a stop asks nothing more. Needs the extension and the debugviamcp server of the same
  release (protocol 2.9); an older extension answers that it must be updated.
• eval with offset and length reads a long value in pages (up to 16384 characters per page, up to 2,000,000 per value). The
  value is read once, masked as a whole before it is cut (a secret split by a page boundary stays hidden) and the next pages come
  from that saved read. Not allowed together with allowSideEffects.
• A concurrency lab for testing (samples/ConcurrencyLab: a data race, a deadlock and a crash on a worker thread) with end-to-end
  scenarios in tests/e2e/concurrency-lab.cs.

Fixed

• A stop with several threads no longer fails as a whole when a frame has no source line. threads and the call stack answered
  E_FAIL and an empty snapshot; such frames are now listed without a file and line.
• eval, vars and drill-down on a thread that is blocked (waiting on a lock) answer eval_failed with a pointer to stack
  instead of an unclear error.
• The failure text of a paged read is masked and cut like every other value.
• debug_wait after a stop no longer asks again for consent just to read the watch values when Read is Ask.

Changed

• Reading a long value page by page and keeping a watch's prepared expression are faster; a connection that never added a watch no
  longer switches to Visual Studio's UI thread when it is released.