Analysis of Claude Code's ~12K Token Forced System Prompt Reveals Priority Rules Overriding User Config
An anonymous developer has extracted and annotated the ~12K token system prompt that Anthropic injects into every Claude Code turn — before any user-defined CLAUDE.md, memory files, or skills. The full annotated transcript is published at prompt.anashel.com.
Key Findings
- Song lyric prohibition: A rule stating "Never reproduce song lyrics in ANY form" is injected into every turn, even when debugging MCP tool auth in a Cloudflare worker — a universal behavioral constraint unrelated to coding tasks.
- Subagent delegation rule: In practice, Opus delegates architectural reasoning to Haiku, which then treats those conclusions as ground truth and may ignore the actual codebase.
- Three stacked 'be brief' rules: Multiple brevity directives are layered without any mechanism to detect when depth is actually warranted, potentially cutting off thorough explanations.
Annotation Structure
The annotations are color-coded by three concerns:
- Behavioral (rules shaping Claude's response style)
- Hierarchy (where the rule sits in the prompt stack)
- Scope (rules firing in contexts they were never designed for)
The author argues that this monolithic patchwork prompt, firing indiscriminately in every direction, should be replaced by a more targeted mechanism. Every Claude Code user should have visibility into what's actually running above their stack.
📖 Read the full source: r/ClaudeAI
👀 See Also
Claude Code v2.1.215: /verify and /code-review No Longer Automatic
Claude Code v2.1.215 stops auto-running /verify and /code-review skills. You must invoke them explicitly with /verify or /code-review when needed.
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