dsh-plugin-anti-rot

In long-running agent sessions, every failed tool call injects a raw stack dump into the context window — often dozens of noise lines. Over hours of work with repeated failures, this redundant text steadily erodes the model's available context budget, a phenomenon known as context rot, where the model begins to forget earlier instructions and output quality degrades. dsh-plugin-anti-rot was built to address exactly this problem.

The plugin hooks into the tools/post-execute waterfall and targets two specific failure signals: isError results (infrastructure failures such as spawn errors or aborts) and the trailing non-zero [exit code: N] marker defined by the shared rendering contract of shell tools. When a match is found, the error text is compressed to the first maxLines message lines, intermediate stack frames are dropped, and an elision marker names what was removed. The exit code marker is always preserved as the final line so that both the model and the terminal UI can still parse it correctly.

If your workflow involves extended agent runs with frequent shell invocations that occasionally fail, this plugin significantly reduces context consumption without losing the essential error information, freeing up valuable window space for the reasoning that actually matters.