AI for Obsidian: check the boundary between your vault and a model
Contents
AI for Obsidian
Vault access and model context
A local vault and an AI connection have different access boundaries. Follow the files and the outgoing text before deciding what is appropriate to share.
Local notes do not tell you where an AI request goes
You keep project notes in Obsidian because you want files you can inspect and organize yourself. Then you add an AI feature. The important new question is not whether the vault is still local. It is which files that feature can read, which passages it selects and where those passages are sent.
There is no single answer for every plugin. A plugin may use a local model, call a hosted provider, maintain an index or work only with selected text. Its actual implementation and settings determine the path. Do not infer that nothing leaves the device merely because the original notes live there.
Separate file access from model context
A process with access to a directory may be able to read its files. That does not mean every file is sent to a model on every request. Conversely, a search result that hides a note in the interface does not establish that the note was excluded from an earlier indexing or processing step.
Filtering can happen before a model receives text. It can also happen too late for the boundary you intend to protect. You need evidence for the particular plugin, not a universal claim that plugin filtering always works or always leaks.
For a manual alternative with no direct vault connection, use the three-note second-brain workflow. You choose the passages to paste; the receiving assistant still processes that text under its own account settings and terms.
A small scope example
Consider a fictional vault with three folders: Public research, Internal planning and Private drafts. You want an assistant to summarize public research only. Before using real notes, create harmless sample files and give each a distinctive sentence.
| Question | Evidence to inspect | What would remain unknown |
|---|---|---|
| Can the plugin read Private drafts? | Its file permissions, documented scope and relevant code or diagnostics. | A selection checkbox alone may not describe every background operation. |
| What gets indexed? | The configured index scope and whether sample sentences appear in stored records. | An index check does not by itself show the later model request. |
| What reaches the provider? | An authorized inspection of the actual outgoing request or equivalent trustworthy diagnostics. | One clean request is not proof about all future requests. |
| What happens after changing scope? | Repeat the sample check and inspect retained index entries. | Previously delivered text may remain elsewhere. |
Shared vaults can be useful when the sharing unit fits
Obsidian provides first-party collaboration through Sync shared vaults. Its documentation says fine-grained permissions are not supported: collaborators broadly share the vault’s permissions, while invitation management remains with the owner. It also distinguishes synchronization from live collaborative editing. Obsidian shared-vault documentation
That can fit a team whose members should all receive the same collection. A confidential note should not be placed in that shared collection merely because a plugin is configured not to display it. Separating vaults can be a legitimate boundary when file access and sharing are configured accordingly; separation is not inherently a leak.
Removing someone from synchronization is also different from making a copy already delivered to their device disappear. Describe the intended boundary accurately rather than promising retroactive control of every file.
Correct the cost assumption, then choose the smallest scope
Obsidian does not require a paid commercial license for work use. Its listed commercial license is optional support; Sync and Publish are separate paid services. Check the current Obsidian pricing page for the relevant service rather than treating a support license as a usage requirement.
For a private research habit, a local vault may remain the right home. For team knowledge, first decide who should receive the shared files, then decide what any AI connection may process. If different readers need different subsets, assess that requirement directly. The label “company brain” is not a substitute for an observed access boundary.
About this article
Written by the HeyBrain Editorial Team with AI assistance. The examples are fictional and illustrate design choices; they are not customer stories, product demonstrations or measured test results. Primary sources are linked beside the claims they support.
