Struct Args 

pub struct Args {

    pub memory_file: Option<String>,
    pub transport: Transport,
    pub bind: String,
    pub log_level: String,
    pub auth_token: Option<String>,
    pub auth_token_file: Option<String>,
    pub mmap_size: i64,
    pub page_size: i64,
    pub cache_size_mb: i64,
    pub busy_timeout_ms: u64,
    pub wal_flush_ms: u64,
    pub lru_cache_size: usize,
    pub read_pool_size: usize,
    pub tls_cert: Option<String>,
    pub tls_key: Option<String>,
    pub vectors: bool,
    pub embedding_dims: u32,
    pub vec_metric: VecMetric,
    pub vec_quantization: VecQuant,
    pub vec_connectivity: usize,
    pub vec_expansion_add: usize,
    pub vec_expansion_search: usize,
    pub vec_index: VecIndex,
    pub ivf_nlist: usize,
    pub ivf_nprobe: usize,
}

Fields

memory_file: Option<String>

Path to the memory file

transport: Transport

Transport to listen on: stdio, tcp, or http

bind: String

Address to bind for the tcp and http transports

log_level: String

Log level

auth_token: Option<String>

Bearer token required on the tcp (first line) and http (Authorization header) transports. Overrides --auth-token-file and the MCP_MEMORY_AUTH_TOKEN env var. stdio is never authenticated.

auth_token_file: Option<String>

Path to a file whose trimmed contents are the bearer token. An empty file is rejected (fail closed). Ignored if --auth-token is set.

mmap_size: i64

SQLite mmap size in bytes (default: 256 MiB).

page_size: i64

SQLite page size in bytes; power of two (default: 4096, matches the Linux page / filesystem block size). Only applies to a freshly-created database.

cache_size_mb: i64

SQLite page cache size in MiB (default: 50).

busy_timeout_ms: u64

SQLite busy timeout in milliseconds (default: 5000).

wal_flush_ms: u64

Interval in milliseconds for a background wal_checkpoint(PASSIVE) that bounds the durability window in async mode (default: 250). 0 disables it.

lru_cache_size: usize

Entity-metadata LRU cache capacity (0 falls back to 10000).

read_pool_size: usize

Number of read-only SQLite connections backing concurrent reads. WAL mode allows readers to run in parallel with each other and the single writer; a larger pool raises read concurrency at the cost of a little memory (each connection carries its own page cache). 0 (default) auto-scales to the CPU count, clamped to [1, 32].

tls_cert: Option<String>

Path to a PEM certificate chain to serve the http transport over TLS (HTTPS). Requires –tls-key. Falls back to the MCP_TLS_CERT env var. When unset, the http transport stays plaintext.

tls_key: Option<String>

Path to the PEM private key matching –tls-cert. Falls back to the MCP_TLS_KEY env var.

vectors: bool

Enable vector / semantic search: exposes the vector_* and hybrid_search tools backed by a usearch HNSW index. Off by default (a pure knowledge-graph server). The --embedding-dims / --vec-* flags only take effect when this is set.

embedding_dims: u32

Embedding dimension for vector search (default: 384). Requires –vectors.

vec_metric: VecMetric

Distance metric for the vector index. Requires –vectors.

vec_quantization: VecQuant

Scalar quantization for the vector index (lower = less memory). Requires –vectors.

vec_connectivity: usize

HNSW graph degree M (higher = better recall, more memory). Requires –vectors.

vec_expansion_add: usize

HNSW efConstruction (higher = better index quality, slower inserts). Requires –vectors.

vec_expansion_search: usize

HNSW efSearch (higher = better recall, slower queries). Requires –vectors.

vec_index: VecIndex

ANN index backend: hnsw (default) or ivf (IVF-Flat). Requires –vectors.

ivf_nlist: usize

IVF: number of Voronoi cells / centroids (default: 256). Requires –vec-index ivf.

ivf_nprobe: usize

IVF: cells probed per query — higher = better recall, slower (default: 8). Requires –vec-index ivf.

Implementations

impl Args

pub fn vector_config(&self) -> VectorConfig

Build the vector index configuration from the --embedding-dims / --vec-* / --ivf-* flags. Only meaningful when --vectors is set.

Trait Implementations

impl Args for Args

fn group_id() -> Option<Id>

Report the ArgGroup::id for this set of arguments

fn augment_args<'b>(__clap_app: Command) -> Command

Append to Command so it can instantiate Self via FromArgMatches::from_arg_matches_mut

fn augment_args_for_update<'b>(__clap_app: Command) -> Command

Append to Command so it can instantiate self via FromArgMatches::update_from_arg_matches_mut

impl CommandFactory for Args

fn command<'b>() -> Command

Build a Command that can instantiate Self.

fn command_for_update<'b>() -> Command

Build a Command that can update self.

impl Debug for Args

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

Formats the value using the given formatter.

impl FromArgMatches for Args

fn from_arg_matches(__clap_arg_matches: &ArgMatches) -> Result<Self, Error>

Instantiate Self from ArgMatches, parsing the arguments as needed.

fn from_arg_matches_mut( __clap_arg_matches: &mut ArgMatches, ) -> Result<Self, Error>

Instantiate Self from ArgMatches, parsing the arguments as needed.

fn update_from_arg_matches( &mut self, __clap_arg_matches: &ArgMatches, ) -> Result<(), Error>

Assign values from ArgMatches to self.

fn update_from_arg_matches_mut( &mut self, __clap_arg_matches: &mut ArgMatches, ) -> Result<(), Error>

Assign values from ArgMatches to self.

impl Parser for Args

fn parse() -> Self

Parse from std::env::args_os(), exit on error.

fn try_parse() -> Result<Self, Error>

Parse from std::env::args_os(), return Err on error.

fn parse_from<I, T>(itr: I) -> Self

where I: IntoIterator<Item = T>, T: Into<OsString> + Clone,

Parse from iterator, exit on error.

fn try_parse_from<I, T>(itr: I) -> Result<Self, Error>

where I: IntoIterator<Item = T>, T: Into<OsString> + Clone,

Parse from iterator, return Err on error.

fn update_from<I, T>(&mut self, itr: I)

where I: IntoIterator<Item = T>, T: Into<OsString> + Clone,

Update from iterator, exit on error.

fn try_update_from<I, T>(&mut self, itr: I) -> Result<(), Error>

where I: IntoIterator<Item = T>, T: Into<OsString> + Clone,

Update from iterator, return Err on error.