pub enum SpanKind {
Show 21 variants
Pipeline,
FnCall,
LlmCall,
ToolCall,
Import,
Parallel,
Spawn,
Step,
VmSetup,
Suspension,
Resume,
Drain,
DrainDecision,
PoolSubmit,
PoolDequeue,
ChannelEmit,
ChannelMatch,
UserTiming,
ModelRoute,
ToolMount,
DeferredToolLoad,
}Expand description
The kind of operation a span represents.
Variants§
Pipeline
FnCall
LlmCall
ToolCall
Import
Parallel
Spawn
Step
A @step-annotated function while its frame is on the call stack.
VmSetup
Host-side VM setup before user bytecode starts executing.
Suspension
Cooperative worker suspension while the durable checkpoint is written.
Resume
Worker resumption after a cooperative suspension.
Drain
Pipeline drain / settlement phase.
DrainDecision
One drain settlement decision.
PoolSubmit
pool.submit() boundary — accepted, rejected, or queued (PL-06).
PoolDequeue
Pool worker picks the task out of the queue (PL-06). Links back to
the originating PoolSubmit span across the async boundary so
queue dwell time can be reconstructed from a single trace.
ChannelEmit
emit_channel(...) boundary — opened at emit_channel, closed
after the durable append + trigger fan-out finishes (CH-06 / #1877).
ChannelMatch
Channel-source trigger match boundary — opened at trigger fan-out
just before the handler is invoked, closed once dispatch finishes.
Links back to the originating ChannelEmit span (multi-link for
batched / aggregated triggers).
UserTiming
Script-opened user timing span via std/timing. Modeled as an
OTel INTERNAL span — distinct from FnCall so OTel exporters and
harn run --profile-json do not confuse them with LLM/tool work.
ModelRoute
A model routing / escalation decision — the agent switched the
serving model mid-run. Metadata carries from_model, to_model,
and reason (see meta). Emitted as a zero-duration marker at
the decision point so viewers can annotate the flame graph with the
switch instead of inferring it from adjacent llm_call models.
ToolMount
A batch of tools promoted into the active surface (MCP bootstrap,
skill activation, or a search-driven mount). Metadata carries
tool_names, tool_count, source, and an optional detail.
DeferredToolLoad
A single deferred tool schema promoted via tool_search. Metadata
carries tool_name, query, and the match score.
Implementations§
Trait Implementations§
impl Copy for SpanKind
impl Eq for SpanKind
impl StructuralPartialEq for SpanKind
Auto Trait Implementations§
impl Freeze for SpanKind
impl RefUnwindSafe for SpanKind
impl Send for SpanKind
impl Sync for SpanKind
impl Unpin for SpanKind
impl UnsafeUnpin for SpanKind
impl UnwindSafe for SpanKind
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