dsh-gpt-file-discipline: A Routing-Level Prompt Assembly Plugin for DeepSeek Harness

The DeepSeek Harness plugin addresses the cumbersome problem of dynamically adjusting system prompts when an agent switches across multi-model routes. It automatically switches prompts based on routing conditions: it adds a file-reading discipline for GPT models and appends a designated thinking language for DeepSeek routes. It supports exact matching, on-demand registration with no additional overhead, and allows customizing text and section names via configuration. Once installed, it automatically matches GPT models under the codex provider or models prefixed with deepseek, improving prompt management efficiency in mixed-model scenarios.