How to reproduce: At shell:

# zf create project foo
Creating project at /path/foo

# cd /path/foo
# zf show project.info
Working with project located at: /path/foo

# zf create project-provider foo doit
Creating a project provider named foo in location /path/foo/providers/FooProvider.php
Updating project profile '/path/foo/.zfproject.xml'


# zf doit foo
                       An Error Has Occurred
 Action 'doit' is not a valid action.

Expected: 'no error' (and no real output because the provider action has not been implemented)

Why is that? Why docs does not cover creating project-specific providers?

Let's query available actions of "foo" provider:

# zf ? foo
                       An Error Has Occurred
 Provider 'foo' is not a valid provider.

Expected:

Zend Framework Command Line Console Tool v1.9.2
Actions supported by provider "Foo"
  Foo
    zf doit foo

The xml looks ok. It contains:

[...]
    
[...]

Inside /path/foo/providers/FooProvider.php we have:

<?php

require_once 'Zend/Tool/Project/Provider/Abstract.php';
require_once 'Zend/Tool/Project/Provider/Exception.php';

class FooProvider extends Zend_Tool_Project_Provider_Abstract
{

    public function doit()
    {
        /** @todo Implementation */
    }


}

Looks clear to me... yet - it doesn't work!