# Second Brain Changed My Mind

> >-

- **Type:** Skill
- **Install:** `agentstack add skill-undefined-ui-second-brain-os-second-brain-changed-my-mind`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [undefined-ui](https://agentstack.voostack.com/s/undefined-ui)
- **Installs:** 0
- **Category:** [AI & ML](https://agentstack.voostack.com/c/ai-and-ml)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [undefined-ui](https://github.com/undefined-ui)
- **Source:** https://github.com/undefined-ui/second-brain-os/tree/main/skills/second-brain-changed-my-mind
- **Website:** https://x.com/undefinedKi/status/2068306794116501544

## Install

```sh
agentstack add skill-undefined-ui-second-brain-os-second-brain-changed-my-mind
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# Trace changed positions

This is the query a vault can answer that nothing else can, and the reason the
supersession rules exist. It only works because contradictions are recorded
rather than overwritten.

## Core rule

Report the change with both positions, both dates and the evidence between them.
A conclusion without its history is just the current claim.

## Workflow

1. **Find superseded claims** across concept pages, and contradictions where the
   sources differ in date.
2. **Reconstruct the sequence:** what the page said, when, based on what; what
   changed it, when.
3. **Distinguish real revision from correction.** A factual error being fixed is
   not a change of mind. A conclusion being revised on better evidence is.
4. **Flag unresolved ones.** Contradictions still sitting open are the most
   actionable output here.
5. **Say how firm the current position is,** based on what moved it.

## Output format

```
## 
Was:  (, )
Now:  (, )
What moved it: 
Firmness: 

## Still unresolved

```

## Calibration

If nothing has changed in the period, say so in one line. Manufacturing an
apparent revision from two pages that never disagreed is worse than an empty
result.

Never present the more recent source as correct by virtue of being recent.

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [undefined-ui](https://github.com/undefined-ui)
- **Source:** [undefined-ui/second-brain-os](https://github.com/undefined-ui/second-brain-os)
- **License:** MIT
- **Homepage:** https://x.com/undefinedKi/status/2068306794116501544

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-undefined-ui-second-brain-os-second-brain-changed-my-mind
- Seller: https://agentstack.voostack.com/s/undefined-ui
- Browse the marketplace: https://agentstack.voostack.com/browse

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Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.