diff --git a/crates/relicario-cli/src/main.rs b/crates/relicario-cli/src/main.rs
index 9ffd212..4d2eb7a 100644
--- a/crates/relicario-cli/src/main.rs
+++ b/crates/relicario-cli/src/main.rs
@@ -9,6 +9,7 @@ mod helpers;
 mod parse;
 mod prompt;
 mod session;
+mod org_session;
 
 use std::path::PathBuf;
 
diff --git a/crates/relicario-cli/src/org_session.rs b/crates/relicario-cli/src/org_session.rs
new file mode 100644
index 0000000..6b3357d
--- /dev/null
+++ b/crates/relicario-cli/src/org_session.rs
@@ -0,0 +1,320 @@
+//! Unlocked org vault session: holds the org master key for the duration of a
+//! CLI invocation.
+
+use std::fs;
+use std::path::{Path, PathBuf};
+
+use anyhow::{bail, Context, Result};
+use zeroize::Zeroizing;
+
+use relicario_core::{
+    decrypt_item, decrypt_org_manifest, encrypt_item, encrypt_org_manifest,
+    Item, ItemId, MemberId, OrgCollections, OrgManifest, OrgMember, OrgMembers, OrgMeta,
+};
+
+pub struct UnlockedOrgVault {
+    pub root: PathBuf,
+    pub org_key: Zeroizing<[u8; 32]>,
+}
+
+impl UnlockedOrgVault {
+    pub fn root(&self) -> &Path { &self.root }
+    pub fn key(&self) -> &Zeroizing<[u8; 32]> { &self.org_key }
+
+    pub fn manifest_path(&self) -> PathBuf { self.root.join("manifest.enc") }
+
+    /// Collection-scoped item path: `items/<collection-slug>/<id>.enc`.
+    /// The leading slug segment is what the pre-receive hook authorizes against
+    /// members.json — it never decrypts the blob. The slug must be non-empty and
+    /// already validated.
+    pub fn item_path(&self, collection_slug: &str, id: &ItemId) -> PathBuf {
+        self.root
+            .join("items")
+            .join(collection_slug)
+            .join(format!("{}.enc", id.as_str()))
+    }
+
+    pub fn member_key_path(&self, id: &MemberId) -> PathBuf {
+        self.root.join("keys").join(format!("{}.enc", id.as_str()))
+    }
+    pub fn members_path(&self) -> PathBuf { self.root.join("members.json") }
+    pub fn collections_path(&self) -> PathBuf { self.root.join("collections.json") }
+    pub fn org_meta_path(&self) -> PathBuf { self.root.join("org.json") }
+
+    pub fn load_meta(&self) -> Result<OrgMeta> {
+        let s = fs::read_to_string(self.org_meta_path()).context("read org.json")?;
+        Ok(serde_json::from_str(&s).context("parse org.json")?)
+    }
+
+    pub fn load_members(&self) -> Result<OrgMembers> {
+        let s = fs::read_to_string(self.members_path()).context("read members.json")?;
+        Ok(serde_json::from_str(&s).context("parse members.json")?)
+    }
+
+    pub fn save_members(&self, members: &OrgMembers) -> Result<()> {
+        let json = serde_json::to_string_pretty(members)?;
+        atomic_write(&self.members_path(), json.as_bytes())
+    }
+
+    pub fn load_collections(&self) -> Result<OrgCollections> {
+        let s = fs::read_to_string(self.collections_path()).context("read collections.json")?;
+        Ok(serde_json::from_str(&s).context("parse collections.json")?)
+    }
+
+    pub fn save_collections(&self, collections: &OrgCollections) -> Result<()> {
+        let json = serde_json::to_string_pretty(collections)?;
+        atomic_write(&self.collections_path(), json.as_bytes())
+    }
+
+    pub fn load_manifest(&self) -> Result<OrgManifest> {
+        let bytes = fs::read(self.manifest_path()).context("read manifest.enc")?;
+        Ok(decrypt_org_manifest(&bytes, &self.org_key)?)
+    }
+
+    pub fn save_manifest(&self, manifest: &OrgManifest) -> Result<()> {
+        let bytes = encrypt_org_manifest(manifest, &self.org_key)?;
+        atomic_write(&self.manifest_path(), &bytes)
+    }
+
+    /// Encrypt + write an item under its collection directory, creating the
+    /// directory if needed. Returns the repo-relative path for git staging.
+    pub fn save_item(&self, collection_slug: &str, item: &Item) -> Result<String> {
+        let path = self.item_path(collection_slug, &item.id);
+        if let Some(parent) = path.parent() {
+            fs::create_dir_all(parent)
+                .with_context(|| format!("create {}", parent.display()))?;
+        }
+        let bytes = encrypt_item(item, &self.org_key)?;
+        atomic_write(&path, &bytes)?;
+        Ok(format!("items/{}/{}.enc", collection_slug, item.id.as_str()))
+    }
+
+    /// Read + decrypt an item from its collection directory.
+    pub fn load_item(&self, collection_slug: &str, id: &ItemId) -> Result<Item> {
+        let path = self.item_path(collection_slug, id);
+        let bytes = fs::read(&path)
+            .with_context(|| format!("read item {}", path.display()))?;
+        Ok(decrypt_item(&bytes, &self.org_key)?)
+    }
+
+    /// Delete an item blob. Missing file is not an error (partial-write
+    /// recovery, same as the personal-vault purge path).
+    pub fn remove_item(&self, collection_slug: &str, id: &ItemId) -> Result<()> {
+        let path = self.item_path(collection_slug, id);
+        match fs::remove_file(&path) {
+            Ok(()) => Ok(()),
+            Err(e) if e.kind() == std::io::ErrorKind::NotFound => Ok(()),
+            Err(e) => Err(anyhow::Error::from(e)
+                .context(format!("delete {}", path.display()))),
+        }
+    }
+
+    /// Bail unless `member` has `slug` in their collection grants. The slug
+    /// existence check is done separately by the caller against collections.json.
+    pub fn ensure_grant(member: &OrgMember, slug: &str) -> Result<()> {
+        if member.collections.iter().any(|c| c == slug) {
+            Ok(())
+        } else {
+            bail!(
+                "access denied: you do not have a grant for collection `{slug}` — ask an admin to run `relicario org grant`"
+            )
+        }
+    }
+
+    /// Load members.json and find the caller's member entry by matching the
+    /// current device's ed25519 fingerprint against each member's pubkey
+    /// fingerprint. Fingerprint comparison (not raw OpenSSH-string equality)
+    /// tolerates comment/whitespace differences in the serialized key.
+    pub fn current_member(&self) -> Result<relicario_core::OrgMember> {
+        let device_fp = current_device_fingerprint()?;
+        let members = self.load_members()?;
+        members
+            .members
+            .into_iter()
+            .find(|m| {
+                relicario_core::fingerprint(&m.ed25519_pubkey)
+                    .ok()
+                    .as_deref()
+                    == Some(device_fp.as_str())
+            })
+            .ok_or_else(|| {
+                anyhow::anyhow!(
+                    "your device key is not registered in this org — ask an admin to run `org add-member`"
+                )
+            })
+    }
+}
+
+/// Locate the org vault root from RELICARIO_ORG_DIR env var or --dir flag value.
+pub fn org_dir(dir_flag: Option<&std::path::Path>) -> Result<PathBuf> {
+    if let Some(d) = dir_flag {
+        return Ok(d.to_path_buf());
+    }
+    if let Ok(v) = std::env::var("RELICARIO_ORG_DIR") {
+        return Ok(PathBuf::from(v));
+    }
+    bail!("org vault location required: set RELICARIO_ORG_DIR or pass --dir <path>")
+}
+
+/// Open an org vault: locate the root, read members.json to find the caller's
+/// member entry (by ed25519 fingerprint), then unwrap their keys/<id>.enc to
+/// recover the org master key.
+pub fn open_org_vault(dir_flag: Option<&std::path::Path>) -> Result<UnlockedOrgVault> {
+    let root = org_dir(dir_flag)?;
+
+    let device_fp = current_device_fingerprint()?;
+    let members_json = fs::read_to_string(root.join("members.json"))
+        .context("read members.json — is this an org vault?")?;
+    let members: OrgMembers = serde_json::from_str(&members_json).context("parse members.json")?;
+    let member = members
+        .members
+        .iter()
+        .find(|m| {
+            relicario_core::fingerprint(&m.ed25519_pubkey)
+                .ok()
+                .as_deref()
+                == Some(device_fp.as_str())
+        })
+        .ok_or_else(|| anyhow::anyhow!("your device key is not in this org"))?;
+
+    // Load this member's wrapped key blob.
+    let key_path = root
+        .join("keys")
+        .join(format!("{}.enc", member.member_id.as_str()));
+    let wrapped =
+        fs::read(&key_path).with_context(|| format!("read {}", key_path.display()))?;
+
+    // Recover the device ed25519 seed and unwrap.
+    let seed = current_device_seed()?;
+    let org_key = relicario_core::unwrap_org_key(&wrapped, &seed)?;
+
+    Ok(UnlockedOrgVault { root, org_key })
+}
+
+/// OpenSSH SHA-256 fingerprint of the active device's signing key.
+fn current_device_fingerprint() -> Result<String> {
+    let name = crate::device::current_device()?
+        .ok_or_else(|| anyhow::anyhow!("no active device — run `relicario device add` first"))?;
+    let pub_path = crate::device::device_dir(&name)?.join("signing.pub");
+    let pubkey = fs::read_to_string(&pub_path)
+        .with_context(|| format!("read {}", pub_path.display()))?;
+    Ok(relicario_core::fingerprint(pubkey.trim())?)
+}
+
+/// Recover the active device's ed25519 seed (the 32-byte private scalar source)
+/// from its OpenSSH `signing.key`, for ECIES unwrap.
+fn current_device_seed() -> Result<Zeroizing<[u8; 32]>> {
+    let name = crate::device::current_device()?
+        .ok_or_else(|| anyhow::anyhow!("no active device — run `relicario device add` first"))?;
+    let key_pem = crate::device::load_signing_key(&name)?;
+    let private = ssh_key::PrivateKey::from_openssh(key_pem.as_str())
+        .map_err(|e| anyhow::anyhow!("parse device signing key: {e}"))?;
+    let ed = private
+        .key_data()
+        .ed25519()
+        .ok_or_else(|| anyhow::anyhow!("device signing key is not ed25519"))?;
+    // Ed25519PrivateKey derefs to its 32-byte seed.
+    let seed_bytes: &[u8] = ed.private.as_ref();
+    if seed_bytes.len() != 32 {
+        anyhow::bail!("ed25519 seed has wrong length: {}", seed_bytes.len());
+    }
+    let mut seed = Zeroizing::new([0u8; 32]);
+    seed.copy_from_slice(seed_bytes);
+    Ok(seed)
+}
+
+pub(crate) fn atomic_write(path: &Path, data: &[u8]) -> Result<()> {
+    let mut tmp = path.as_os_str().to_owned();
+    tmp.push(".tmp");
+    let tmp = PathBuf::from(tmp);
+    fs::write(&tmp, data).with_context(|| format!("write {}", tmp.display()))?;
+    fs::rename(&tmp, path).with_context(|| format!("rename {}", tmp.display()))?;
+    Ok(())
+}
+
+/// Run `git <args>` in the org repo, capturing output and replaying it on
+/// failure. Unlike `crate::helpers::git_run`, this does NOT inject
+/// `commit.gpgsign=false` / `core.hooksPath=/dev/null`: org commits MUST be
+/// signed (the pre-receive hook verifies every commit's signature), and the
+/// repo's signing config is established by `configure_git_signing` during
+/// `org init`.
+pub(crate) fn org_git_run(root: &Path, args: &[&str], context: &str) -> Result<()> {
+    let output = std::process::Command::new("git")
+        .current_dir(root)
+        .args(args)
+        .output()
+        .with_context(|| format!("{context}: failed to spawn git"))?;
+    if !output.status.success() {
+        if !output.stdout.is_empty() {
+            eprint!("{}", String::from_utf8_lossy(&output.stdout));
+        }
+        if !output.stderr.is_empty() {
+            eprint!("{}", String::from_utf8_lossy(&output.stderr));
+        }
+        anyhow::bail!("{context}: git failed ({})", output.status);
+    }
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use tempfile::TempDir;
+    use std::fs;
+
+    fn make_vault(key: Zeroizing<[u8; 32]>) -> (TempDir, UnlockedOrgVault) {
+        let dir = TempDir::new().unwrap();
+        let root = dir.path().to_path_buf();
+        fs::create_dir_all(root.join("items")).unwrap();
+        fs::create_dir_all(root.join("keys")).unwrap();
+        let vault = UnlockedOrgVault { root, org_key: key };
+        (dir, vault)
+    }
+
+    #[test]
+    fn unlocked_org_vault_paths() {
+        let key = Zeroizing::new([0u8; 32]);
+        let (dir, vault) = make_vault(key);
+        let root = dir.path().to_path_buf();
+        assert_eq!(vault.manifest_path(), root.join("manifest.enc"));
+        assert_eq!(
+            vault.member_key_path(&MemberId("abc0def1abc0def1".into())),
+            root.join("keys/abc0def1abc0def1.enc")
+        );
+        assert_eq!(
+            vault.item_path("prod", &relicario_core::ItemId("0123456789abcdef".into())),
+            root.join("items/prod/0123456789abcdef.enc")
+        );
+    }
+
+    #[test]
+    fn save_and_load_manifest() {
+        let key = Zeroizing::new([0xAAu8; 32]);
+        let (dir, vault) = make_vault(key);
+        let _ = dir; // keep alive
+        let mut m = OrgManifest::new();
+        m.entries.push(relicario_core::OrgManifestEntry {
+            id: relicario_core::ItemId::new(),
+            r#type: relicario_core::ItemType::SecureNote,
+            title: "test".into(),
+            tags: vec![],
+            modified: 0,
+            trashed_at: None,
+            collection: "prod".into(),
+        });
+        vault.save_manifest(&m).unwrap();
+        let loaded = vault.load_manifest().unwrap();
+        assert_eq!(loaded.entries.len(), 1);
+    }
+
+    #[test]
+    fn save_and_load_members() {
+        let key = Zeroizing::new([0u8; 32]);
+        let (dir, vault) = make_vault(key);
+        let _ = dir;
+        let members = OrgMembers::new();
+        vault.save_members(&members).unwrap();
+        let loaded = vault.load_members().unwrap();
+        assert_eq!(loaded.schema_version, 1);
+    }
+}