contract/agreement_mrp/views/agreement_view.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>

    <record model="ir.actions.act_window" id="action_mrp_production_agreement_specific">
        <field name="name">Manufacture Orders</field>
        <field name="type">ir.actions.act_window</field>
        <field name="res_model">mrp.production</field>
        <field name="view_type">form</field>
        <field name="view_mode">tree,form</field>
        <field name="domain">[('agreement_id', '=', active_id)]</field>
        <field name="help" type="html">
          <p class="oe_view_nocontent_create">
            Create MOs
            </p>
        </field>
    </record>

    <record id="partner_agreement_form_view" model="ir.ui.view">
        <field name="name">agreement.form.mrp</field>
        <field name="model">agreement</field>
        <field name="inherit_id" ref="agreement.partner_agreement_form_view"/>
        <field name="arch" type="xml">
            <xpath expr="//div[@name='button_box']" position="inside">
                <button name="%(action_mrp_production_agreement_specific)d" type="action" attrs="{'invisible': [('mo_count', '=', 0)]}" class="oe_stat_button" icon="fa-wrench">
                    <div class="o_field_widget o_stat_info">
                        <span class="o_stat_value"><field name="mo_count" widget="statinfo" nolabel="1"/></span>
                        <span class="o_stat_text">MOs</span>
                    </div>
                </button>
            </xpath>
        </field>
    </record>

</odoo>