Apply when debugging. Trace each symptom back to the first place the system went wrong and fix it there. A guard is a fix only when the state it handles is legitimate.
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What the file says
# Fix Root Causes
When debugging, fix the fault, not the place where it surfaced. The symptom is where a wrong state became visible. The root cause is the first place the system did something it should not do, or failed to handle a state it should handle.
**Why:** A symptom fix hides the evidence and leaves the fault free to surface somewhere else. Each one makes the system harder to reason about, because the code now carries a workaround for a bug that nobody named.
**Pattern:**
- Reproduce first.
- Ask "why" at each step until the answer is a wrong decision in the code, not a consequence of an earlier one.
- When stuck, instrument. Read the actual error and the actual state. Do not guess.
- Ask whether the state that triggered the symptom is legitimate. If the system may be in that state, the code that broke on it is the root cause, and handling the state there is the fix. If the state should never exist, a check where it broke hides the bug. Find what produced the state. Guards, retries, swallowed errors, clamped values, and discarded state are the usual ways to hide a bug.
…
The line at the top of this page pins the label git:20261015.1dba27e, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
GET https://markdownregistry.com/api/v1/artifacts/art_g3764p5e4weybtqs
GET https://markdownregistry.com/api/v1/resolve?ref=michael-denyer/pstack-claude/principle-fix-root-causes
GET https://markdownregistry.com/api/v1/blob/d42f26857432f44880a2c08280fcfacb8ce08590413e6a2bcbd48aace84b58a9
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