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    System Architect

    1

    Architect lean infrastructure by defining hosting, topology, backups, and secrets without cloud bloat.

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    System Architect

    System Architect

    Example session with this skill installed

    Read docs/architecture.md and define the infrastructure for 'TaskSync', a local-first desktop task manager. Hosting is local-first. Output to docs/infrastructure.md.

    • Read your context and instructions
    • Compiled the system architect

    I have analyzed the TaskSync architecture and non-functional requirements. The infrastructure handoff has been generated at docs/infrastructure.md with a status of ready.

    docs/infrastructure.md

    FieldValue
    product_nameTaskSync
    slice_goalEstablish local-first persistence and process topology
    has_uiyes
    hostinglocal-first
    statusready

    Decision
    Local-first. The NFR requires "no network" and "zero-latency local storage," which dictates a standalone process with no external cloud dependencies.

    Topology

    • Processes: One Electron-based desktop process owning the UI and local DB lifecycle.
    • Listeners: none. No HTTP or REST ports are exposed.
    • Storage: data/tasks.db (SQLite) located relative to the application data directory.

    Backups

    • What: data/tasks.db

    Where: Operator-triggered copy to a user-defined external directory or cloud-synced folder (e.g., Dropbox/OneDrive).

    • Restore: Manual replacement of the SQLite file from the backup copy.

    Secrets
    none. The current slice has no identity requirements or external API integrations.

    Deploy
    Run the packaged executable on the desk machine. Packaging and installer creation are deferred to a later slice.

    Observability
    Local log file written to logs/app.log. No external telemetry.

    Cost
    $0 monthly infrastructure.

    Failure modes

    • Disk full: SQLite write failure. Recovery: Notify user to clear space.
    • Missing data file: Process start failure. Recovery: Initialize new empty database.

    Will-not-build

    • No Docker containers.
    • No REST API or localhost listener.
    • No managed database or cloud object storage.

    Residual

    • implemented: no
    • devops: skipped (no CI needed for local-only binary this slice)

    Next steps

    1. Review the docs/infrastructure.md for topology alignment.
    2. Initialize the data/ and logs/ directories in the project root.
    3. Move to the senior-planner skill to sequence implementation tasks.

    Connects securely to your tools. The creator never sees your data.

    About this skill

    The problem

    Infrastructure planning often devolves into cloud shopping sprees, over-engineering local apps with unnecessary clusters, and stalling projects with vague hosting decisions.

    What it does

    • Evaluates software architecture and non-functional requirements to define a concrete hosting shape.
    • Specifies process topology, storage paths, and listener ports while strictly avoiding unnecessary networking for local-first apps.
    • Outlines durable backup procedures and secret management without introducing external SaaS dependencies.
    • Produces a standardized docs/infrastructure.md contract that dictates deployment strategy without writing implementation code.

    Why this beats prompting it yourself

    This skill prevents the common AI tendency to suggest a "fleet of clouds" for a simple desktop app. It enforces a strict "no server" policy where appropriate, ensuring your infrastructure remains as lean as your P0 requirements. It acts as a gatekeeper, blocking the workflow if hosting decisions or architectural prerequisites are missing rather than guessing.

    Use cases

    • Defining infrastructure for a local-first desktop application using SQLite.
    • Mapping out the minimal hosted topology for a P0 web service MVP.
    • Establishing backup and secret management protocols for a single-operator tool.
    • Generating infrastructure handoffs for automated developer workflows.

    Known limitations

    This skill produces documentation only. It does not author Dockerfiles, Terraform scripts, or application code. It requires an existing architecture document to function.

    How to use

    Skills on Agensi run inside your AI agent. Copy the prompt, paste it into your agent, and it connects to Agensi and installs this skill for you. If a payment is needed, your agent shows it to you first.

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