BoundaryML/baml · error

no parsed result available from function call

Error message

no parsed result available from function call

What it means

try_vm_value_from_function_result expects the function result to contain a parsed output. The parsed() accessor returned None, meaning no parsed result exists for this call (e.g. the function failed to produce a parseable output and the parsed slot was never populated).

Solutions

1. Check the underlying function result/LLM raw output and fix the prompt or output schema so parsing succeeds
2. Strengthen the output type or add BAML retry policies / @check fallbacks so a parsed result is always produced
3. Verify you are using a non-streaming call path that populates the parsed result

// check before use
if fn_result.parsed().is_none() { handle_missing_parse(); }

match call_function(...) { Err(e) if e.to_string().contains("no parsed result") => { /* inspect raw output, fix prompt/schema */ }, ... }

When it happens

Trigger: Calling a function through the async VM runtime where the result's parsed() is None — typically when the LLM response could not be parsed into the output type and the failure was recorded without a parsed payload.

Common situations: LLM returning malformed output that fails parsing; calling a test/streaming path that never sets a parsed result; using the VM runtime on results that only carry raw text.

Related errors

• error parsing function result
• expected `null`, got
• expected `true` or `false`, got
• Failed to parse function result
• {0:?}

AI-assisted analysis of BoundaryML/baml@bd85ce9dee (2026-09-12). Data as JSON: /api/errors/8a751e3c166f7f2e. Report an issue: GitHub.

Appendix: source

Thrown at engine/baml-runtime/src/async_vm_runtime.rs:1349

        }

        BamlValue::Media(media) => Ok(vm.alloc_media(media.clone())),
    }
}

fn try_vm_value_from_function_result(
    vm: &mut Vm,
    resolved_class_names: &HashMap<String, ObjectIndex>,
    resolved_enums_names: &HashMap<String, ObjectIndex>,
    result: anyhow::Result<FunctionResult>,
) -> anyhow::Result<baml_vm::Value> {
    let fn_result = result.context("failed to get function result")?;

    // TODO: Return type of .parsed() sucks.
    let baml_value = fn_result
        .parsed()
        .as_ref()
        .ok_or_else(|| anyhow!("no parsed result available from function call"))?
        .as_ref()
        .map_err(|e| anyhow!("error parsing function result: {e}"))?
        .clone()
        .0
        .value();

    try_vm_value_from_baml_value(vm, resolved_class_names, resolved_enums_names, &baml_value)
}

impl crate::runtime_interface::InternalRuntimeInterface for BamlAsyncVmRuntime {
    fn features(&self) -> crate::internal::ir_features::IrFeatures {
        self.llm_runtime.features()
    }

    fn diagnostics(&self) -> &internal_baml_core::internal_baml_diagnostics::Diagnostics {
        self.llm_runtime.diagnostics()
    }

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