Update to fstack

{
  "description": "Apply when context is filling up: large outputs, long files, repeated reads, fan-out planning. Route bulk to subagents; keep summaries in the main thread, not raw payloads.",
  "included_files": [],
  "name": "principle-guard-the-context-window",
  "skill_md_contents": "---\r\nname: principle-guard-the-context-window\r\ndescription: \"Apply when context is filling up: large outputs, long files, repeated reads, fan-out planning. Route bulk to subagents; keep summaries in the main thread, not raw payloads.\"\r\nuser-invocable: false\r\ndisable-model-invocation: true\r\n---\r\n\r\n# Guard the Context Window\r\n\r\nThe context window is finite and non-renewable within a session. Every token that enters should earn its place.\r\n\r\n**Why:** Context overflow degrades reasoning quality, creates compression artifacts, and halts progress. Unlike compute or time, context spent inside a session cannot be reclaimed.\r\n\r\n**Pattern:**\r\n- **Isolate large payloads.** Route verbose outputs, screenshots, and large documents to subagents. The main context gets summaries, not raw data.\r\n- **Don't read what you won't use.** Read selectively based on relevance. If a file isn't needed for the current task, skip it.\r\n- **Keep frequently used content inline.** Templates and references used on every invocation belong in the skill file, not in separate files that cost a read each time.\r\n- **Size phases and cap scope.** Limit files per phase, set turn budgets, account for mechanism costs.\r\n"
}