wiki

wiki is a skill for Claude Code from plasma-ai/fractal. It costs 18 tokens per session (1,294 once invoked), scanned A, original, Apache-2.0.

A command-line tool and set of indexed folders for storing project knowledge and private agent memory. It organizes information in index files so it can be searched, read, and updated.

In plain words
What is it for?
Use it to maintain shared project documentation, private memory, todo lists, and searchable knowledge about a codebase.
Why use it?
It keeps project decisions, conventions, tasks, and personal notes findable instead of scattered across files or forgotten between tasks.

Skill for Claude Code

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

Part of the fractal plugin — 4 skills, 4 agents shipped together

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/plasma-ai/fractal/wiki
Any agent
npx skills add plasma-ai/fractal --skill wiki
Clone the repo
git clone --depth 1 https://github.com/plasma-ai/fractal

Made for: Claude Code.

Or install fractal, the plugin that ships this one along with the rest of its 4 skills, 4 agents.

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 wiki

README.md
[![agentmods](https://agentmods.dev/badge/skills/plasma-ai/fractal/wiki.svg)](https://agentmods.dev/skills/plasma-ai/fractal/wiki)
Your own site
<a href="https://agentmods.dev/skills/plasma-ai/fractal/wiki"><img src="https://agentmods.dev/badge/skills/plasma-ai/fractal/wiki.svg" alt="Measured on agentmods" height="20"></a>
Per session 18 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,294 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00018 $0.01294
Opus 5 $0.00009 $0.00647
Sonnet 5 $0.00004 $0.00259
Haiku 4.5 $0.00002 $0.00129

Measured 6d ago against content hash d643872e73e2, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

wiki 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 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.

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.

fractal/_node/skills/wiki/SKILL.md · 113 lines

How it starts

The opening of the file, as written. The whole thing — 113 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Wiki

A wiki is an indexed folder tree of _index.md files. A node works with two:

  • Project wiki ($WIKI_DIR) -- shared across nodes; per-branch, reaching others only through merges (use fractal radio for live coordination). Holds architecture, conventions, and patterns; contribute durable project-wide knowledge here.
  • Memory ($MEMORY_DIR) -- this node's private knowledge base. See the memory skill for how to maintain it.

Todo lists follow the same split: a private working checklist lives in memory; a task list other nodes should see and track lives in the project wiki. Either way it is living state -- current open items, pruned as they complete -- never an append-only log.

Run wiki --help and wiki <command> --help for the CLI (init, update, lint, map, search, read). Always pass --path ($WIKI_DIR or $MEMORY_DIR) -- a bare command resolves the enclosing wiki by walking up, else {cwd}/wiki, which from the node's cwd is the project wiki at best and never memory, so an omitted --path silently targets the wrong wiki or errors. Run wiki update --path=<dir> after adding, moving, or deleting pages; wiki lint --path=<dir> validates structure.

Editing discipline

Name pages and folders in ascii snake_case (command_core, not command-core) -- both wikis enforce identifier-safe names (the project wiki's mirror the source modules they document), so wiki lint rejects hyphens and spaces.

wiki update regenerates derived state: each page's entry line in _index.md (name and description) is pulled from the page's own frontmatter, so fix a desc: on the page and rerun update -- hand edits to an index line are overwritten by the next update, and each page's H1 is rewritten to its name unless an authored frontmatter title: supplies the heading, which update keeps and renders as the H1 (index entry lines still show the name). wiki lint is regenerate-and-compare: it prints the diff wiki update would apply plus any real defects, and separates issues (must fix) from advisory notes. Work the loop -- edit pages, wiki update, wiki lint -- until clean (clean = lint exits 0; scripts branch on the exit code, not the prose summary); lint validates structure, not content truth, so verify facts against your sources yourself.

Read the full file on GitHub · 113 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 · 113 lines · 18 tokens per session scan A d643872e73e2

Subscribe to this mod's changes

wiki is a skill published in the GitHub repository plasma-ai/fractal (712 stars, last pushed today), licensed Apache-2.0. It adds 18 tokens to every session and 1,294 once invoked, about $0.0001 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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