Enum FeatureTier 

pub enum FeatureTier {
    Keyword,
    Semantic,
    Smart,
    Autonomous,
}

Feature tiers control which AI capabilities are active based on the available memory budget on the host machine.

Disambiguation (issue #970)

The codebase has three enums whose names end in Tier. FeatureTier (this enum) is the host capability tier that gates which AI features fit in RAM (0 / 256 MB / 1 GB / 4 GB). It is unrelated to:

• crate::models::Tier — memory-lifecycle TTL bucket (Short/Mid/Long).
• crate::models::ConfidenceTier — confidence-value bucket (Confirmed/Likely/Ambiguous).

They do not share variants, wire strings, or call sites. See docs/internal/enum-proliferation-audit-970.md.

Variants

Keyword

FTS5 keyword search only — 0 MB extra.

Semantic

MiniLM embeddings + HNSW index — ~256 MB.

Smart

nomic-embed + a backend LLM (any configured provider) — ~1 GB.

Autonomous

nomic-embed + a backend LLM (any configured provider) + cross-encoder — ~4 GB.

Implementations

impl FeatureTier

pub fn from_str(s: &str) -> Option<Self>

Parse a tier name (case-insensitive).

pub fn as_str(&self) -> &str

Canonical lowercase name.

pub fn config(self) -> TierConfig

Build the full TierConfig for this tier.

pub fn from_memory_budget(mb: usize) -> Self

Automatically select the best tier that fits within mb megabytes.

Trait Implementations

impl Clone for FeatureTier

fn clone(&self) -> FeatureTier

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for FeatureTier

impl Debug for FeatureTier

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for FeatureTier

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for FeatureTier

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for FeatureTier

impl PartialEq for FeatureTier

fn eq(&self, other: &FeatureTier) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for FeatureTier

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for FeatureTier