Struct ToolCallResult 

pub struct ToolCallResult {
    pub content: Vec<ContentItem>,
    pub is_error: Option<bool>,
}

What a tools/call returns: the text a model will read.

Every handler in crate::context produces one of these, and the renderers in crate::render decide what goes in it — the text IS the API (each experiment-pool result ends with a next: line and carries its run_dir:), so this type stays a thin envelope.

Fields

content: Vec<ContentItem>

The content items, concatenated by content_text when a caller wants the single string a model sees.

is_error: Option<bool>

Some(true) when the tool failed. MCP keeps tool failure inside a successful response — the model reads the error text and can react to it, unlike a protocol-level JsonRpcError.

Implementations

impl ToolCallResult

pub fn text(s: impl Into<String>) -> Self

A successful result carrying one text block.

pub fn error(s: impl Into<String>) -> Self

A failed result: the same text block, flagged isError so the model knows it is reading a failure, not an answer.

pub fn content_text(&self) -> String

The text a model would see — every content item concatenated. The protocol carries text, so this is the whole result.

pub fn is_error(&self) -> bool

Whether this result is an error; an absent flag means success.

Trait Implementations

impl Debug for ToolCallResult

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

Formats the value using the given formatter.

impl Serialize for ToolCallResult

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

where __S: Serializer,

Serialize this value into the given Serde serializer.