What is yesmem-cap-builder?

A method for saving a working command or multi-step workflow as a reusable CAP.md tool. The saved cap can be stored, deployed, and made available in later sessions.

Use it to turn a tested REPL snippet, bash command, or repeated workflow into a reusable session-spanning tool.

It prevents useful shell commands or workflows from being re-created by hand whenever the same task comes up again.

yesmem-cap-builder — Skill for Claude Code and Codex by carsteneu

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 carsteneu/yesmem --skill yesmem-cap-builder

Clone the repo

git clone --depth 1 https://github.com/carsteneu/yesmem

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/carsteneu/yesmem/yesmem-cap-builder/github.svg)](https://agentmods.dev/skills/carsteneu/yesmem/yesmem-cap-builder)

Your own site

<a href="https://agentmods.dev/skills/carsteneu/yesmem/yesmem-cap-builder"><img src="https://agentmods.dev/badge/skills/carsteneu/yesmem/yesmem-cap-builder/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/carsteneu/yesmem/yesmem-cap-builder"><img src="https://agentmods.dev/badge/skills/carsteneu/yesmem/yesmem-cap-builder.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 81 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 4,551 The whole file, excluding the scripts and references it only reads on demand.

Security scan B 2 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector warn 7 Sept 2026

SkillSpector: 1 finding, up to high

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

high Agent Snooping · line 282
Skill reads from agent configuration directories (.claude/, .codex/, .gemini/). These directories may contain API keys, personal settings, and other credentials that the skill has no legitimate need to access.

Fix: Remove all code or instructions that access agent configuration directories (.claude/, .codex/, .gemini/). If configuration values are needed, pass them explicitly as parameters or environment variabl

How audits are shown

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 5.1	$0.00081	$0.04551
Opus 5.5	$0.00032	$0.01820
Sonnet 5.5	$0.00016	$0.00910
Haiku 4.5	$0.00008	$0.00455

Measured 1mo ago against content hash 34f2c9580ecb, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

yesmem-cap-builder scanned grade B with 2 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 1mo 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.

Reads agent configuration directoriesmediumAgent snooping

.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.

| Source disagrees with disk after `make deploy` | DB-vs-disk write-back conflict. Diagnostic: `sha256sum caps/bundled-caps/<name>/CAP.md` vs `sha256sum ~/.claude/caps/<name>/CAP.md`; `grep '^version:' ~/.claude/caps/<na

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

const raw = await sh(`curl -s --max-time 15 "${URL}"`, 20000);

skills/bundled-skills/yesmem-cap-builder/SKILL.md · 337 lines

How it starts

The opening of the file, as written. The whole thing — 337 lines — stays where its author put it; the contents beside it link to each section on GitHub.

YesMem Cap Builder

A cap is a CAP.md file (YAML frontmatter + ## Purpose + ## Scripts + optional ## Database + optional ## Actions) that yesmem persists as a learnings row, deploys to ~/.claude/caps/<name>/CAP.md, and re-injects into future sessions via the proxy. Caps are how an ad-hoc REPL command becomes a session-spanning, queryable tool.

This skill is the discovery surface. Side-files in this directory hold the depth — open them when you actually need them.

Side-files (open on demand)

File	Open when
`recipes.md`	You're about to build a cap and want a working template to copy
`api-reference.md`	You're calling `save_cap`/`get_caps`/`activate_cap`/`cap_store`/`cap_proposal_decide` and need the exact param shape
`gotchas.md`	A cap fails on activate, save_cap silently stores garbage, `sh()` returns truncated output, or anything else surprises you

External references

Cap-Spec (canonical format): https://github.com/carsteneu/cap-spec — treat as authoritative for CAP.md structure, frontmatter rules, and the v1.1 multi-script format. Note: spec.md is at v1.1-draft, but cap-spec/examples/*/CAP.md are still v1.0 — see gotchas.md "Cap-spec format drift" before copying.
Working caps to copy from: caps/bundled-caps/wiki_export/CAP.md (current, v1.1, ~16 KB embedded base64) and caps/bundled-caps/reddit_fetch/ are the freshest in-repo references.
yesmem CLI for caps: yesmem query --format objects (read-only SQL across yesmem.db/messages.db/caps.db/runtime.db, projection-wrapped JSON), yesmem json (gojq-style filter pipeline, no --slurpfile), yesmem cap-blob-put (chunked blob ingest, bypasses the 30 KB sh() wall). Bash-runtime caps wire these together — see recipes.md "Cap that pipes yesmem query into yesmem json" and api-reference.md "yesmem CLI surface for caps".

When to build a cap

Working command/script the user will reach for again next week
Multi-step REPL sequence likely to recur
Output deserves to be queryable later (search, aggregate, meta-analyze)
Trigger phrases: "save this", "build a cap", "make this reusable", "/build-tool"

Read the full file on GitHub · 337 lines

Files

What ships with it

3 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.

1mo ago First seen · 337 lines · 81 tokens per session scan B 34f2c9580ecb

Subscribe to this mod's changes

yesmem-cap-builder is a skill published in the GitHub repository carsteneu/yesmem (45 stars, last pushed 10d ago), licensed Apache-2.0. It adds 81 tokens to every session and 4,551 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it B with 2 findings (reads agent configuration directories, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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yesmem-cap-builder