knowledge-base

knowledge-base is a skill for Claude Code, Codex from zach-blumenfeld/knowledge-index. It costs 94 tokens per session (4,532 once invoked), scanned A, original, Apache-2.0.

A skill for searching and navigating a Markdown knowledge base, such as a folder of notes, documentation, or a wiki. It uses an index of documents, headings, and links to retrieve relevant sections instead of reading every file.

In plain words
What is it for?
Use it to build or maintain the index, search notes, inspect the structure of a knowledge base, read selected sections, and answer questions grounded in those documents.
Why use it?
It makes questions across many Markdown files easier to answer and preserves the links between related notes. It is not intended for source code, non-Markdown files, or one known file.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: mentions subagents.

Good fit Use it to build or maintain the index, search notes, inspect the structure of a knowledge base, read selected sections, and answer questions grounded in those documents.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/zach-blumenfeld/knowledge-index/knowledge-base
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 zach-blumenfeld/knowledge-index --skill knowledge-base
Clone the repo
git clone --depth 1 https://github.com/zach-blumenfeld/knowledge-index

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 knowledge-base

README.md
[![agentmods](https://agentmods.dev/badge/skills/zach-blumenfeld/knowledge-index/knowledge-base/github.svg)](https://agentmods.dev/skills/zach-blumenfeld/knowledge-index/knowledge-base)
Your own site
<a href="https://agentmods.dev/skills/zach-blumenfeld/knowledge-index/knowledge-base"><img src="https://agentmods.dev/badge/skills/zach-blumenfeld/knowledge-index/knowledge-base/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 knowledge-base

Your own site · 80×15
<a href="https://agentmods.dev/skills/zach-blumenfeld/knowledge-index/knowledge-base"><img src="https://agentmods.dev/badge/skills/zach-blumenfeld/knowledge-index/knowledge-base.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 94 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 4,532 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. ✓ AI security review Fable 5.1 · 7 Sept 2026 📄 Read the review
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 $0.00094 $0.04532
Opus 5.5 $0.00038 $0.01813
Sonnet 5.5 $0.00019 $0.00906
Haiku 4.5 $0.00009 $0.00453

Measured 1mo ago against content hash 0add6b40b136, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

knowledge-base 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 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.

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/knowledge-base/SKILL.md · 224 lines

How it starts

The opening of the file, as written. The whole thing — 224 lines — stays where its author put it; the contents beside it link to each section on GitHub.

ki — Usage

Trigger When

Reach for ki whenever the work involves a directory of markdown (notes, docs, a wiki, a "second brain") — it's your default read/search tool there:

  • Set up / maintain a knowledge base on a folder (index it, keep it in sync).
  • Search / find across the corpus — "what did I write about X?", "find the note on Y."
  • Navigate / summarize — "what's in this vault?", its structure or coverage.
  • Get / read specific sections or documents without opening whole files.
  • Answer questions grounded in the user's notes/docs.
  • Vault-wide / structural / inference questions — what's load-bearing, how things connect.

Rule of thumb: any time you'd otherwise grep / cat / read across a folder of .md, use ki instead.

Do Not Use When

  • The source isn't markdown and isn't being converted — ki indexes .md only (see the note under On First Use).
  • Source code or non-prose — use grep / ripgrep / editor tooling; ki models prose structure (headings, links), not code.
  • A single known file or quick one-off read where indexing isn't worth it — just Read it.

What ki is

A command-line tool that builds a queryable knowledge graph index over a directory of markdown. It parses each .md into its documents, sections, and the wikilinks between them, stores that structure in Neo4j, and exposes fast search, navigation, and retrieval over it — so you can find and read the right slice of content without opening and scanning whole files.

Why use ki

It's faster and far cheaper in tokens than raw file ops over a markdown corpus. Instead of grepping and reading entire files into context, you query an index and pull just the sections you need — structure (headings, containment, links) is preserved, so retrieval is targeted. See Usage for the specific jobs it beats file ops at.

Key Terms

Read the full file on GitHub · 224 lines

Files

What ships with it

4 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.

  1. 1mo ago First seen · 224 lines · 94 tokens per session scan E 0add6b40b136

Subscribe to this mod's changes

knowledge-base is a skill published in the GitHub repository zach-blumenfeld/knowledge-index (24 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 94 tokens to every session and 4,532 once invoked, about $0.0004 per session on Opus 5.5. 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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