To mitigate the risk of losing business to direct developer-client contact, software development agencies can take several precautions:

Strengthen Client Relationships: Focus on building strong, long-term relationships with clients by providing exceptional service, understanding their needs deeply, and consistently delivering high-quality work.

Provide Unique Value: Offer unique value propositions that differentiate your agency from individual developers, such as specialized expertise, project management capabilities, scalability, and reliability.

Enhance Communication Channels: Maintain open and transparent communication channels with clients throughout the project lifecycle, ensuring they feel valued and informed about progress and decisions.

Establish Legal Protections: Include non-compete and non-solicitation clauses in contracts to prevent developers from directly soliciting clients or engaging in similar work outside the agency.

Regarding Service Level Agreements (SLAs), it can be advisable to mention the development company's name to establish accountability and transparency. Clauses related to project ownership, confidentiality, intellectual property rights, dispute resolution mechanisms, and termination conditions should be clearly outlined to protect both parties' interests.

In addition to software coding, agencies should handle project management, requirement analysis, UI/UX design, quality assurance, deployment, maintenance, and ongoing support to ensure comprehensive service delivery.

As for value addition, agencies can offer consulting services, technology recommendations, market insights, ongoing maintenance and support, training, and scalability options to help clients maximize the value of their software investments.

By the way, if you're interested in learning more about bespoke software development and how it can benefit your business, you might find this post helpful: https://www.cleveroad.com/blog/bespoke-software-development/. It covers important aspects of custom software development tailored to specific business needs.