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SystemMessagePlacement

harn_vm::llm::capabilities

Enum SystemMessagePlacement 

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pub enum SystemMessagePlacement {
    Inline,
    NativeDirective,
    Fold,
}
Expand description

How a route carries a system/developer-role message that appears at a non-leading position in the conversation — the operator-instruction channel (OpenAI developer messages, Anthropic mid-conversation system messages). Leading system content is always the system prompt; this governs only the interleaved case. Typed so an unknown value in a capability source fails the load loudly. None on Capabilities derives a safe default from the wire dialect — see resolve_system_message_placement.

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Inline

The wire API accepts a system/developer message verbatim at any position (OpenAI Chat Completions & Responses, Ollama). Pass through.

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NativeDirective

The API accepts an interleaved system-role directive but enforces placement rules (Anthropic Opus 4.8: one message must follow a user turn — or an assistant turn ending in server_tool_use — and be the last message or be followed by an assistant turn; never messages[0]). A valid consecutive section is merged and kept native; anything else folds. developer collapses to system (Anthropic has no developer role).

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Fold

The API has no positional system channel (Anthropic pre-4.8, Gemini systemInstruction, Bedrock Converse system[]). A leading run folds into the top-level system prompt; an interleaved directive folds into the adjacent user turn as a <system-reminder> block so its position and operator intent survive. Never 400s, never silently repositioned to the global system prompt.

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impl Clone for SystemMessagePlacement

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fn clone(&self) -> SystemMessagePlacement

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

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

Performs copy-assignment from source. Read more
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impl Copy for SystemMessagePlacement

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impl Debug for SystemMessagePlacement

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

Formats the value using the given formatter. Read more
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impl<'de> Deserialize<'de> for SystemMessagePlacement

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

Deserialize this value from the given Serde deserializer. Read more
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impl Eq for SystemMessagePlacement

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impl PartialEq for SystemMessagePlacement

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

Equality operator ==. Read more
1.0.0 (const: unstable) · Source§

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

Inequality operator !=. Read more
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impl Serialize for SystemMessagePlacement

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

Serialize this value into the given Serde serializer. Read more
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impl StructuralPartialEq for SystemMessagePlacement

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