Struct Routing 

pub struct Routing {
    pub aliases: Vec<(String, String)>,
    pub models: Vec<(String, ModelRules)>,
    pub defaults: ModelRules,
    pub allowed: Vec<String>,
    pub denied: Vec<String>,
    pub provider: Option<String>,
    pub account: Option<String>,
}

The whole resolved routing table, carried on crate::Config::model_routing and consulted by every routing decision.

It keeps the PATTERNS rather than one pre-resolved answer on purpose: a mid-session model switch has to re-decide effort, budget, tier and tool bits for the NEW model, and it does that by asking this same value again (Routing::rules_for) rather than by re-reading config elsewhere.

Fields

aliases: Vec<(String, String)>

Alias → slug entries from the config, in precedence order: the declared account’s scope, then the declared provider’s, then the flat table. Consulted before DEFAULT_ALIASES. A key may be a * pattern, in which case the value may contain {} — replaced by the captured stem after that stem is itself alias-resolved (Claude Code’s sonnet[1m] shape).

models: Vec<(String, ModelRules)>

[capabilities.model_catalog.models.<pattern>], least specific first, so overlaying in order leaves the most specific rule winning.

defaults: ModelRules

The table’s own top-level rules — the baseline every model inherits.

allowed: Vec<String>

allowed_models: when non-empty, a model matching NO entry is refused outright.

denied: Vec<String>

denied_models: a model matching any entry is refused outright.

provider: Option<String>

The declared provider whose alias scope is in force (provider).

account: Option<String>

The declared account/plan tier whose alias scope is in force (account) — Claude Code’s account-type defaults (cc§9).

Implementations

impl Routing

pub fn resolve_alias(&self, model: &str) -> String

Expand a friendly model name to a full slug through this table, then DEFAULT_ALIASES, then unchanged pass-through.

Exact entries always beat patterns, and among patterns the most specific wins. A pattern’s {} placeholder receives the captured stem RE-RESOLVED through this same function (depth-capped), which is what makes sonnet[1m] land on anthropic/claude-sonnet-4-6[1m] rather than on the literal text sonnet[1m].

pub fn rules_for(&self, model: &str) -> ModelRules

The rules in force for model: the table defaults with every matching models.<pattern> overlaid, least specific first.

pub fn effective_effort( &self, model: &str, session_effort: Option<&str>, ) -> Option<String>

The effort level to send for model, given the session’s [core] effort: the per-model level if one is set, else the session level, clamped by whichever effort cap applies.

pub fn refusal(&self, model: &str) -> Option<String>

Why model is refused, or None when it is allowed — the CONFIG-layer half of the org model allowlist. A denied model can never be selected, and with an allowlist set nothing outside it can.

pub fn restricts_models(&self) -> bool

Whether anything in this table restricts model choice at all.

pub fn from_capabilities( capabilities: &BTreeMap<String, CapabilityConfig>, ) -> Routing

Build the routing table from [capabilities.model_catalog].

Consulted regardless of the module’s enabled flag, for the same reason resolve is: these are data a caller resolves against, not an activation switch (and the D-9 resolver check already reads small_model unconditionally).

Trait Implementations

impl Clone for Routing

fn clone(&self) -> Routing

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Routing

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

Formats the value using the given formatter.

impl Default for Routing

fn default() -> Routing

Returns the “default value” for a type.

impl Eq for Routing

impl PartialEq for Routing

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Routing