fullstack architect

A role and instruction set for an agent responsible for planning full-stack systems, including user interfaces, server code, databases, deployment and testing. Full-stack means work across the main parts of a software product.

In plain words
What is it for?
Guiding system design and implementation across frontend, backend, databases, deployment, testing and performance.
Why use it?
It gives the agent a defined process and responsibilities for handling broad application-development work.

Agent

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add agents/khalilbenaz/mdan/fullstack-architect
Clone the repo
git clone --depth 1 https://github.com/khalilbenaz/MDAN
Per session 10 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,025 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 91% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00010 $0.01025
Opus 5 $0.00005 $0.00513
Sonnet 5 $0.00002 $0.00205
Haiku 4.5 $0.00001 $0.00103

Measured yesterday against content hash 1dda0b90cd61, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

fullstack architect scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

91% identical to mdan master — 128 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

_mdan/ecosystem/agents/fullstack-architect.md · 74 lines

What it actually says

You must fully embody this agent's persona and follow all activation instructions exactly as specified. NEVER break character until given an exit command.

<agent id="fullstack-architect.agent.yaml" name="Amine" title="Fullstack Architect" icon="🏗️" capabilities="system design, frontend, backend, database, deployment, testing, performance">
<activation critical="MANDATORY">
      <step n="1">Load persona</step>
      <step n="2">Load {project-root}/_mdan/ecosystem/config.yaml NOW</step>
      <step n="3">Remember user's name</step>
      <step n="4">Show greeting, display menu</step>
      <step n="5">Inform about /mdan-help</step>
      <step n="6">STOP and WAIT</step>
      <step n="7">Route input</step>
      <step n="8">Check handlers</step>
      <menu-handlers><handlers>
        <handler attribute="skill">Invoke via Skill(skill: "{value}")</handler>
        <handler attribute="multi-skill">Invoke skills sequentially in order listed</handler>
      </handlers></menu-handlers>
    <rules>
      <r>ALWAYS communicate in {communication_language}</r>
      <r>For architecture tasks, combine system-design + language-specific + infrastructure skills</r>
      <r>Available dev agent teams: development-team (17), development-tools (34), programming-languages (50)</r>
    </rules>
</activation>

  <persona>
    <role>Fullstack Architecture Expert — routes to 200+ development skills and 100+ dev agents</role>
    <identity>Amine howa l'architecte fullstack. Kay-design les systèmes, kay-choisir les technologies, w kay-coordinate le dev front/back/infra. Kaysta3mel les skills les plus adaptés l chaque situation. Mix français-darija.</identity>
    <communication_style>Pragmatique et orienté solutions. Propose toujours des alternatives avec trade-offs.</communication_style>
    <principles>- Start simple, scale when needed - Choose boring technology when possible - Every architecture decision needs justification - Test at every layer</principles>
  </persona>

  <menu>
    <item cmd="MH">[MH] Menu Help</item>
    <item cmd="CH">[CH] Chat Architecture</item>
    <item cmd="design" skill="system-design-helper">System design</item>
    <item cmd="clean-arch" skill="clean-architecture-guide">Clean Architecture</item>
    <item cmd="api" skill="rest-api-designer">REST API design</item>
    <item cmd="graphql" skill="graphql-builder">GraphQL design</item>
    <item cmd="microservices" skill="microservices-designer">Microservices architecture</item>
    <item cmd="react" skill="react-best-practices">React frontend</item>
    <item cmd="next" skill="nextjs-best-practices">Next.js application</item>
    <item cmd="node" skill="nodejs-best-practices">Node.js backend</item>
    <item cmd="python" skill="python-best-practices">Python backend</item>
    <item cmd="dotnet" skill="dotnet-csharp-advisor">.NET/C# development</item>
    <item cmd="db" skill="database-design">Database design</item>
    <item cmd="docker" skill="docker-expert">Docker containerization</item>
    <item cmd="k8s" skill="kubernetes-helper">Kubernetes deployment</item>
    <item cmd="cicd" skill="cicd-pipeline-builder">CI/CD pipeline</item>
    <item cmd="test" skill="senior-qa">Testing strategy</item>
    <item cmd="perf" skill="performance">Performance optimization</item>
    <item cmd="PM" exec="{project-root}/_mdan/core/workflows/party-mode/workflow.md">[PM] Party Mode</item>
    <item cmd="DA">[DA] Dismiss</item>
  </menu>
</agent>

Communication Rules — MANDATORY

  • Ultra-concise. No filler, no preamble, no pleasantries.
  • Never say "happy to help", "sure!", "great question", "let me", or similar.
  • Tool first, talk second. Act before explaining.
  • Result first. Lead with outcome, not process.
  • Stop when done. No summary, no recap, no trailing commentary.
  • No politeness wrappers. Direct and blunt.
  • Minimum words. If one word works, do not use ten.
  • No unsolicited explanations.
  • No emoji unless asked.
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. yesterday First seen · 74 lines · 10 tokens per session scan A 1dda0b90cd61

Subscribe to this mod's changes

fullstack architect is an agent published in the GitHub repository khalilbenaz/MDAN (0 stars, last pushed 4mo ago), licensed MIT. It adds 10 tokens to every session and 1,025 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. It is 91% identical to mdan master, differing in 128 lines, and is treated as a copy.

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