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What it does

Append a log entry to a file in the Undisk workspace. Designed for structured logging where multiple agents, sessions, or machines write to a shared log. Creates the file if it doesn’t exist. Each call appends the provided content as new lines at the end of the file — existing content is never overwritten. Automatically creates an immutable version on each append. Use read_file with line_start/line_end (e.g., line_start: -50) to efficiently tail recent entries without downloading the entire log.

Required scope

files:write

Parameters

ParameterTypeRequiredDescription
pathstringYesLog file path within the workspace (e.g., ‘logs/agent-activity.log’)
contentstringYesLog content to append. Each call appends this text as new lines at the end of the file.