ROOT CAUSE: Tier 2 used 'git stash' during the cruft_elimination_20260627
track execution and corrupted the user's in-progress files. The user
explicitly stated: 'if an agent fucks up, their tendency to want to revert
is not correct and instead they must live with the timeline and just do
corrections with a new commit. They can grab artifacts, code, etc, from
old commits but they cannot reset to that.'
This commit adds HARD BANs on git stash* and git clean -fd* at 3 layers
(per the existing 3-layer defense model documented in
conductor/tier2/agents/tier2-autonomous.md):
LAYER 1: AGENTS.md
- Added new HARD BAN: 'git stash* (any form: git stash, git stash pop,
git stash apply, git stash drop, git stash clear) is FORBIDDEN.
Stashing inverts the safety net of the working tree'
LAYER 2: conductor/tier2/opencode.json.fragment (Tier 2 autonomous)
- Added 'git stash*', 'git stash pop*', 'git stash apply*',
'git stash drop*', 'git stash clear*', 'git clean -fd*', 'git clean -fdx*'
to BOTH the top-level permission.bash deny list AND the
agent.tier2-autonomous.permission.bash deny list
- Also added 'git revert*' (was missing from fragment; already banned in prompt)
- These are now HARD DENIED at the OpenCode permission layer; the agent
cannot run them even if it tries
LAYER 3: conductor/tier2/agents/tier2-autonomous.md
- Added 'git stash* (any form)' to the Hard Bans list
- Added 'THE TIMELINE-IS-IMMUTABLE PRINCIPLE' section spelling out
exactly what to do when you fuck up:
- When you make a wrong commit, write a NEW commit that fixes it
- The git history is immutable on this branch
- You CAN grab artifacts from old commits via 'git show <sha>:<path> > <new-path>'
- You CANNOT reset the branch HEAD to an old commit
- 'git revert', 'git reset --hard', 'git reset --soft', 'git stash' are
all attempts to rewrite history and BANNED
- Correct pattern: pause, read the actual file, write a forward
corrective commit with a commit message that explains the fix
This addresses the root cause of the 2026-06-27 cruft_elimination
corruption. Future Tier 2 autonomous runs will be blocked from running
git stash* at 2 layers (OpenCode permission deny + Tier 2 prompt hard
ban list) and reminded at the agent-prompt layer (THE TIMELINE-IS-
IMMUTABLE PRINCIPLE section).
ed
6240b07b9e