What is anserini-fatjar?

A setup guide for Anserini, an information-retrieval toolkit, that downloads its ready-to-run Java package from Maven Central instead of compiling the project.

Use it to check Java and download prerequisites, fetch the latest fat JAR, run smoke tests, reproduce the CACM example, inspect catalogs, use the Search CLI, or start RestServer.

It avoids a full Maven build when you need to install Anserini quickly and verify that it runs.

anserini-fatjar — Skill for Codex by castorini/castorini-skills

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 castorini/castorini-skills --skill anserini-fatjar

Clone the repo

git clone --depth 1 https://github.com/castorini/castorini-skills

Made for: 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/castorini/castorini-skills/anserini-fatjar/github.svg)](https://agentmods.dev/skills/castorini/castorini-skills/anserini-fatjar)

Your own site

<a href="https://agentmods.dev/skills/castorini/castorini-skills/anserini-fatjar"><img src="https://agentmods.dev/badge/skills/castorini/castorini-skills/anserini-fatjar/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/castorini/castorini-skills/anserini-fatjar"><img src="https://agentmods.dev/badge/skills/castorini/castorini-skills/anserini-fatjar.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 48 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 3,131 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.

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	$0.00048	$0.03131
Opus 5.5	$0.00019	$0.01252
Sonnet 5.5	$0.00010	$0.00626
Haiku 4.5	$0.00005	$0.00313

Measured 2mo ago against content hash a55398ab6aa5, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

anserini-fatjar 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 2mo ago.

The scan reads SKILL.md. This mod also ships 2 executable files (scripts/fetch_latest_fatjar.sh, scripts/verify_fatjar_workflow.sh), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

wget --version

skills/anserini-fatjar/SKILL.md · 286 lines

How it starts

The opening of the file, as written. The whole thing — 286 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Anserini Fatjar

Overview

Use this skill to install and run Anserini quickly by downloading the latest fatjar from Maven Central into the current working directory.

Validation note:

Validated on 2026-03-27 against anserini-1.7.1-fatjar.jar
Verified locally: fatjar download, cacm-download reproduction, catalog lookups, Search CLI, and RestServer

Workflow

Verify runtime tools.
Download the latest fatjar from Maven Central.
Run smoke test/help command.
Execute target commands.

For a reusable end-to-end check of the documented workflow, run:

SKILL_DIR="/path/to/anserini-fatjar"
bash "$SKILL_DIR/scripts/verify_fatjar_workflow.sh"

1. Verify Runtime Tools

Run:

java -version
javac -version
wget --version

Require:

JDK 21 available on PATH for both java and javac
wget available on PATH
Optional: jq available on PATH for JSON filtering commands below

Stop immediately and warn the user if prerequisites are not satisfied. In particular:

If java -version or javac -version does not report JDK 21, do not continue.
If wget is missing, do not continue with Maven Central download steps.
If jq is missing, continue only when JSON filtering is unnecessary or replace those examples with an equivalent plain-text inspection.

2. Download Latest Fatjar

From the skill directory, run:

SKILL_DIR="/path/to/anserini-fatjar"
bash "$SKILL_DIR/scripts/fetch_latest_fatjar.sh"

This script probes Maven Central metadata at https://repo1.maven.org/maven2/io/anserini/anserini/maven-metadata.xml, extracts the current release, and downloads anserini-<version>-fatjar.jar from the matching official artifact path. At the moment, a direct example URL is:

wget https://repo1.maven.org/maven2/io/anserini/anserini/1.7.1/anserini-1.7.1-fatjar.jar

All subsequent commands assume the jar is available in the current working directory as anserini-<version>-fatjar.jar. Resolve the filename dynamically before invoking Java:

Read the full file on GitHub · 286 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.

2mo ago First seen · 286 lines · 48 tokens per session scan A a55398ab6aa5

Subscribe to this mod's changes

anserini-fatjar is a skill published in the GitHub repository castorini/castorini-skills (2 stars, last pushed 7mo ago), licensed Apache-2.0. It adds 48 tokens to every session and 3,131 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-08-31.

Research

anserini-fatjar next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
anserini-fatjarcastorini/castorini-skills	Skill	2	7mo ago	Apache-2.0	A	48	Codex
imagegenopenai/codex	Skill	133k	yesterday	Apache-2.0	A	113	Codex
playwright-climicrosoft/playwright	Skill	99k	yesterday	Apache-2.0	A	19	Claude Code
local-ai-agentsmicrosoft/ai-agents-for-beginners	Skill	79k	4d ago	MIT	A	200	Claude Code, Codex
systematic-debuggingobra/superpowers	Skill	313k	3d ago	MIT	A	21	Claude Code
next-cache-components-adoptionvercel/next.js	Skill	143k	yesterday	MIT	A	95	Claude Code
next-partial-prefetching-adoptionvercel/next.js	Skill	143k	yesterday	MIT	A	103	Claude Code

anserini-fatjar