What causes "write function requires payload argument" in dbt-labs/dbt-core?

Pass the payload string as the first argument: {{ write(my_payload) }}.

dbt-labs/dbt-core · error · minijinja::Error (InvalidOperation)

write function requires payload argument

Error message

write function requires payload argument

What it means

The write() function exposed on the run-node context requires at least one argument: the payload to write. Called with no arguments, it raises immediately because there is nothing to serialize to the artifact file.

Solutions

Pass the payload string as the first argument: {{ write(my_payload) }}.
Check that the variable holding the payload is not accidentally omitted during a refactor.
Guard the call site: only call write when content is available.

Example fix

-- before
{{ write() }}
-- after
{{ write(log_message | string) }}

Defensive patterns

Strategy: validation

Validate before calling

-- Jinja
{% if payload is defined and payload is not none %}
  {{ write(payload | string) }}
{% endif %}

Try / catch

// Rust-side programmatic invocation
if args.is_empty() {
    return Err(Error::new(ErrorKind::InvalidOperation, "write requires a payload argument"));
}

Prevention

Always pass payload explicitly to write(); never dispatch it dynamically with a possibly-empty arg list.
Keep write() call sites in one macro so arity mistakes surface in one place.
Add a smoke test invoking write with a trivial payload.

When it happens

Trigger: Invoking the write callable from Jinja with zero arguments, e.g. {{ write() }} or assigning write to a variable and calling it without args.

Common situations: Typo where an argument is computed conditionally and the call still happens; macro refactors that drop the payload argument; dynamic dispatch where args list is built programmatically and ends up empty.

Understand the failure class

Background: "missing required argument" and "the following required arguments were not provided": what required-argument errors mean and how to fix them — this error's family across 20 libraries.

Related errors

AI-assisted analysis of dbt-labs/dbt-core@0267ce9170 (2026-09-07). Data as JSON: /api/errors/3a00b827f934d43b. Report an issue: GitHub.

Appendix: source

Thrown at crates/dbt-jinja-utils/src/phases/run/run_node_context.rs:690

/// Context function that writes a payload to file
#[derive(Debug)]
pub struct WriteConfig {
    /// The resource type string (see `fusion::node::NodeType`)
    pub resource_type: String,
    /// Absolute target/run path for this node.
    pub run_file_path: PathBuf,
}

impl Object for WriteConfig {
    fn call(
        self: &Arc<Self>,
        _state: &State<'_, '_>,
        args: &[MinijinjaValue],
        _listeners: &[Rc<dyn RenderingEventListener>],
    ) -> Result<MinijinjaValue, Error> {
        if args.is_empty() {
            return Err(Error::new(
                ErrorKind::InvalidOperation,
                "write function requires payload argument".to_string(),
            ));
        }

        // Extract payload from args
        let payload = match args[0].as_str() {
            Some(s) => s,
            None => {
                return Err(Error::new(
                    ErrorKind::InvalidOperation,
                    "Failed to convert payload to string".to_string(),
                ));
            }
        };

        // Write the file
        match write_file(&self.run_file_path, &self.resource_type, payload) {

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