yopedia

yopedia is a skill for Claude Code, Codex from yologdev/yoyo-evolve. It costs 25 tokens per session (1,399 once invoked), scanned A, original, MIT.

A personal knowledge vault, or searchable second brain, for saving and recalling research and reflections across coding-agent sessions.

In plain words
What is it for?
Use it to search your existing notes before researching, then save useful conclusions, decisions, and reflections for future sessions.
Why use it?
It prevents useful findings from being lost and lets later work build on earlier notes instead of repeating research.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

About the project

yoyo-evolve is a terminal coding agent that reads and changes its own Rust source code, runs tests, and commits its improvements. It is for users who want an autonomous agent that can navigate codebases, edit multiple files, run tests, manage Git, and recover from failures. The catalogue entries are skills for working with this coding agent.

yologdev/yoyo-evolve · 1,869 stars · on GitHub · yoyo.yolog.dev

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/yologdev/yoyo-evolve/yopedia
Any agent
npx skills add yologdev/yoyo-evolve --skill yopedia
Clone the repo
git clone --depth 1 https://github.com/yologdev/yoyo-evolve

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.

agentmods badge for yopedia

README.md
[![agentmods](https://agentmods.dev/badge/skills/yologdev/yoyo-evolve/yopedia.svg)](https://agentmods.dev/skills/yologdev/yoyo-evolve/yopedia)
Your own site
<a href="https://agentmods.dev/skills/yologdev/yoyo-evolve/yopedia"><img src="https://agentmods.dev/badge/skills/yologdev/yoyo-evolve/yopedia.svg" alt="Measured on agentmods" height="20"></a>
Per session 25 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,399 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00025 $0.01399
Opus 5 $0.00013 $0.00700
Sonnet 5 $0.00005 $0.00280
Haiku 4.5 $0.00003 $0.00140

Measured 6d ago against content hash 530f8c025efe, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

yopedia scanned grade A 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 6d 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.

Makes network callslowCapability

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

curl -sS "$BASE/api/wiki/search?q=<keyword>&scope=agent:$AGENT_ID"
skills/yopedia/SKILL.md · 104 lines

How it starts

The opening of the file, as written. The whole thing — 104 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Yopedia — your second brain

Yopedia (https://yopedia.yolog.dev) is your personal, persistent knowledge vault. Use it to save what you learn (so it doesn't evaporate after a session) and to recall what you already know (so you build on yourself instead of re-treading the same ground).

Setup (from env)

BASE=https://yopedia.yolog.dev
AGENT_ID="${YOPEDIA_AGENT_TOKEN%%.*}"     # the token text before the dot, e.g. alice--yoyo
VAULT="$YOPEDIA_VAULT_ID"        # which vault to file into — passed on every ingest

If $YOPEDIA_AGENT_TOKEN or $YOPEDIA_VAULT_ID is unset, your second brain isn't wired up yet — skip ingestion/recall silently and carry on. A yopedia call must never fail your actual work.

Recall FIRST

Before researching a topic, check what you already know and build on it. Lead with keyword search — it's your workhorse and needs no auth header (it still uses your agent-id, so the Setup skip-guard applies). Recall is agent-scoped, so it spans all your vaults (an evolve session recalls your dream-research notes too).

# 1. Keyword search (no auth) — YOUR MAIN RECALL.
#    Matches your term against note titles + bodies (stemmed word-family, NOT semantic),
#    so search the REAL terms of your topic — names, features, concepts — and try a
#    couple of phrasings if the first comes back empty:
curl -sS "$BASE/api/wiki/search?q=<keyword>&scope=agent:$AGENT_ID"

# 2. Whole index (no auth) — scan every note title you have, to see what's there at all:
curl -sS "$BASE/api/agents/$AGENT_ID/context"

# 3. Natural-language question (NEEDS your agent token) — a synthesized answer, not a list.
#    /api/query is authenticated; send the same token you ingest with. (Unconfirmed that the
#    Bearer token fully satisfies its gate — it rejected an unauthenticated call. If #3 errors,
#    just fall back to #1/#2.) Use when you want a digested answer rather than raw matches:
curl -sS -X POST "$BASE/api/query" \
  -H "Authorization: Bearer $YOPEDIA_AGENT_TOKEN" -H "Content-Type: application/json" \
  -d "{\"question\":\"What have I learned about <topic>?\",\"scope\":\"agent:$AGENT_ID\"}"

Read the full file on GitHub · 104 lines

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. 6d ago First seen · 104 lines · 25 tokens per session scan A 530f8c025efe

Subscribe to this mod's changes

yopedia is a skill published in the GitHub repository yologdev/yoyo-evolve (1,869 stars, last pushed today), licensed MIT. It adds 25 tokens to every session and 1,399 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 1 finding (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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