Changes for version 0.104 - 2026-08-09
- Fix "Use of uninitialized value in join or string" warning from MCP::Run::Compress::compress/process when a transform coderef returns undef (e.g. git diff --stat's summary-line drop). undef values are now filtered out before join, so dropping a line via `return undef` no longer warns.
- Normalize undef $stdout/$stderr inputs to empty strings at the top of compress()/process() so a caller passing undef for an empty stream no longer trips warnings through the filter pipeline.
- Fix filter resolution: when both a parsed_command filter and a legacy regex filter match the same command, the parsed_command filter now wins (it is strictly more specific). Previously hash iteration order decided, which meant `git diff --stat` could land on the bare `^git\s+diff\b` filter and skip the "N+M- filename" transform rewrite entirely.
- Add t/30-no-warnings.t and t/40-compress-bin.t covering the regression and the previously untested bin/mcp-run-compress modes (--hook, --b64, --filter-files, --install-claude).
- Fix t/20-integration.t: pass MCP::Server::Context instances to $server->handle() instead of raw hashes. MCP::Server's _handle_tools_list calls $context->has_scope, which crashes on an unblessed reference. The test was the bug, not the server.
Documentation
MCP server that executes shell commands via bash over stdio
Wrap a shell command through MCP::Run::Compress for LLM-friendly output
Modules
MCP server with a command execution tool
MCP server that executes commands via bash
Output compression for LLMs
Command Output Compression Reference