diff --git a/Cargo.toml b/Cargo.toml
index ca4b3eb4..e4a84362 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -86,6 +86,7 @@ clippy.fallible_impl_from = "deny"
 clippy.wildcard_enum_match_arm = "deny"
 clippy.unneeded_field_pattern = "deny"
 clippy.fn_params_excessive_bools = "deny"
+clippy.must_use_candidate = "deny"
 
 [profile.container]
 inherits = "release"
diff --git a/crates/radicle-cli/src/git.rs b/crates/radicle-cli/src/git.rs
index aa51aea0..b91f95f9 100644
--- a/crates/radicle-cli/src/git.rs
+++ b/crates/radicle-cli/src/git.rs
@@ -43,6 +43,7 @@ pub struct Rev(String);
 
 impl Rev {
     /// Return the revision as a string.
+    #[must_use]
     pub fn as_str(&self) -> &str {
         &self.0
     }
diff --git a/crates/radicle-cli/src/git/ddiff.rs b/crates/radicle-cli/src/git/ddiff.rs
index f005ffe7..7157beee 100644
--- a/crates/radicle-cli/src/git/ddiff.rs
+++ b/crates/radicle-cli/src/git/ddiff.rs
@@ -382,6 +382,7 @@ impl DDiff {
     }
 
     /// Returns owned files in the diff.
+    #[must_use]
     pub fn into_files(self) -> Vec<FileDDiff> {
         self.files
     }
diff --git a/crates/radicle-cli/src/git/unified_diff.rs b/crates/radicle-cli/src/git/unified_diff.rs
index a167bec5..3843d0eb 100644
--- a/crates/radicle-cli/src/git/unified_diff.rs
+++ b/crates/radicle-cli/src/git/unified_diff.rs
@@ -33,6 +33,7 @@ impl Error {
         Self::Syntax(msg.to_string())
     }
 
+    #[must_use]
     pub fn is_eof(&self) -> bool {
         match self {
             Self::UnexpectedEof => true,
@@ -137,12 +138,14 @@ impl TryFrom<&Hunk<Modification>> for HunkHeader {
 }
 
 impl HunkHeader {
+    #[must_use]
     pub fn old_line_range(&self) -> std::ops::Range<u32> {
         let start: u32 = self.old_line_no;
         let end: u32 = self.old_line_no + self.old_size;
         start..end + 1
     }
 
+    #[must_use]
     pub fn new_line_range(&self) -> std::ops::Range<u32> {
         let start: u32 = self.new_line_no;
         let end: u32 = self.new_line_no + self.new_size;
@@ -579,6 +582,7 @@ impl<'a> Writer<'a> {
         Ok(())
     }
 
+    #[must_use]
     pub fn styled(mut self, value: bool) -> Self {
         self.styled = value;
         self
diff --git a/crates/radicle-cli/src/node.rs b/crates/radicle-cli/src/node.rs
index 518f4f98..4db7efc3 100644
--- a/crates/radicle-cli/src/node.rs
+++ b/crates/radicle-cli/src/node.rs
@@ -25,12 +25,14 @@ pub struct SyncSettings {
 
 impl SyncSettings {
     /// Set sync timeout. Defaults to [`DEFAULT_SYNC_TIMEOUT`].
+    #[must_use]
     pub fn timeout(mut self, timeout: time::Duration) -> Self {
         self.timeout = timeout;
         self
     }
 
     /// Set replicas.
+    #[must_use]
     pub fn replicas(mut self, replicas: sync::ReplicationFactor) -> Self {
         self.replicas = replicas;
         self
@@ -44,6 +46,7 @@ impl SyncSettings {
 
     /// Use profile to populate sync settings, by adding preferred seeds if no seeds are specified,
     /// and removing the local node from the set.
+    #[must_use]
     pub fn with_profile(mut self, profile: &Profile) -> Self {
         // If no seeds were specified, add the preferred seeds.
         if self.seeds.is_empty() {
diff --git a/crates/radicle-cli/src/terminal/cob.rs b/crates/radicle-cli/src/terminal/cob.rs
index 1f1b8be4..7086c4c3 100644
--- a/crates/radicle-cli/src/terminal/cob.rs
+++ b/crates/radicle-cli/src/terminal/cob.rs
@@ -51,6 +51,7 @@ pub mod migrate {
     use super::MigrateSpinner;
 
     /// Display migration progress via a spinner.
+    #[must_use]
     pub fn spinner() -> MigrateSpinner {
         MigrateSpinner::default()
     }
diff --git a/crates/radicle-cli/src/terminal/format.rs b/crates/radicle-cli/src/terminal/format.rs
index 05440a02..2e026cd7 100644
--- a/crates/radicle-cli/src/terminal/format.rs
+++ b/crates/radicle-cli/src/terminal/format.rs
@@ -17,6 +17,7 @@ use radicle_term::element::Line;
 use crate::terminal as term;
 
 /// Format a node id to be more compact.
+#[must_use]
 pub fn node_id_human_compact(node: &NodeId) -> Paint<String> {
     let node = node.to_human();
     let start = node.chars().take(7).collect::<String>();
@@ -26,10 +27,12 @@ pub fn node_id_human_compact(node: &NodeId) -> Paint<String> {
 }
 
 /// Format a node id.
+#[must_use]
 pub fn node_id_human(node: &NodeId) -> Paint<String> {
     Paint::new(node.to_human())
 }
 
+#[must_use]
 pub fn addr_compact(address: &Address) -> Paint<String> {
     let host = match address.host() {
         HostName::Ip(ip) => ip.to_string(),
@@ -72,17 +75,20 @@ pub fn command<D: fmt::Display>(cmd: D) -> Paint<String> {
 }
 
 /// Format a COB id.
+#[must_use]
 pub fn cob(id: &ObjectId) -> Paint<String> {
     Paint::new(format!("{:.7}", id.to_string()))
 }
 
 /// Format a DID.
+#[must_use]
 pub fn did(did: &Did) -> Paint<String> {
     let nid = did.as_key().to_human();
     Paint::new(format!("{}…{}", &nid[..7], &nid[nid.len() - 7..]))
 }
 
 /// Format a Visibility.
+#[must_use]
 pub fn visibility(v: &Visibility) -> Paint<&str> {
     match v {
         Visibility::Public => term::format::positive("public"),
@@ -91,6 +97,7 @@ pub fn visibility(v: &Visibility) -> Paint<&str> {
 }
 
 /// Format a policy.
+#[must_use]
 pub fn policy(p: &Policy) -> Paint<String> {
     match p {
         Policy::Allow => term::format::positive(p.to_string()),
@@ -108,6 +115,7 @@ pub fn timestamp(time: impl Into<LocalTime>) -> Paint<String> {
     Paint::new(fmt.convert(duration.into()))
 }
 
+#[must_use]
 pub fn bytes(size: usize) -> Paint<String> {
     const KB: usize = 1024;
     const MB: usize = 1024usize.pow(2);
@@ -125,6 +133,7 @@ pub fn bytes(size: usize) -> Paint<String> {
 }
 
 /// Format a ref update.
+#[must_use]
 pub fn ref_update(update: &RefUpdate) -> Paint<&'static str> {
     match update {
         RefUpdate::Updated { .. } => term::format::tertiary("updated"),
@@ -134,6 +143,7 @@ pub fn ref_update(update: &RefUpdate) -> Paint<&'static str> {
     }
 }
 
+#[must_use]
 pub fn ref_update_verbose(update: &RefUpdate) -> Paint<String> {
     match update {
         RefUpdate::Created { name, .. } => format!(
@@ -175,6 +185,7 @@ pub struct Identity<'a> {
 }
 
 impl<'a> Identity<'a> {
+    #[must_use]
     pub fn new(profile: &'a Profile) -> Self {
         Self {
             profile,
@@ -183,11 +194,13 @@ impl<'a> Identity<'a> {
         }
     }
 
+    #[must_use]
     pub fn short(mut self) -> Self {
         self.short = true;
         self
     }
 
+    #[must_use]
     pub fn styled(mut self) -> Self {
         self.styled = true;
         self
@@ -227,6 +240,7 @@ pub struct Author<'a> {
 }
 
 impl<'a> Author<'a> {
+    #[must_use]
     pub fn new(nid: &'a NodeId, profile: &Profile, verbose: bool) -> Author<'a> {
         let alias = profile.alias(nid);
 
@@ -238,10 +252,12 @@ impl<'a> Author<'a> {
         }
     }
 
+    #[must_use]
     pub fn alias(&self) -> Option<term::Label> {
         self.alias.as_ref().map(|a| a.to_string().into())
     }
 
+    #[must_use]
     pub fn you(&self) -> Option<term::Label> {
         if self.you {
             Some(term::format::primary("(you)").dim().italic().into())
@@ -256,6 +272,7 @@ impl<'a> Author<'a> {
     ///   * `(<did>, (you))` -- the `Author` is the local peer and has no alias
     ///   * `(<alias>, <did>)` -- the `Author` is another peer and has an alias
     ///   * `(<blank>, <did>)` -- the `Author` is another peer and has no alias
+    #[must_use]
     pub fn labels(self) -> (term::Label, term::Label) {
         let node_id = if self.verbose {
             term::format::node_id_human(self.nid)
@@ -274,6 +291,7 @@ impl<'a> Author<'a> {
         (alias, author)
     }
 
+    #[must_use]
     pub fn line(self) -> Line {
         let (alias, author) = self.labels();
         Line::spaced([alias, author])
@@ -283,6 +301,7 @@ impl<'a> Author<'a> {
 /// HTML-related formatting.
 pub mod html {
     /// Comment a string with HTML comments.
+    #[must_use]
     pub fn commented(s: &str) -> String {
         format!("<!--\n{s}\n-->")
     }
@@ -290,6 +309,7 @@ pub mod html {
     /// Remove html style comments from a string.
     ///
     /// The HTML comments must start at the beginning of a line and stop at the end.
+    #[must_use]
     pub fn strip_comments(s: &str) -> String {
         let ends_with_newline = s.ends_with('\n');
         let mut is_comment = false;
@@ -323,6 +343,7 @@ pub mod issue {
     use radicle::issue::{CloseReason, State};
 
     /// Format issue state.
+    #[must_use]
     pub fn state(s: &State) -> term::Paint<String> {
         match s {
             State::Open => term::format::positive(s.to_string()),
@@ -341,6 +362,7 @@ pub mod patch {
     use super::*;
     use radicle::patch::{State, Verdict};
 
+    #[must_use]
     pub fn verdict(v: Option<Verdict>) -> term::Paint<String> {
         match v {
             Some(Verdict::Accept) => term::PREFIX_SUCCESS.into(),
@@ -350,6 +372,7 @@ pub mod patch {
     }
 
     /// Format patch state.
+    #[must_use]
     pub fn state(s: &State) -> term::Paint<String> {
         match s {
             State::Draft => term::format::dim(s.to_string()),
@@ -366,6 +389,7 @@ pub mod identity {
     use radicle::cob::identity::State;
 
     /// Format identity revision state.
+    #[must_use]
     pub fn state(s: &State) -> term::Paint<String> {
         match s {
             State::Active => term::format::tertiary(s.to_string()),
diff --git a/crates/radicle-cli/src/terminal/highlight.rs b/crates/radicle-cli/src/terminal/highlight.rs
index b62f9420..e5f04ef4 100644
--- a/crates/radicle-cli/src/terminal/highlight.rs
+++ b/crates/radicle-cli/src/terminal/highlight.rs
@@ -59,6 +59,7 @@ impl Default for Theme {
 
 impl Theme {
     /// Get the named color.
+    #[must_use]
     pub fn color(&self, color: &'static str) -> term::Color {
         if let Some(c) = (self.color)(color) {
             c
@@ -68,6 +69,7 @@ impl Theme {
     }
 
     /// Return the color of a syntax group.
+    #[must_use]
     pub fn highlight(&self, group: &'static str) -> Option<term::Color> {
         let color = match group {
             "keyword" => self.color("red"),
diff --git a/crates/radicle-cli/src/terminal/io.rs b/crates/radicle-cli/src/terminal/io.rs
index 77c6cf2a..e37d8b3d 100644
--- a/crates/radicle-cli/src/terminal/io.rs
+++ b/crates/radicle-cli/src/terminal/io.rs
@@ -21,6 +21,7 @@ pub struct PassphraseValidator {
 
 impl PassphraseValidator {
     /// Create a new validator.
+    #[must_use]
     pub fn new(keystore: Keystore) -> Self {
         Self { keystore }
     }
diff --git a/crates/radicle-cli/src/terminal/patch.rs b/crates/radicle-cli/src/terminal/patch.rs
index daf823a8..5d5599ad 100644
--- a/crates/radicle-cli/src/terminal/patch.rs
+++ b/crates/radicle-cli/src/terminal/patch.rs
@@ -140,6 +140,7 @@ blank is also okay.
 
 /// Combine the title and description fields to display to the user.
 #[inline]
+#[must_use]
 pub fn message(title: &str, description: &str) -> String {
     format!("{title}\n\n{description}").trim().to_string()
 }
diff --git a/crates/radicle-cli/src/terminal/upload_pack.rs b/crates/radicle-cli/src/terminal/upload_pack.rs
index 6e3db7bf..ab4cf0eb 100644
--- a/crates/radicle-cli/src/terminal/upload_pack.rs
+++ b/crates/radicle-cli/src/terminal/upload_pack.rs
@@ -22,6 +22,7 @@ impl Default for UploadPack {
 
 impl UploadPack {
     /// Construct an empty set of spinners.
+    #[must_use]
     pub fn new() -> Self {
         Self {
             remotes: BTreeSet::new(),
diff --git a/crates/radicle-core/src/repo.rs b/crates/radicle-core/src/repo.rs
index 0ef25438..347ba18d 100644
--- a/crates/radicle-core/src/repo.rs
+++ b/crates/radicle-core/src/repo.rs
@@ -47,6 +47,7 @@ impl RepoId {
     ///
     /// Eg. `rad:z3XncAdkZjeK9mQS5Sdc4qhw98BUX`.
     ///
+    #[must_use]
     pub fn urn(&self) -> String {
         RAD_PREFIX.to_string() + &self.canonical()
     }
@@ -65,6 +66,7 @@ impl RepoId {
     ///
     /// Eg. `z3XncAdkZjeK9mQS5Sdc4qhw98BUX`.
     ///
+    #[must_use]
     pub fn canonical(&self) -> String {
         multibase::encode(multibase::Base::Base58Btc, AsRef::<[u8]>::as_ref(&self.0))
     }
diff --git a/crates/radicle-localtime/src/lib.rs b/crates/radicle-localtime/src/lib.rs
index 0c1d3d05..6eaa0cec 100644
--- a/crates/radicle-localtime/src/lib.rs
+++ b/crates/radicle-localtime/src/lib.rs
@@ -50,6 +50,7 @@ impl LocalTime {
     }
 
     /// Construct a local time from whole seconds since Epoch.
+    #[must_use]
     pub const fn from_secs(secs: u64) -> Self {
         Self {
             millis: secs as u128 * 1000,
@@ -57,16 +58,19 @@ impl LocalTime {
     }
 
     /// Construct a local time from milliseconds since Epoch.
+    #[must_use]
     pub const fn from_millis(millis: u128) -> Self {
         Self { millis }
     }
 
     /// Return whole seconds since Epoch.
+    #[must_use]
     pub fn as_secs(&self) -> u64 {
         (self.millis / 1000).try_into().unwrap()
     }
 
     /// Return milliseconds since Epoch.
+    #[must_use]
     pub fn as_millis(&self) -> u64 {
         self.millis.try_into().unwrap()
     }
@@ -76,6 +80,7 @@ impl LocalTime {
     /// # Panics
     ///
     /// This function will panic if `earlier` is later than `self`.
+    #[must_use]
     pub fn duration_since(&self, earlier: LocalTime) -> LocalDuration {
         LocalDuration::from_millis(
             self.millis
@@ -85,6 +90,7 @@ impl LocalTime {
     }
 
     /// Get the difference between two times.
+    #[must_use]
     pub fn diff(&self, other: LocalTime) -> LocalDuration {
         if self > &other {
             self.duration_since(other)
@@ -149,31 +155,37 @@ impl LocalDuration {
     pub const MAX: LocalDuration = LocalDuration(u128::MAX);
 
     /// Create a new duration from whole seconds.
+    #[must_use]
     pub const fn from_secs(secs: u64) -> Self {
         Self(secs as u128 * 1000)
     }
 
     /// Create a new duration from whole minutes.
+    #[must_use]
     pub const fn from_mins(mins: u64) -> Self {
         Self::from_secs(mins * 60)
     }
 
     /// Construct a new duration from milliseconds.
+    #[must_use]
     pub const fn from_millis(millis: u128) -> Self {
         Self(millis)
     }
 
     /// Return the number of minutes in this duration.
+    #[must_use]
     pub const fn as_mins(&self) -> u64 {
         self.as_secs() / 60
     }
 
     /// Return the number of seconds in this duration.
+    #[must_use]
     pub const fn as_secs(&self) -> u64 {
         (self.0 / 1000) as u64
     }
 
     /// Return the number of milliseconds in this duration.
+    #[must_use]
     pub const fn as_millis(&self) -> u128 {
         self.0
     }