Hiding configuration details in MCP error messages is now harder to overload

MCP servers are outside tools that Claude Code connects to. When one of them reports an error, Claude Code redacts the message, meaning it hides any text that came from your configuration (where secrets such as keys can live). That redaction now has an overall limit on how much decoding work it does and how many repeats it will handle. If an error message repeats too much of the configuration, Claude Code reports "MCP error text repeats too much of the config". The checking itself was also reworked to scan the text in a single pass.

Before this change, there was a simpler limit on decoding work.