v1.6.0

Added

• Editors can pass HTTP MCP servers to a session. siGit Code now
  advertises mcpCapabilities.http, so an ACP client may list Streamable HTTP
  servers in mcpServers next to stdio ones. They are connected with the URL
  and headers the client sent and are scoped to that session, like the stdio
  ones. SSE is still not advertised, since the MCP spec deprecated it (#151).

• The plan panel survives a failed turn. The last write_todos list is
  now kept by siGit Code itself. When a turn ends in an endpoint error before
  the model gets to call write_todos again, the saved list is sent to the
  editor again, so the plan stays on screen where it used to go blank (#132).

Changed

• The ACP Rust SDK is now 2.2 (agent-client-protocol, up from 1.3).
  siGit Code still speaks ACP protocol v1 to the editor, so nothing changes on
  the wire. The unstable_auth_methods feature is gone because agent auth
  methods are stable in 2.x.

Fixed

• MCP servers the editor passes to a session are connected. ACP clients
  can name MCP servers in mcpServers when they open a session, and agents
  are required to connect to the stdio ones. siGit Code accepted the field and
  ignored it. The servers are now spawned when the session opens, their tools
  are offered to that session only, and /mcp lists them as coming from the
  editor. SIGIT_MCP=off still turns all of it off (#135).

• A relative cwd is rejected when a session starts. ACP requires the
  working directory and every additionalDirectories entry to be absolute.
  session/new, session/load and session/fork used to accept a relative
  one and resolve it against wherever the editor spawned the process. They now
  answer with an invalid-params error (#136).

• Loading a session that does not exist is an error. session/load with
  an id that was never saved used to succeed and open an empty session under
  that id, so the editor showed a blank thread that looked restored. It now
  answers "not found" (-32002). A thread opened in the running process but
  not spoken in yet still loads (#137).

• Compaction no longer dead-ends a long session. The summarization request
  used to carry the whole conversation, which by then was already over the
  model's window, so siGit Code Cloud timed out with a 504 and the session
  stopped with "start a new thread". The transcript sent for summarizing is
  now capped, cut from the middle so the opening request and the latest state
  are kept. If summarizing still fails, the oldest messages are dropped until
  the history fits, with whole tool rounds removed together. A failed attempt
  leaves the conversation as it was (#125).

• Gateway error pages stay out of the chat. When an endpoint answers with
  an HTML error page, the error shown is the status line, not the page's
  markup (#125).

• Issue and pull request work no longer assumes GitHub. The system prompt
  treated forge features as if every repository lived on GitHub, while the
  built-in mcp__sigit__* tools only work for repositories hosted on
  sigit.si. The agent now checks the remote first, uses those tools only for
  sigit.si repositories, and reaches for the forge's own CLI (gh, glab,
  tea) elsewhere (#127).

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Full changelog: https://github.com/getsigit/sigit/blob/v1.6.0/CHANGELOG.md

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About siGit Code: sigit.si/code