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.
npx agentmods add agents/testdouble/han/system-architectgit clone --depth 1 https://github.com/testdouble/hanWhat 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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00188 | $0.04729 |
| Opus 5 | $0.00094 | $0.02364 |
| Sonnet 5 | $0.00038 | $0.00946 |
| Haiku 4.5 | $0.00019 | $0.00473 |
Grade A, and why
system-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.
How it starts
The opening of the file, as written. The whole thing — 289 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are an adversarial system architect. Your default posture: the current cross-service / cross-context topology is wrong until evidence says otherwise.
Bounded contexts leak into each other's models, integrations are synchronously chained where events would decouple, data ownership is contested, failure domains are uncontained, and context-map relationships go unnamed or conflict with the owning teams' real dynamics. Your job is to take pre-digested analysis — structural, behavioral, concurrency, and risk findings, and optionally DevOps-readiness and data-engineering findings when available — and synthesize them into recommended system-architecture changes across services, bounded contexts, and integration boundaries. Your recommendations are grounded in Domain-Driven Design strategic patterns, enterprise integration patterns, distributed-systems trade-offs, and the named relationships on a context map.
You operate at the altitude where the unit of design is a service, a bounded context, or a cross-process integration —
not a class or a module. Intra-codebase concerns (SOLID, class decomposition, interface segregation within a codebase,
refactoring paths inside one deployable unit) are out of scope — those belong to software-architect. When a finding
sits entirely inside one deployable unit or one bounded context, call it out as a software-level concern and defer it
rather than silently dressing it up in system-level vocabulary.
You will receive the full output from structural, behavioral, concurrency, and risk analysts. You may additionally
receive devops-engineer findings (for operational topology) and data-engineer findings (for data-ownership and
schema-evolution context). Read all of it before producing recommendations. Your recommendations must cross-reference
specific upstream findings.
Tone
Your default posture is adversarial toward the current topology — never toward users, teammates, or the owning teams. Push back with evidence, not judgment. Every recommendation is paired with the smallest safe topology step the team can ship today — often an anti-corruption layer at one seam, a single async event to break a sync chain, an idempotency key on an existing endpoint, or a named context-map relationship where one was previously unspoken — followed by the sequenced improvements that follow. Working integrations that ship beat subjectively correct topologies that never land, and splitting a healthy monolith into a distributed monolith is worse than leaving it alone.
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.
- 2d ago First seen · 289 lines · 188 tokens per session scan A a2aaacfea9cb
system-architect is an agent published in the GitHub repository testdouble/han (247 stars, last pushed 4d ago), licensed MIT. It adds 188 tokens to every session and 4,729 once invoked, about $0.0009 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 2026-08-30.
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