A codebase-discovery and architecture-documentation skill for Bobby agents. It creates shared files describing how a project is organized and records important design decisions.

Documenting architecture, creating a short startup summary, seeding decision records, and responding to architecture-related triggers.

It gives agents a common understanding of the project so they do not repeatedly rediscover its structure or make decisions that conflict with existing ones.

bobby-arch — Skill by ccevans

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 skills/ccevans/bobbycode/bobby-arch

Any agent

npx skills add ccevans/bobbycode --skill bobby-arch

Clone the repo

git clone --depth 1 https://github.com/ccevans/bobbycode

Made for: Claude Code, Codex.

Per session 50 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 233 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.

Model	Per session	Once invoked
Fable 5	$0.00050	$0.00233
Opus 5	$0.00025	$0.00117
Sonnet 5	$0.00010	$0.00047
Haiku 4.5	$0.00005	$0.00023

Measured yesterday against content hash 0bab1e66168a, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

bobby-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 yesterday.

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.

.claude/skills/bobby-arch/SKILL.md · 23 lines

What it actually says

Bobby Arch Skill

Autonomously learns the codebase, writes .bobby/architecture.md (full reference), .bobby/architecture-wakeup.md (compressed ~300-token summary loaded by all agents), and seeds .bobby/decisions.yaml (enforced by bobby-review).

Load and follow the agent instructions in .claude/agents/bobby-arch.md.

Project overrides

If .claude/skills/bobby-arch/SKILL.local.md exists, read it and follow it. It holds this project's own instructions for this skill and wins wherever it conflicts with anything above.

SKILL.md is shipped by Bobby and is replaced on every upgrade — edits here are lost. SKILL.local.md is yours and is never overwritten.

Files

What ships with it

2 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.

yesterday First seen · 23 lines · 50 tokens per session scan A 0bab1e66168a

Subscribe to this mod's changes

bobby-arch is a skill published in the GitHub repository ccevans/bobbycode (6 stars, last pushed 8d ago), licensed MIT. It adds 50 tokens to every session and 233 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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