Files
msd-core/get-shit-done/references/context-budget.md
Tom Boucher 9d55d531a4 fix(#2432,#2424): pre-dispatch PLAN.md commit + reapply-patches baseline detection; docs(#2397): config schema drift (#2469)
- quick.md Step 5.6: commit PLAN.md to base branch before worktree executor
  spawn when USE_WORKTREES is active, preventing CC #36182 path-resolution
  drift that caused silent writes to main repo instead of worktree
- reapply-patches.md Option A: replace first-add commit heuristic with
  pristine_hashes SHA-256 matching from backup-meta.json so baseline detection
  works correctly on multi-cycle repos; first-add fallback kept for older
  installers without pristine_hashes
- CONFIGURATION.md: move security_enforcement/security_asvs_level/security_block_on
  to workflow.* (matches templates/config.json and workflow readers); rename
  context_profile → context (matches VALID_CONFIG_KEYS in config.cjs); add
  planning.sub_repos to schema example
- universal-anti-patterns.md + context-budget.md: fix context_window_tokens →
  context_window (the actual key name in config.cjs)

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-04-20 10:11:00 -04:00

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# Context Budget Rules
Standard rules for keeping orchestrator context lean. Reference this in workflows that spawn subagents or read significant content.
See also: `references/universal-anti-patterns.md` for the complete set of universal rules.
---
## Universal Rules
Every workflow that spawns agents or reads significant content must follow these rules:
1. **Never** read agent definition files (`agents/*.md`) -- `subagent_type` auto-loads them
2. **Never** inline large files into subagent prompts -- tell agents to read files from disk instead
3. **Read depth scales with context window** -- check `context_window` in `.planning/config.json`:
- At < 500000 tokens (default 200k): read only frontmatter, status fields, or summaries. Never read full SUMMARY.md, VERIFICATION.md, or RESEARCH.md bodies.
- At >= 500000 tokens (1M model): MAY read full subagent output bodies when the content is needed for inline presentation or decision-making. Still avoid unnecessary reads.
4. **Delegate** heavy work to subagents -- the orchestrator routes, it doesn't execute
5. **Proactive warning**: If you've already consumed significant context (large file reads, multiple subagent results), warn the user: "Context budget is getting heavy. Consider checkpointing progress."
## Read Depth by Context Window
| Context Window | Subagent Output Reading | SUMMARY.md | VERIFICATION.md | PLAN.md (other phases) |
|---------------|------------------------|------------|-----------------|------------------------|
| < 500k (200k model) | Frontmatter only | Frontmatter only | Frontmatter only | Current phase only |
| >= 500k (1M model) | Full body permitted | Full body permitted | Full body permitted | Current phase only |
**How to check:** Read `.planning/config.json` and inspect `context_window`. If the field is absent, treat as 200k (conservative default).
## Context Degradation Tiers
Monitor context usage and adjust behavior accordingly:
| Tier | Usage | Behavior |
|------|-------|----------|
| PEAK | 0-30% | Full operations. Read bodies, spawn multiple agents, inline results. |
| GOOD | 30-50% | Normal operations. Prefer frontmatter reads, delegate aggressively. |
| DEGRADING | 50-70% | Economize. Frontmatter-only reads, minimal inlining, warn user about budget. |
| POOR | 70%+ | Emergency mode. Checkpoint progress immediately. No new reads unless critical. |
## Context Degradation Warning Signs
Quality degrades gradually before panic thresholds fire. Watch for these early signals:
- **Silent partial completion** -- agent claims task is done but implementation is incomplete. Self-check catches file existence but not semantic completeness. Always verify agent output meets the plan's must_haves, not just that files exist.
- **Increasing vagueness** -- agent starts using phrases like "appropriate handling" or "standard patterns" instead of specific code. This indicates context pressure even before budget warnings fire.
- **Skipped steps** -- agent omits protocol steps it would normally follow. If an agent's success criteria has 8 items but it only reports 5, suspect context pressure.
When delegating to agents, the orchestrator cannot verify semantic correctness of agent output -- only structural completeness. This is a fundamental limitation. Mitigate with must_haves.truths and spot-check verification.