What is senior-architect?

A software-architecture guide for planning how an application is structured, how its parts depend on one another, and which database or service approach to choose.

Use it to design system architecture, compare microservices with a monolith, create architecture diagrams, analyze dependencies, or choose a database.

It helps developers compare major design choices before implementation creates costly changes.

senior-architect — Skill for Claude Code and Codex by johnefemer

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.

Any agent

npx skills add johnefemer/skillfish --skill senior-architect

Clone the repo

git clone --depth 1 https://github.com/johnefemer/skillfish

Made for: Claude Code, Codex.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/johnefemer/skillfish/senior-architect/github.svg)](https://agentmods.dev/skills/johnefemer/skillfish/senior-architect)

Your own site

<a href="https://agentmods.dev/skills/johnefemer/skillfish/senior-architect"><img src="https://agentmods.dev/badge/skills/johnefemer/skillfish/senior-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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/johnefemer/skillfish/senior-architect"><img src="https://agentmods.dev/badge/skills/johnefemer/skillfish/senior-architect.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 43 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,330 The whole file, excluding the scripts and references it only reads on demand.

Security scan B 1 finding. A grade says what 26 rules found in the file — not that it is safe.

Origin unknown 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.

Model	Per session	Once invoked
Fable 5.1	$0.00043	$0.02330
Opus 5.5	$0.00017	$0.00932
Sonnet 5.5	$0.00009	$0.00466
Haiku 4.5	$0.00004	$0.00233

Measured 2mo ago against content hash e2f53c35e3d9, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

senior-architect scanned grade B with 1 finding 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 2mo ago.

The scan reads SKILL.md. This mod also ships 3 executable files (scripts/architecture_diagram_generator.py, scripts/dependency_analyzer.py, scripts/project_architect.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

Unrestricted tool accessmediumExcessive agency

A wildcard tool grant or "run any command" leaves no least-privilege boundary at all.

1. Run any script with `--help` for usage information

skills/senior-architect/SKILL.md · 344 lines

The source is not reproduced here

No licence file

Read it on GitHub

Files

What ships with it

6 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

2mo ago First seen · 344 lines · 43 tokens per session scan B e2f53c35e3d9

Subscribe to this mod's changes

senior-architect is a skill published in the GitHub repository johnefemer/skillfish (4 stars, last pushed 4d ago), with no licence file. It adds 43 tokens to every session and 2,330 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it B with 1 finding (unrestricted tool access). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

Backend and APIs Planning

senior-architect next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
senior-architectjohnefemer/skillfish	Skill	4	4d ago	none	B	43	Claude Code, Codex
mem0-oss-to-platformmem0ai/mem0	Skill	69k	today	Apache-2.0	A	217	Claude Code, Codex
azure-mgmt-botservice-dotnetmicrosoft/skills	Skill	3.2k	yesterday	MIT	A	78	Claude Code
fastapi-router-pymicrosoft/skills	Skill	3.2k	yesterday	MIT	A	46	Claude Code
dev-runtimelangwatch/langwatch	Skill	5.0k	yesterday	Apache-2.0	A	172	Claude Code
api-designericrisco/rsc-harness	Skill	503	2d ago	MIT	A	105	Claude Code, Codex
migrate-segw-to-raparc-mcp/arc-1	Skill	252	yesterday	MIT	A	106	Claude Code

senior-architect

Getting it into your agent

Wrote this? Show the measurements

What it costs to keep this loaded

Grade B, and why

Unrestricted tool accessmediumExcessive agency

The source is not reproduced here

No licence file

What ships with it

What this file has done since we first saw it

senior-architect compared with skills from other repositories