pith-arch

pith-arch is a skill for Claude Code from abhisekjha/pith. It costs 40 tokens per session (437 once invoked), scanned A, original, MIT.

A one-shot format for recording an architecture decision, including the options considered, the chosen option, risks, and next action.

In plain words
What is it for?
Use it when choosing tools, data storage, interfaces, or other system designs that need a concise decision record.
Why use it?
It makes technology and system-design choices easier to compare, explain, and act on.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the pith plugin — 12 skills, 4 commands, 4 hooks shipped together

Good fit Use it when choosing tools, data storage, interfaces, or other system designs that need a concise decision record.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/abhisekjha/pith/pith-arch
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 abhisekjha/pith --skill pith-arch
Clone the repo
git clone --depth 1 https://github.com/abhisekjha/pith

Made for: Claude Code.

Or install pith, the plugin that ships this one along with the rest of its 12 skills, 4 commands, 4 hooks.

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 pith-arch

README.md
[![agentmods](https://agentmods.dev/badge/skills/abhisekjha/pith/pith-arch/github.svg)](https://agentmods.dev/skills/abhisekjha/pith/pith-arch)
Your own site
<a href="https://agentmods.dev/skills/abhisekjha/pith/pith-arch"><img src="https://agentmods.dev/badge/skills/abhisekjha/pith/pith-arch/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 pith-arch

Your own site · 80×15
<a href="https://agentmods.dev/skills/abhisekjha/pith/pith-arch"><img src="https://agentmods.dev/badge/skills/abhisekjha/pith/pith-arch.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 40 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 437 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 $0.00040 $0.00437
Opus 5 $0.00020 $0.00218
Sonnet 5 $0.00008 $0.00087
Haiku 4.5 $0.00004 $0.00044

Measured 9d ago against content hash 2a1083a8cc04, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

pith-arch 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 9d 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.

skills/pith-arch/SKILL.md · 54 lines

What it actually says

Architecture decision format. Structured. No narrative.

Decision: [what is being decided — one line]

Option Pro Con Complexity
A ... ... low/med/high
B ... ... low/med/high
C ... ... low/med/high

Choice: [option name] — [single sentence reason]

Risks:

  • [risk]
  • [risk]

Next: [immediate first action]

Rules

  • Table rows: 2–5 options. If more, group similar ones.
  • Pro/Con: one phrase each. Not full sentences.
  • Choice: lead with option name. One sentence reason. No hedging.
  • Risks: 2–4 real blockers. Not generic "might take longer."
  • Next: one concrete action, not a plan.
  • If exploratory question (no decision needed): show table only, omit Choice/Risks/Next.

Example

Decision: session storage strategy for auth

Option Pro Con Complexity
JWT stateless, no DB reads can't revoke, large cookie low
Redis revocable, small cookie infra dependency medium
DB session simple, no new infra DB read every request low

Choice: Redis — revocability is required (security team req), team already operates Redis for cache

Risks:

  • Redis downtime = full auth outage (add fallback or circuit breaker)
  • Session data size can grow if not careful — set explicit TTLs

Next: Add ioredis to package.json, write src/lib/session.ts

One-shot. Does not persist.

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. 9d ago First seen · 54 lines · 40 tokens per session scan A 2a1083a8cc04

Subscribe to this mod's changes

pith-arch is a skill published in the GitHub repository abhisekjha/pith (98 stars, last pushed 4mo ago), licensed MIT. It adds 40 tokens to every session and 437 once invoked, about $0.0002 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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