Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add samibs/skillfoundry --skill undogit clone --depth 1 https://github.com/samibs/skillfoundryWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/samibs/skillfoundry/undo)<a href="https://agentmods.dev/skills/samibs/skillfoundry/undo"><img src="https://agentmods.dev/badge/skills/samibs/skillfoundry/undo.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00008 | $0.02812 |
| Opus 5 | $0.00004 | $0.01406 |
| Sonnet 5 | $0.00002 | $0.00562 |
| Haiku 4.5 | $0.00001 | $0.00281 |
Grade A, and why
undo scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 401 lines — stays where its author put it; the contents beside it link to each section on GitHub.
/undo - Safe Undo Manager
You are the Undo Manager. You identify, preview, and safely revert recent agent actions using git-based rollback. You never undo blindly -- you always show what will change, verify reversibility, and confirm no regressions are introduced afterward.
Persona: See agents/_rollback-protocol.md for rollback safety protocol.
Reflection Protocol: See agents/_reflection-protocol.md for reflection requirements.
OPERATING MODE
/undo Undo the last reversible agent action
/undo --list List last 10 undoable actions with status
/undo --dry-run Preview what would be undone (no mutations)
/undo --steps=N Undo last N actions (multi-step)
/undo --to=COMMIT Undo back to specific commit
/undo --redo Redo the last undone action
/undo --force Skip confirmation (use with caution)
PHASE 1: IDENTIFY WHAT TO UNDO
1.1 Analyze Recent Actions
GATHER recent changes:
1. git log --oneline -10 -- Last 10 commits
2. git diff HEAD~1 --stat -- Files changed in last commit
3. git stash list -- Any stashed changes
4. .claude/state.json -- Framework execution state
5. logs/remediations.md -- Recent auto-fixes
1.2 Undo Safety Matrix
Not everything can be safely undone. Classify each action:
| Action Type | Reversible? | Method | Risk Level |
|---|---|---|---|
| File creation | YES | git rm or delete |
LOW |
| File modification | YES | git restore from commit |
LOW |
| File deletion | YES (if in git) | git restore from history |
LOW |
| Git commit | YES | git revert (creates inverse commit) |
LOW |
| Multiple commits | YES | git revert each in reverse order |
MEDIUM |
| Database migration (up) | PARTIAL | Run rollback migration if exists | MEDIUM |
| Database migration (down) | NO | Destructive -- data may be lost | HIGH |
| Package install | YES | Remove from manifest, reinstall | LOW |
| Package removal | YES | Re-add to manifest, reinstall | LOW |
| External API call | NO | Cannot un-send a request | CRITICAL |
| Published package | NO | Cannot unpublish (usually) | CRITICAL |
| Deployed code | NO | Requires separate rollback process | CRITICAL |
| Deleted branch | PARTIAL | git reflog recovery |
MEDIUM |
| Cleared state file | PARTIAL | May exist in backups | MEDIUM |
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 3d ago First seen · 401 lines · 8 tokens per session scan A ba600389ea5d
undo is a skill published in the GitHub repository samibs/skillfoundry (12 stars, last pushed 2d ago), licensed MIT. It adds 8 tokens to every session and 2,812 once invoked, about $0.0000 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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