Struct PromptFragment 

pub struct PromptFragment {
    pub id: String,
    pub source: String,
    pub bucket: FragmentBucket,
    pub requires_tools: Vec<String>,
    pub requires_caps: Vec<String>,
    pub body: String,
}

One contributor to the system prompt.

body is already rendered (templates run upstream, in .harn or in the reminder pipeline). assemble trims the body and skips empty fragments.

Fields

id: String

Stable, unique-ish identifier, e.g. host:system_preamble, primary, reminder, tool:todo.guidance.

source: String

Who contributed it, for provenance grouping (host:*, primary, reminder, tool:<name>, stdlib:*).

bucket: FragmentBucket

Ordering bucket relative to the primary block.

requires_tools: Vec<String>

Included only if every named tool is present in the active tool set. This is the capability gate: a fragment that says “always update the TODO tracker” carries requires_tools: ["todo"] and disappears when the tool is not registered — instruction and tool can never drift.

requires_caps: Vec<String>

Included only if every named capability flag is set.

body: String

Pre-rendered text. Trimmed by assemble; empty bodies are excluded.

Implementations

impl PromptFragment

pub fn new( id: impl Into<String>, source: impl Into<String>, bucket: FragmentBucket, body: impl Into<String>, ) -> Self

pub fn requiring_tools(self, tools: Vec<String>) -> Self

pub fn requiring_caps(self, caps: Vec<String>) -> Self

Trait Implementations

impl Clone for PromptFragment

fn clone(&self) -> PromptFragment

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PromptFragment

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

Formats the value using the given formatter.