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SPEC-DRIVEN DEVELOPMENTOPEN BETA — 2026

CLARITYPRECEDES CODE.

An AI Senior Architect that uncovers edge cases and drafts the 4-file spec bundle your AI coding agents build from.

OPEN BETA CLOSES IN
00D
00H
00M
00S
  • constitution.md
  • requirements.md
  • solution.md
  • tasks.md
FIG. 00 — THE BUNDLELIVE 3D
DRAG TO ROTATE
SCROLL — 4 SHEETS BELOW
01 / WHAT

The spec engine.

messy idea → structured interview → four sharp files

A — THE MESSauth + billingscope: ??mobile latership friday!!
B — THE INTERVIEW
?
ASKS LIKE A SENIOR ARCHITECT
C — THE BUNDLE
constitution.md
requirements.md
solution.md
tasks.md
HOVER → EXPLODE VIEW

TAP A FILE — INSPECT THE SHEET

requirements.mdMYSPEC BUNDLE

WHAT WE BUILD

user stories92%
acceptance criteria88%
edge cases64%
every criterion testableDIFF CLEAN
02 / WHY SDD // SPEC VS PROMPT BATTLE

PROMPT DRIVEN IS BROKEN. SPEC DRIVEN IS DETERMINISTIC.

See what happens when you replace vague chat prompts with immutable 4-file architectural contracts.

REWORK REDUCTION
0%fewer regression bugs
NET SHIP VELOCITY
0×faster end-to-end delivery
REQUIREMENT TRACEABILITY
0%testable spec coverage
40+ Chat Turns vs Single Spec Bundle
PROMPT-DRIVENDECAYING CONTEXT
Context Retention15%
> "Wait, did you remember guest checkout shouldn't require an account?"
Agent: "Apologies! Rewriting auth logic again..."

⚠️ Agents forget non-goals after 12 turns, invent non-existent APIs, and overwrite architecture.

SPEC-DRIVEN (SDD)IMMUTABLE CONTRACT
Deterministic Context100%
// constitution.md (Locked Invariant)
[INV-02] Guest checkout MUST NEVER require account creation.
// MCP Server streams constraint directly into Cursor.

Rules remain immutable across all agent prompts. Zero context degradation.

03 / HOW

Four moves. Zero meetings about meetings.

FIG. 03.1The interview
myspec — architect interview
AIwhat must v1 absolutely do?
YOUauth, billing, one dashboard
AIwho is explicitly out of scope?
YOUmobile app — later
AIdrafting requirements.md with EARS+ syntax …
FIG. 03.2The bundle
constitution.md3 rules
requirements.md21 criteria
solution.md6 diagrams
tasks.md18 tasks
FIG. 03.3The refine
requirements.mdv1.3 → v1.4
·WHEN the user upgrades plan
THEN notify via email
+THEN notify via email AND webhook event
·ACCEPTANCE: stripe webhook response == 200
VERSIONED

EDIT IN PLAIN ENGLISH — EVERY CHANGE LANDS WITH AN AUDITABLE DIFF

FIG. 03.4The handoff
BUNDLE.ZIP4 FILES · READY
CURSOR
CLAUDE CODE
WINDSURF
BOLT
REPLIT
VIA MCP ⚡
04 / WHEN

Before the code. Every single time.

five critical moments where the 4-file bundle earns its keep

  1. DAY 0

    KICKOFF

    Pin the north star principles before hallucinations start.

  2. DAY 3

    SCOPE CHECK

    Stop scope creep: constitution.md holds the line against bloat.

  3. WK 2

    HANDOFF

    Cursor, Claude Code, and Windsurf start from clear specs — not chat threads.

  4. WK 6

    BROWNFIELD

    Interview legacy codebases into clean, scoped PR proposals.

  5. AUDIT

    DRIFT CHECK

    Diff code against the 4-file bundle contract in one click.

NOW SPECIFICATION BEFORE CODE
04 / ROADMAP // EXECUTION SPINE

WHERE WE ARE. WHERE WE'RE GOING.

Click any quarter along the timeline. Shipped items are delivered; in-progress features are active in Open Beta.

Q3 2026 // IN PROGRESS

Brownfield & Team Collaboration (Current)

MILESTONE COMPLETION80%
DELIVERABLES & TARGETS
  • Open Beta Public Cohort (Live Today)
  • Brownfield reverse-engineering from existing repos
  • Multi-developer collaborative spec workspaces
  • VS Code Official Marketplace extension
  • Automated CI PR spec compliance gate
06 / BETA ACCESS // UNLIMITED VALUE

100% FREE IN OPEN BETA.

All tiers and AI Senior Architect capabilities are currently unlocked and free for early builders. Claim your unlimited access before public rollout.

OPEN BETA COHORT IS LIVE — NO CREDIT CARD REQUIRED
UNLIMITED AI THROUGHPUT & SPECS FOR ALL EARLY ADOPTERS
IndividualSOLO DEVELOPERS
FREE FOREVER
Full capabilities unlocked with zero restrictions
AI ARCHITECT CAPACITYSTANDARD CAPACITY
  • Unlimited projects & specs
  • Standard MCP context streaming
  • 4-file bundle compiler engine
  • Markdown + Mermaid export
  • Community GitHub support
MOST POPULAR // UNLOCKED FREE
Senior ArchitectFULL POWER // OPEN BETA PASS
100% FREE IN BETA
Full capabilities unlocked with zero restrictions
AI ARCHITECT CAPACITY5× THROUGHPUT
  • Everything in Individual
  • 5× AI Senior Architect throughput
  • Direct Cursor & Claude Code streaming
  • Brownfield codebase reverse-engineering
  • EARS+ automated requirement validation
  • Priority architect support
Team & EnterpriseFOR FAST-MOVING SQUADS
FREE FOR TEAMS IN BETA
Full capabilities unlocked with zero restrictions
AI ARCHITECT CAPACITY10× THROUGHPUT
  • Everything in Senior Architect
  • 10× AI throughput per developer seat
  • Shared cross-repo constitution
  • Multi-developer spec collaboration
  • Custom company architecture templates
  • Automated CI PR compliance gates
EARLY ADOPTERS RETAIN FREE SPECS & MARKDOWN ASSETS FOREVERNO LOCK-IN · EXPORT FULL BUNDLE ZIP ANYTIME
05 / PROOF OF CLARITY // ARCHITECT REVIEWS

BEYOND EXPECTATIONS.

Leading software architects, engineering leads, and technical founders who refuse to let AI code without a blueprint.

SPECS COMPILED1,420+
REWORK REDUCTION−62%
HALLUCINATIONS0.0%
ARCHITECT RATING4.95 / 5
EARS+ VERIFIEDVERIFIED ARCHITECT

MySpec turned our chaotic prompt iterations into deterministic 4-file architectural contracts. Cursor and Claude Code follow every constraint without going off the rails.

Alex Rivera

Alex Rivera

Staff Architect at Hyperion Systems

ZERO DRIFTVERIFIED ARCHITECT

We value tools that feel stable, well thought out, and aligned with the standards we expect across our stack. MySpec lets our team ship with confidence rather than fixing unstated assumption bugs in production.

Elena Rostova🌀

Elena Rostova

VP of Engineering at Vortex Cloud

−65% PR TIMEVERIFIED ARCHITECT

The senior architect interview catches edge cases before a single line of code is written. Our PR review time dropped by 65% because pull requests cite exact requirement IDs.

Marcus Vance💠

Marcus Vance

Lead Systems Architect at Synthetix Labs

TOKEN OPTIMIZEDVERIFIED ARCHITECT

Spec-driven development with MySpec has been a game-changer. It makes sure our AI coding agents build deterministic software without burning tokens on circular hallucination loops.

Chloe Dubois🔷

Chloe Dubois

Principal Engineer at Axiom Runtime

SINGLE SOURCEVERIFIED ARCHITECT

Having our non-negotiables in constitution.md and acceptance criteria in EARS+ format gave our distributed team a single source of truth that humans and AI agents share.

Tariq Al-Mansoor🚀

Tariq Al-Mansoor

Founder at Kinetics Data

MCP STREAMINGVERIFIED ARCHITECT

The @myspec/mcp-server integration is seamless. We write specs in our browser, export to Git, and our IDE agents immediately pull structured context via stdio.

Julian Sterling💎

Julian Sterling

Senior AI Lead at Prism Protocol

EARS+ VERIFIEDVERIFIED ARCHITECT

MySpec turned our chaotic prompt iterations into deterministic 4-file architectural contracts. Cursor and Claude Code follow every constraint without going off the rails.

Alex Rivera

Alex Rivera

Staff Architect at Hyperion Systems

ZERO DRIFTVERIFIED ARCHITECT

We value tools that feel stable, well thought out, and aligned with the standards we expect across our stack. MySpec lets our team ship with confidence rather than fixing unstated assumption bugs in production.

Elena Rostova🌀

Elena Rostova

VP of Engineering at Vortex Cloud

−65% PR TIMEVERIFIED ARCHITECT

The senior architect interview catches edge cases before a single line of code is written. Our PR review time dropped by 65% because pull requests cite exact requirement IDs.

Marcus Vance💠

Marcus Vance

Lead Systems Architect at Synthetix Labs

TOKEN OPTIMIZEDVERIFIED ARCHITECT

Spec-driven development with MySpec has been a game-changer. It makes sure our AI coding agents build deterministic software without burning tokens on circular hallucination loops.

Chloe Dubois🔷

Chloe Dubois

Principal Engineer at Axiom Runtime

SINGLE SOURCEVERIFIED ARCHITECT

Having our non-negotiables in constitution.md and acceptance criteria in EARS+ format gave our distributed team a single source of truth that humans and AI agents share.

Tariq Al-Mansoor🚀

Tariq Al-Mansoor

Founder at Kinetics Data

MCP STREAMINGVERIFIED ARCHITECT

The @myspec/mcp-server integration is seamless. We write specs in our browser, export to Git, and our IDE agents immediately pull structured context via stdio.

Julian Sterling💎

Julian Sterling

Senior AI Lead at Prism Protocol

FEATURED ACROSS THE AI DEVELOPER ECOSYSTEM