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    Technical Spec Writer

    Technical Spec Writer

    by Arnstein Larsen

    Write a technical spec that lets reviewers find the flaw before the code does — with data models, edge cases, and failure modes explicit.

    Updated Jun 2026
    Security scanned

    $9.99

    · or 50 credits

    30-day refund guarantee

    Secure checkout via Stripe

    Included in download

    • Draft rigorous RFCs and design documents
    • Identify edge cases and failure modes in system designs
    • Instant install

    Sample input

    Write a technical spec for adding a rate-limiting layer to our Node.js API using Redis. Our stack is AWS, and we handle 5k requests per second.

    Sample output

    Tech Spec: Redis Rate-Limiting

    Failure Modes

    • Redis Latency: If Redis times out, we fail open to ensure availability.
    • Memory Exhaustion: LRU policy details included.

    Data Model

    • Key: rate:v1: {userId}:{window}
    • TTL: 60s

    Rollout

    • Phase 1: Shadow mode logging.

    About This Skill

    A technical spec has one job: let reviewers find the flaw before the code does. Most specs fail this job because they describe the happy path in detail and gesture vaguely at 'error handling' — reviewers can't find what isn't written. This skill writes specs that make the hard parts explicit: the data model and why it's shaped this way rather than another, the state machine for anything with multiple states, the failure modes and what the system does in each, the security surface and how it's protected, the performance assumptions and what breaks them, and the open questions that could invalidate the design. It follows the structure reviewers expect so they can get to the substance faster. Describe your feature and technical context; get back a spec your team can review, not just approve.

    Use Cases

    • Draft rigorous RFCs and design documents
    • Identify edge cases and failure modes in system designs
    • Document data models and migration safety plans
    • Compare technical alternatives with honest trade-offs

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    Passed automated security review

    Permissions

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    Compatible with SKILL.md-compatible agents including Claude Code and Cursor.

    Frequently Asked Questions

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