### Serena v1.2.0

April 27, 2026

Interactive Debugging. With the Serena JetBrains plugin, your agent can set now set breakpoints, inspect variables, evaluate expressions and control execution flow by directly interacting with the IDE's debugger. Our REPL-based interface is highly flexible, allowing all of this to be provided via a single tool.

Counteracting Claude Code Regressions. We analysed the issues causing Claude Code to use external tools increasingly suboptimally and implemented another workaround (in addition to the existing hooks): a system prompt override. Read our updated Claude code usage instructions for more information.

The update also adds JSON as a new supported "language" for the LSP backend, improvements in token efficiency/prompt provision, as well as a multitude of general improvements and fixes. See our change log for details.

Update Now. If you are using the uv tool installation of Serena, upgrade as follows:
uv tool upgrade serena-agent --prerelease=allow