From 7daeb3135b9a264e71b631b6896339bea7784590 Mon Sep 17 00:00:00 2001
From: Fintan Halpenny <fintan.halpenny@gmail.com>
Date: Thu, 2 Jul 2026 16:27:06 +0000
Subject: [PATCH] radicle/cob/identity: Add SiblingAccepted error variant

Add an `ApplyError` for variant, `SiblingAccepted`, to use to enforce the new
invariant: delegates must not accept active, sibling revisions.
---
 crates/radicle-cli/src/commands/id.rs | 1 +
 crates/radicle/src/cob/identity.rs    | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/crates/radicle-cli/src/commands/id.rs b/crates/radicle-cli/src/commands/id.rs
index 3fc9df01..27fc3f13 100644
--- a/crates/radicle-cli/src/commands/id.rs
+++ b/crates/radicle-cli/src/commands/id.rs
@@ -501,6 +501,7 @@ fn on_apply_err(e: &identity::ApplyError, profile: &Profile) -> anyhow::Error {
         | e @ radicle::cob::identity::ApplyError::MissingParent
         | e @ radicle::cob::identity::ApplyError::DuplicateVerdict
         | e @ radicle::cob::identity::ApplyError::UnexpectedState
+        | e @ radicle::cob::identity::ApplyError::SiblingAccepted
         | e @ radicle::cob::identity::ApplyError::DocUnchanged
         | e @ radicle::cob::identity::ApplyError::Git(_)
         | e @ radicle::cob::identity::ApplyError::Doc(_)
diff --git a/crates/radicle/src/cob/identity.rs b/crates/radicle/src/cob/identity.rs
index a833bb07..aec69575 100644
--- a/crates/radicle/src/cob/identity.rs
+++ b/crates/radicle/src/cob/identity.rs
@@ -122,6 +122,8 @@ pub enum ApplyError {
     DuplicateVerdict,
     #[error("revision is in an unexpected state")]
     UnexpectedState,
+    #[error("delegate already accepted a sibling revision '{revision}'")]
+    SiblingAccepted { revision: RevisionId },
     #[error("document does not contain any changes to current identity")]
     DocUnchanged,
     #[error("git: {0}")]