warpdotdev/warp · error · anyhow::Error

--subject-template requires at least one value

Error message

--subject-template requires at least one value

What it means

Error "--subject-template requires at least one value" thrown in warpdotdev/warp.

Source

Thrown at app/src/ai/agent_sdk/federate.rs:43

    match command {
        FederateCommand::IssueToken(args) => issue_token(ctx, args, global_options.output_format),
        FederateCommand::IssueGcpToken(args) => issue_gcp_token(ctx, args),
    }
}

fn issue_token(
    ctx: &mut AppContext,
    args: IssueTokenArgs,
    output_format: OutputFormat,
) -> Result<()> {
    // Set the task ID so the ambient agent workload token header is sent.
    set_ambient_task_context_from_run_id(ctx, &args.run_id)?;

    let duration: std::time::Duration = args.duration.into();
    let audience = args.audience;
    let subject_template = match args.subject_template {
        Some(template) => vec1::Vec1::try_from_vec(template)
            .map_err(|_| anyhow::anyhow!("--subject-template requires at least one value"))?,
        None => vec1::vec1!["principal".to_owned()],
    };

    ManagedSecretManager::handle(ctx).update(ctx, move |manager, ctx| {
        let future =
            manager.issue_task_identity_token(warp_managed_secrets::client::IdentityTokenOptions {
                audience,
                requested_duration: duration,
                subject_template,
            });
        ctx.spawn(future, move |_, result, ctx| match result {
            Ok(token) => {
                let token_value = token.token;
                let expires_at = token.expires_at.to_rfc3339();
                let issuer = token.issuer;
                match output_format {
                    OutputFormat::Json | OutputFormat::Ndjson => {
                        let output = json!({

View on GitHub (pinned to e72fd7aacb)

When it happens

Trigger: Thrown at app/src/ai/agent_sdk/federate.rs:43 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of warpdotdev/warp@e72fd7aacb (2026-08-16). Data as JSON: /api/errors/6c46396f09244acf. Report an issue: GitHub.