Meta

Struct Meta 

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pub struct Meta {
    pub progress_token: Option<ProgressToken>,
    pub cursor: Option<Cursor>,
    pub total: Option<u64>,
    pub has_more: Option<bool>,
    pub estimated_remaining_seconds: Option<f64>,
    pub progress: Option<f64>,
    pub current_step: Option<u64>,
    pub total_steps: Option<u64>,
    pub extra: HashMap<String, Value>,
}
Expand description

Structured _meta field for MCP 2025-06-18

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§progress_token: Option<ProgressToken>

Progress token for tracking long-running operations

§cursor: Option<Cursor>

Cursor for pagination

§total: Option<u64>

Total number of items (for pagination context)

§has_more: Option<bool>

Whether there are more items available

§estimated_remaining_seconds: Option<f64>

Estimated remaining time in seconds

§progress: Option<f64>

Current progress (0.0 to 1.0)

§current_step: Option<u64>

Current step in a multi-step process

§total_steps: Option<u64>

Total steps in a multi-step process

§extra: HashMap<String, Value>

Additional metadata as key-value pairs

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impl Meta

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pub fn new() -> Meta

Create a new empty Meta

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pub fn with_progress_token(token: impl Into<ProgressToken>) -> Meta

Create Meta with progress token

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pub fn with_cursor(cursor: impl Into<Cursor>) -> Meta

Create Meta with cursor for pagination

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pub fn with_pagination( cursor: Option<Cursor>, total: Option<u64>, has_more: bool, ) -> Meta

Create Meta with pagination info

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pub fn with_progress( progress: f64, current_step: Option<u64>, total_steps: Option<u64>, ) -> Meta

Create Meta with progress information

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pub fn set_progress_token(self, token: impl Into<ProgressToken>) -> Meta

Add progress token

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pub fn set_cursor(self, cursor: impl Into<Cursor>) -> Meta

Add cursor

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pub fn set_pagination( self, cursor: Option<Cursor>, total: Option<u64>, has_more: bool, ) -> Meta

Set pagination info

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pub fn set_progress( self, progress: f64, current_step: Option<u64>, total_steps: Option<u64>, ) -> Meta

Set progress info

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pub fn set_estimated_remaining(self, seconds: f64) -> Meta

Set estimated remaining time

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pub fn add_extra(self, key: impl Into<String>, value: impl Into<Value>) -> Meta

Add extra metadata

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pub fn is_empty(&self) -> bool

Check if meta has any content

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pub fn merge_request_extras( self, request_meta: Option<&HashMap<String, Value>>, ) -> Meta

Merge request extras from incoming request _meta into this Meta This helper preserves pagination context while adding request metadata

Trait Implementations§

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impl Clone for Meta

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fn clone(&self) -> Meta

Returns a duplicate of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for Meta

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

Formats the value using the given formatter. Read more
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impl Default for Meta

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fn default() -> Meta

Returns the “default value” for a type. Read more
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impl<'de> Deserialize<'de> for Meta

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fn deserialize<__D>( __deserializer: __D, ) -> Result<Meta, <__D as Deserializer<'de>>::Error>
where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more
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impl Serialize for Meta

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

Serialize this value into the given Serde serializer. Read more

Auto Trait Implementations§

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impl Freeze for Meta

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impl RefUnwindSafe for Meta

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impl Send for Meta

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impl Sync for Meta

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impl Unpin for Meta

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impl UnwindSafe for Meta

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T> DeserializeOwned for T
where T: for<'de> Deserialize<'de>,