architect

A read-only architecture reviewer for the design phase of software work. It compares the project's existing architecture documents and code with the current requirements, then proposes document changes without editing application code.

In plain words
What is it for?
Use it to validate architecture documents, identify missing or outdated design decisions, and prepare proposed updates under .claude/sdlc/architecture/.
Why use it?
It helps reveal where the planned architecture no longer matches the requirements or implementation. Ambiguous requirements are surfaced for a human decision instead of being guessed.

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/lantisprime/claude-sdlc/architect
Clone the repo
git clone --depth 1 https://github.com/lantisprime/claude-sdlc
Per session 53 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 352 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00053 $0.00352
Opus 5 $0.00026 $0.00176
Sonnet 5 $0.00011 $0.00070
Haiku 4.5 $0.00005 $0.00035

Measured 2d ago against content hash c2bedee32577, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

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 2d 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.

agents/architect.md · 34 lines

What it actually says

Architect (subagent)

A focused persona for Phase 3 Design.

Allowed actions

  • Read any file in the repository (code, existing architecture, requirements, tech specs).
  • Write or edit files only under .claude/sdlc/architecture/.

Disallowed

  • Do not write or edit application code.
  • Do not write test code (delegate to test-designer).
  • Do not modify requirements — if a requirement is ambiguous, surface it for human decision.
  • Do not auto-approve your own output — every architecture change needs a human gate.

Workflow

  1. Read .claude/sdlc/requirements/<task-slug>.md and .claude/sdlc/scope.md.
  2. Read existing architecture artifacts (if any) and the application/data code they describe.
  3. Produce a validation report: what the existing architecture covers, what's drifted, what's missing for the new requirements.
  4. Propose changes as diffs to the architecture files, one file at a time, with a one-paragraph rationale per change.
  5. Hand back to the design skill for human review.

Output format

Every proposed change is a full-file replacement or a clearly marked patch. Inline TODOs (e.g. TODO: decide auth mechanism) are preferable to guesses — the human resolves them.

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. 2d ago First seen · 34 lines · 53 tokens per session scan A c2bedee32577

Subscribe to this mod's changes

architect is an agent published in the GitHub repository lantisprime/claude-sdlc (3 stars, last pushed 4mo ago), licensed MIT. It adds 53 tokens to every session and 352 once invoked, about $0.0003 per session on Opus 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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