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Agent skill

Nansen Web Fetcher

by nansen-ai in nansen-ai/nansen-cli

Fetch and analyze content from one or more URLs using AI (Gemini 2.5 Flash).

MITAuto-check passedProductivity & Automation

Install Nansen Web Fetcher

skills CLI
$ npx skills add nansen-ai/nansen-cli --skill nansen-web-fetcher -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install nansen-ai/nansen-cli nansen-web-fetcher --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/nansen-ai/nansen-cli.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/nansen-web-fetcher .claude/skills/nansen-web-fetcher && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
nansen-web-fetcher
GitHub stars
139
Token cost
~664 tokens
SKILL.md length
214 words
Files
1
Skills in repo
32
Repo updated
First seen
Licence
MIT

At a glance

Fetch and analyze content from one or more URLs using AI (Gemini 2.5 Flash).

  • You have specific URLs and need to extract
  • Reaches nansen.ai and other.com; needs NANSEN_API_KEY
  • Summarize their content

What it does

Nansen Web Fetcher is an agent skill from nansen-ai/nansen-cli. Fetch and analyze content from one or more URLs using AI (Gemini 2.5 Flash). Use when you have specific URLs and need to extract or summarize their content. Pairs well with nansen web search results.

Its SKILL.md is about 660 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Productivity & Automation, covering Web search. The licence is MIT.

When your agent uses it

  • You have specific URLs and need to extract
  • Summarize their content

Example prompts

  • “/nansen-web-fetcher”

Requirements

  • A credential in NANSEN_API_KEY
  • Pre-approved tools (allowed-tools): Bash(nansen:*)

What it can do on your machine

Read from SKILL.md and the folder at commit d097942. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves these tools, so the agent can use them without asking each time:

    • Bash(nansen:*)

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are bash).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    Hosts in commands or code, which the agent is likely to contact:

    • nansen.ai
    • other.com
    • docs.uniswap.org
    • blog.uniswap.org

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names these keys or tokens, usually read from environment variables:

    • NANSEN_API_KEY

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Nansen Web Fetcher loads about 664 tokens when it runs. Until then it costs about 55 tokens; SKILL.md has 214 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~55
When it runs · the whole SKILL.md, loaded when a task matches
~664

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from nansen-ai/nansen-cli at commit d097942, republished under its MIT licence (© nansen-ai). 214 words, ~664 tokens.

Download SKILL.mdSave it as .claude/skills/nansen-web-fetcher/SKILL.md (or your agent's skills folder).
name
nansen-web-fetcher
description
Fetch and analyze content from one or more URLs using AI (Gemini 2.5 Flash). Use when you have specific URLs and need to extract or summarize their content. Pairs well with `nansen web search` results.
allowed-tools
Bash(nansen:*)

Authentication

Nansen account API calls accept a selected nansen:api browser session or conventional API key with the same permissions. NANSEN_API_KEY takes precedence; optional primaryEnv preserves configured-key injection. Run nansen auth status for offline selection. Cached access expiry alone permits automatic renewal during an authorized task. Stop on anonymous selection, invalid state, blocked/uncertain renewal or actual auth failure; never drop a credential or fall back to anonymous x402 payment. Browser login does not grant wallet signing, privileged service identity or a persistent MCP integration key. Preserve all confirmation, signing, sanctions and geographic checks below. Browser login is available in CLI 2.0.0 within the macOS arm64 preview scope.

Web Fetch

Fetch and analyze content from one or more URLs using Gemini 2.5 Flash with URL context.

bash
nansen web fetch https://nansen.ai --question "What products does Nansen offer?"
nansen web fetch --url https://example.com --url https://other.com --question "Compare these two sites"
nansen web fetch https://docs.uniswap.org/contracts/v4/overview --question "What changed in v4?"

Positional args and --url flags can be combined — all become URLs to fetch.

FlagValuesDefaultPurpose
--urlURL—URL to fetch (repeatable for multiple URLs, up to 20)
--questionstringrequiredQuestion to answer about the URL content
--prettyflagoffHuman-readable JSON

Returns:

  • analysis — AI-generated answer to your question
  • retrieved_urls — URLs successfully fetched
  • failed_urls — URLs that could not be retrieved

Tip: Combine with web search — search first to find relevant URLs, then fetch to get full content.

bash
# Find and analyze in two steps
nansen web search "uniswap v4 launch" --num-results 3 --fields link
nansen web fetch https://blog.uniswap.org/... --question "What are the key changes?"

Note: 30s timeout. Paywalled or bot-blocked pages may appear in failed_urls.

© nansen-ai, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in skills/nansen-web-fetcher of nansen-ai/nansen-cli.

Open the folder on GitHubat commit d097942

Compare with similar skills

Nansen Web Fetcher next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Nansen Web Fetcher compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Nansen Web Fetcher this skillnansen-ai/nansen-cli139—~664Automated safety check: PassMIT
Brave Searchbadlogic/pi-skills2.6k5 repos~592Automated safety check: PassMIT
Enterprise AI Scenario MapMetaInFLow/Enterprise-ai-scenario-map-skill632—~1.8kAutomated safety check: PassMIT
Web Searchjjyaoao/HelloAgents3.2k1 repos~5.6kAutomated safety check: PassMIT
Ddg SearchTheSyart/claude-agent-examples4071 repos~493Automated safety check: PassNone
Local Web SearchuluckyXH/OpenMOSS1.3k—~392Automated safety check: NotesMIT

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Categories

Questions about Nansen Web Fetcher

What does Nansen Web Fetcher do?

Fetch and analyze content from one or more URLs using AI (Gemini 2.5 Flash). Nansen Web Fetcher is an agent skill from nansen-ai/nansen-cli.5 Flash).

When should I use Nansen Web Fetcher?

Nansen Web Fetcher fits situations like: you have specific URLs and need to extract; summarize their content.

How do I install Nansen Web Fetcher in Claude Code?

Run `npx skills add nansen-ai/nansen-cli --skill nansen-web-fetcher -a claude-code`. Or copy the skill folder (skills/nansen-web-fetcher in nansen-ai/nansen-cli) into .claude/skills/nansen-web-fetcher in your project. Claude Code loads it when a task matches its description.

How do I install Nansen Web Fetcher in Codex?

Run `npx skills add nansen-ai/nansen-cli --skill nansen-web-fetcher -a codex`. Or copy the skill folder (skills/nansen-web-fetcher in nansen-ai/nansen-cli) into .agents/skills/nansen-web-fetcher in your project. Codex loads it when a task matches its description.

Can I use Nansen Web Fetcher in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add nansen-ai/nansen-cli --skill nansen-web-fetcher -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/nansen-web-fetcher, .gemini/skills/nansen-web-fetcher, .github/skills/nansen-web-fetcher and .opencode/skills/nansen-web-fetcher in your project.

What does Nansen Web Fetcher need to run?

Going by SKILL.md and its folder, Nansen Web Fetcher needs credentials named NANSEN_API_KEY. Our summary lists: A credential in NANSEN_API_KEY. Its frontmatter pre-approves these tools: Bash(nansen:*).

Does Nansen Web Fetcher access the network?

SKILL.md names 4 domains. In commands or code: nansen.ai, other.com, docs.uniswap.org and blog.uniswap.org; the agent is likely to contact these when it follows the instructions. This is read from the text; nothing was executed.

Is Nansen Web Fetcher safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Nansen Web Fetcher use?

Nansen Web Fetcher is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Nansen Web Fetcher use?

About 664 tokens (SKILL.md is roughly 2.7k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Nansen Web Fetcher?

Skills that share tags, products or a category with Nansen Web Fetcher: Brave Search (badlogic/pi-skills, 2.6k stars), Enterprise AI Scenario Map (MetaInFLow/Enterprise-ai-scenario-map-skill, 632 stars), Web Search (jjyaoao/HelloAgents, 3.2k stars) and Ddg Search (TheSyart/claude-agent-examples, 407 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Nansen Web Fetcher?

nansen-ai (a GitHub organization) maintains it in nansen-ai/nansen-cli, which has 139 GitHub stars. The repository holds 32 skills in this directory. The repository was last updated on October 9, 2026.

Source: nansen-ai/nansen-cli on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.