dagger/dagger · error

attach bound workspace: %w

Error message

attach bound workspace: %w

What it means

During AttachDependencyResults for a module function call context, Dagger tried to attach the module's bound workspace and the underlying attach() call returned an error. The bound workspace object could not be re-attached to the current dagql server, so dependent results cannot be wired into the running function call. The root cause is wrapped in %w and typically comes from resolving/attaching the Workspace object.

Source

Thrown at core/current_module_as_sdk.go:198

	}
	return c, nil
}

// AttachDependencyResults attaches the bound workspace so it becomes cache-backed
// and its result ID resolves when the client is persisted (EncodePersistedObject)
// and reloaded.
func (c *CurrentModuleAsSDKClient) AttachDependencyResults(
	ctx context.Context,
	_ dagql.AnyResult,
	attach func(dagql.AnyResult) (dagql.AnyResult, error),
) ([]dagql.AnyResult, error) {
	_ = ctx
	if c == nil || c.BoundWorkspace.Self() == nil {
		return nil, nil
	}
	attached, err := attach(c.BoundWorkspace)
	if err != nil {
		return nil, fmt.Errorf("attach bound workspace: %w", err)
	}
	typed, ok := attached.(dagql.ObjectResult[*Workspace])
	if !ok {
		return nil, fmt.Errorf("attach bound workspace: unexpected result %T", attached)
	}
	c.BoundWorkspace = typed
	return []dagql.AnyResult{typed}, nil
}

View on GitHub (pinned to 82ba2681db)

Solutions

1. Regenerate/rebuild the module and rerun with a fresh session to eliminate stale workspace IDs
2. Inspect the wrapped root error for the actual attach failure and address it (usually object resolution)
3. Update Dagger CLI and module SDK to matching versions
4. File a Dagger issue with the wrapped error and module repro if it persists on a fresh session

// Go module runtime
deps, err := callCtx.AttachDependencyResults(ctx)
if err != nil {
    if strings.Contains(err.Error(), "attach bound workspace") {
        return nil, fmt.Errorf("workspace could not be re-attached; rerun in a fresh session: %w", err)
    }
    return nil, err
}

When it happens

Trigger: Calling a module function whose call context (CurrentModuleCallContext) has BoundWorkspace set, when attach(c.BoundWorkspace) fails — e.g. the workspace object reference cannot be resolved against the current dagql server (stale ID, wrong server instance, deleted object).

Common situations: Module SDK plumbing: a module function invoked with dependency results where the workspace was created in a prior/foreign session; IDs decoded against a different engine; internal regressions in the module runtime.

Related errors

• attach bound workspace: unexpected result %T
• attach llm workspace: %w
• bind workspace module tools: %w
• attach module source: %w
• attach module context source: %w

AI-assisted analysis of dagger/dagger@82ba2681db (2026-09-05). Data as JSON: /api/errors/bf03e08fa5ddb913. Report an issue: GitHub.