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When you configure an organization in Mesa, the mount field controls which of its repositories appear in your FUSE tree. There are two modes: all and explicit.

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All mode (default)

In all mode, every repository your API key can access is automatically mounted. New repos created in the org appear in the mount tree without any config changes. 
[organizations.acme-corp]
mount = "all"
This is the default — if you omit the mount field and have no repos.* sections, Mesa uses all mode. You can still add per-repo sections as overrides without changing the mode. For example, to pin a specific repo to a bookmark: 
[organizations.acme-corp]
mount = "all"

[organizations.acme-corp.repos.my-repo]
rev = { bookmark = "staging" }
All other repos in the org mount at their default bookmark; my-repo mounts at staging.
All mode is ideal for small-to-medium orgs where you want every repo available without maintaining a list.

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Listing repos in all mode

Running mesa repo list in all mode shows an empty list with a hint: 
org 'acme-corp' mounts all repos (0 mounted)
  (run `mesa repo list --all` to enumerate)
Use --all to fetch the full repo list from the API: 
mesa repo list --all

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Limitations

mesa repo open and mesa repo close are not available in all mode — there is no explicit list to add to or remove from. If you need to selectively mount repos, switch to explicit mode.

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Explicit mode

In explicit mode, only the repos listed in your config appear in the mount tree. 
[organizations.acme-corp]
mount = "explicit"

[organizations.acme-corp.repos.frontend]

[organizations.acme-corp.repos.backend]
rev = { bookmark = "dev" }
Here, only frontend and backend are mounted. All other repos in the org are invisible.

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Adding and removing repos

Use mesa repo open and mesa repo close to manage the mount list without editing the config file directly: 
# Add a repo to the mount
mesa repo open my-new-repo --org acme-corp

# Remove a repo from the mount
mesa repo close old-repo --org acme-corp
These commands update config.toml and notify the running daemon.

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Listing repos in explicit mode

# Show only mounted repos
mesa repo list

# Show all repos in the org with mount status
mesa repo list --all
With --all, mounted repos are marked with ● and available (unmounted) repos with ○.

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Switching modes

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From all to explicit

Edit your config.toml to set mount = "explicit" and add sections for the repos you want: 
[organizations.acme-corp]
mount = "explicit"

[organizations.acme-corp.repos.my-repo]
Restart the daemon (Ctrl+C and mesa mount again, or mesa mount --daemonize) for the change to take effect.

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From explicit to all

Remove the mount field (or set it to "all") and optionally remove the repos.* sections: 
[organizations.acme-corp]
mount = "all"
If you remove both the mount field and all repos.* sections, Mesa implicitly defaults to all mode. If you want to keep repo sections as overrides in all mode, set mount = "all" explicitly to avoid ambiguity.

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Implicit resolution

When the mount field is absent, Mesa infers the mode from whether repos.* sections exist:
mount fieldrepos.* sectionsResolved mode
absentnoneall
absentpresentexplicit
"all"anyall
"explicit"anyexplicit

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During onboarding

When you run mesa mount for the first time, the interactive wizard asks how you want to mount repos:
  • All repos — sets mount = "all" (every repo in the org is mounted)
  • Select specific repos — lets you pick repos from a list and sets mount = "explicit"
If the org has no repos yet, the wizard defaults to all mode so that repos created later are automatically mounted.