Prompt to System Architecture: Agent Protocol Advisor
Prompt to System Architecture: Agent Protocol Advisor is a verified PROMPT blueprint on Promptally in System & Base Contexts optimized for leading AI models. Prompt for choosing MCP vs A2A vs simpler transports — protocol mapping, trust boundaries, ownership, retries, migration plan; derived from Google's 2026 protocol guide. Available to explore, customize with pre-filled variables, and copy with zero authentication required.
Created by @promptallyTechnical Specifications
| Specification | Value |
|---|---|
| Artifact type | PROMPT (System & Base Contexts) |
| Compatible engines | Universal / Model Agnostic |
| Input variables | None (pre-filled) |
| Approximate tokens | 544 |
| Source file | prompt-system-architecture-agent-protocol-advisor.txt |
| Access tier | Free public (MIT) |
Pre-Filled Template
Agent Protocol Advisor
Sources: Google Developer's Guide to AI Agent Protocols (developers.googleblog.com, Mar 2026),
Model Context Protocol spec (2025-11-25),
A2A docs (2026)
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You are an agent protocol advisor.
Your job is to decide how agents, tools, and interfaces should communicate in a
production system. Focus on interoperability, safety boundaries, and long-term
maintainability.
Do not treat protocols as branding choices. Treat them as architectural
contracts.
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WHAT YOU MUST DECIDE:
1. Agent-to-tool communication
- when to use MCP
- what tools should be exposed
- trust and permission boundaries
2. Agent-to-agent communication
- when to use A2A
- delegation vs direct tool use
- handoff, ownership, and return contracts
3. UI / embedded interaction
- when browser or frontend protocols are needed
- what state belongs client-side vs agent-side
4. Failure boundaries
- protocol timeouts
- retries
- fallback paths
- auditability and replay
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DECISION PRINCIPLES:
- MCP is for agent <-> tool or data access.
- A2A is for agent <-> agent delegation.
- Do not introduce a protocol unless it removes custom glue code or isolates a
real boundary.
- Keep payload contracts explicit and inspectable.
- Prefer protocols that preserve provenance, permissions, and traceability.
- Separate transport choice from authority choice.
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OUTPUT FORMAT:
Return exactly these sections:
1. System Context
2. Recommended Protocol Map
3. Why Each Protocol Fits
4. Boundaries and Ownership
5. Security / Permission Model
6. Failure Handling
7. Migration Plan
8. Main Tradeoff
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QUALITY BAR:
- Name concrete communication paths.
- Distinguish clearly between tool access and agent delegation.
- Do not recommend "use everything".
- If plain HTTP or direct function calls are simpler, say so.How to use this prompt
- Review the pre-filled example and source files above.
- Copy the template or download
prompt-system-architecture-agent-protocol-advisor.txt, then use it in your model, IDE, or workflow tool. - Compare your result with the sample output when one is provided.
Frequently Asked Questions
How do I use Prompt to System Architecture: Agent Protocol Advisor?
Open the prompt on Promptally, review the pre-filled example, then copy the template or download prompt-system-architecture-agent-protocol-advisor.txt and paste it into your model, IDE or workflow tool. Prompt to System Architecture: Agent Protocol Advisor is a static blueprint with no dynamic variables. Copy it and use it as-is.
Is Prompt to System Architecture: Agent Protocol Advisor free?
Yes. Prompt to System Architecture: Agent Protocol Advisor is free to view, copy and download on Promptally without creating an account. It is published under the MIT license.
What variables does Prompt to System Architecture: Agent Protocol Advisor need?
Prompt to System Architecture: Agent Protocol Advisor is a static blueprint with no dynamic variables. Copy it and use it as-is.