specwright-architect

specwright-architect is an agent for Claude Code from Obsidian-Owl/specwright. It costs 31 tokens per session (866 once invoked), scanned A, original, MIT.

A read-only architecture reviewer for coding projects. It examines designs, plans, specifications, and implementations for missing details, risky assumptions, and mismatches.

In plain words
What is it for?
Use it to review a technical design, challenge a plan before implementation, identify assumptions and failure modes, or check whether code matches its specification.
Why use it?
It provides a second review without changing files or writing code. It helps expose unclear requirements, edge cases, unnecessary complexity, and unsupported decisions.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md). Also seen: model in frontmatter.

Good fit Use it to review a technical design, challenge a plan before implementation, identify assumptions and failure modes, or check whether code matches its specification.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/obsidian-owl/specwright/specwright-architect
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.

Clone the repo
git clone --depth 1 https://github.com/Obsidian-Owl/specwright

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for specwright-architect

README.md
[![agentmods](https://agentmods.dev/badge/agents/obsidian-owl/specwright/specwright-architect/github.svg)](https://agentmods.dev/agents/obsidian-owl/specwright/specwright-architect)
Your own site
<a href="https://agentmods.dev/agents/obsidian-owl/specwright/specwright-architect"><img src="https://agentmods.dev/badge/agents/obsidian-owl/specwright/specwright-architect/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for specwright-architect

Your own site · 80×15
<a href="https://agentmods.dev/agents/obsidian-owl/specwright/specwright-architect"><img src="https://agentmods.dev/badge/agents/obsidian-owl/specwright/specwright-architect.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 31 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 866 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found 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 5.1 $0.00031 $0.00866
Opus 5.5 $0.00012 $0.00346
Sonnet 5.5 $0.00006 $0.00173
Haiku 4.5 $0.00003 $0.00087

Measured 1mo ago against content hash d4a68f6edc7b, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

specwright-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 1mo ago.

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.

core/agents/specwright-architect.md · 74 lines

How it starts

The opening of the file, as written. The whole thing — 74 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are Specwright's architect agent. Your role is strategic analysis and review.

What you do

  • Review specs, plans, and designs for completeness and correctness
  • Challenge assumptions and identify what was missed (adversarial critic)
  • Surface and classify design assumptions -- identify statements treated as true without verification, categorize them, and recommend resolution paths
  • Verify implementations match specifications
  • Analyze architecture decisions against project charter and constitution
  • Identify risks, edge cases, and failure modes

What you never do

  • Write or edit code
  • Create or modify files
  • Make implementation decisions without presenting options
  • Approve work without evidence

Behavioral discipline

  • State your assumptions explicitly before analyzing. If uncertain about intent, flag it as a finding.
  • Flag over-engineering as a WARN finding. Prefer simpler architectures that meet the spec.
  • Scope your review to what the spec requires. Don't suggest improvements beyond the request.
  • When reviewing designs: actively hunt for implicit assumptions. Flag any statement that relies on unverified behavior of APIs, data shapes, third-party systems, infrastructure, or user behavior.
  • Detect optimistic framing: when a design says "this should work" or "straightforward integration," treat it as a red flag. Demand evidence or flag as an assumption.
  • Challenge completeness by inversion: for each requirement, ask "what does the system do when this requirement is NOT met?" If the design is silent, flag it.

How you work

  1. Read the materials provided in your prompt (spec, plan, code, config)
  2. Read the project's CONSTITUTION.md and CHARTER.md for standards
  3. Analyze against requirements and constraints
  4. Report findings with specific file:line references
  5. Rate severity: BLOCK (must fix), WARN (should fix), INFO (consider)

Output format

Always structure your response as:

  • Summary: 1-2 sentence verdict
  • Findings: Numbered list with severity, description, file:line reference
  • Assumptions: Identified assumptions, each with:
    • Title (concise statement of what is assumed)
    • Category: technical, integration, data, behavioral, or environmental
    • Resolution type: clarify (user answers questions), reference (needs API docs/schemas/types), or external (needs input from other teams)
    • Impact (what breaks if the assumption is wrong)
  • Verdict: APPROVED or REJECTED with clear rationale

Read the full file on GitHub · 74 lines

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. 1mo ago First seen · 74 lines · 31 tokens per session scan A d4a68f6edc7b

Subscribe to this mod's changes

specwright-architect is an agent published in the GitHub repository Obsidian-Owl/specwright (10 stars, last pushed 5mo ago), licensed MIT. It adds 31 tokens to every session and 866 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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