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Agent skill

Evidence Based Citations

by OpenHands in OpenHands/extensions

Back factual claims and field values with official, verifiable sources.

MITAuto-check passedResearch & Science

Install Evidence Based Citations

skills CLI
$ npx skills add OpenHands/extensions --skill evidence-based-citations -a claude-code

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

GitHub CLI
$ gh skill install OpenHands/extensions evidence-based-citations --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/OpenHands/extensions.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/evidence-based-citations .claude/skills/evidence-based-citations && 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
evidence-based-citations
GitHub stars
157
Token cost
~795 tokens
SKILL.md length
435 words
Files
5
Skills in repo
78
Repo updated
First seen
Licence
MIT

At a glance

Back factual claims and field values with official, verifiable sources.

  • Works in 4 steps: Prefer primary sources, in this order → Accept secondary sources (blog posts,… → The Quote field must contain text that… → …
  • The user asks to fill fields
  • SKILL.md covers Output format, Source selection rules, When to fetch and Example, plus 1 more section
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Evidence Based Citations is an agent skill from OpenHands/extensions. Back factual claims and field values with official, verifiable sources. Use when the user asks to fill fields, answer questions, or make claims that must be supported by an exact quote and an official link.

Its SKILL.md is about 800 tokens, which your agent loads only when the skill is triggered. The skill folder holds 5 other files (for example `.plugin/plugin.json` and `README.md`).

It sits in Research & Science, covering Citation management. The repository describes itself as: Public registry for OpenHands extensions. The licence is MIT.

When your agent uses it

  • The user asks to fill fields
  • Answer questions
  • Make claims that must be supported by an exact quote and an official link

Example prompts

  • “/evidence-based-citations”

Workflow steps

4 steps, taken from the first numbered list in SKILL.md.

  1. Prefer primary sources, in this order
  2. Accept secondary sources (blog posts, Stack Overflow, forum threads, news articles, third-party tutorials) only as a last resort, and…
  3. The Quote field must contain text that actually appears at the Source URL. Do not paraphrase inside the quote, and do not stitch together…
  4. If you cannot find an official source for a value, say so explicitly

What it can do on your machine

Read from SKILL.md and the folder at commit d008b81. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

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

  • Network

    Links to these hosts (documentation or services it may open):

    • rfc-editor.org

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

  • Credentials

    Names no API keys, tokens, secrets or passwords.

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

Context cost

Evidence Based Citations loads about 795 tokens when it runs. Until then it costs about 58 tokens; SKILL.md has 435 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~58
When it runs · the whole SKILL.md, loaded when a task matches
~795

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 OpenHands/extensions at commit d008b81, republished under its MIT licence (© OpenHands). 435 words, ~795 tokens.

Download SKILL.mdSave it as .claude/skills/evidence-based-citations/SKILL.md (or your agent's skills folder). This skill also uses 4 other files; get the full folder from GitHub.
name
evidence-based-citations
description
Back factual claims and field values with official, verifiable sources. Use when the user asks to fill fields, answer questions, or make claims that must be supported by an exact quote and an official link.
triggers
evidence-based, cite source, cite sources, official source, official link, official links, official docs, official documentation, verifiable source

The user wants every field value or factual claim you produce in the current response to be backed by an official, verifiable source. Apply this skill to the response that triggered it; do not assume it stays active for the rest of the conversation unless the user clearly asks for it to.

Output format

For each field or claim, respond with exactly these four labeled lines:

  • Field: the field name (or a short description of the claim)
  • Value: the value you are assigning (or the claim itself)
  • Quote: the exact verbatim text from the source that supports the value
  • Source: the official URL where the quote can be found

When there are multiple fields, repeat the block once per field. Keep blocks separated by a blank line.

Source selection rules

  1. Prefer primary sources, in this order:
    • Official product / project documentation
    • Standards documents (RFCs, W3C specs, ISO standards)
    • Official API references
    • Source code in the project's own repository
  2. Accept secondary sources (blog posts, Stack Overflow, forum threads, news articles, third-party tutorials) only as a last resort, and clearly label them as such in Source.
  3. The Quote field must contain text that actually appears at the Source URL. Do not paraphrase inside the quote, and do not stitch together text from different parts of the page without making the cut explicit (e.g. with …).
  4. If you cannot find an official source for a value, say so explicitly:
    • Source: No official source found. Then either omit the value, mark it as unverified, or ask the user how to proceed. Never invent a quote or URL.
Show full SKILL.md (170 more words)Show less

When to fetch

  • If you have a browser / fetch tool available, retrieve the source page and copy the quote directly from it before responding.
  • If you do not have a fetch tool, always respond with Source: No official source found. rather than citing URLs from memory. LLMs cannot reliably verify URL accuracy or quote fidelity without actually fetching the page, even when a URL feels familiar.

Example

User: What HTTP status code indicates a successful request, per the HTTP semantics RFC?

What this skill is not

  • It is not a general "be careful with facts" reminder. Apply the strict four-field format only when the user has invoked this skill or is clearly asking for evidence-backed answers.
  • It does not change how you write code, edit files, or run tools. It only governs how you report values and claims back to the user.

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

Files

SKILL.md and 4 other files in skills/evidence-based-citations of OpenHands/extensions.

  • SKILL.md
  • .claude-plugin
  • .codex-plugin
  • .plugin/plugin.json
  • README.md

Open the folder on GitHubat commit d008b81

Compare with similar skills

Evidence Based Citations 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.

Evidence Based Citations compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Evidence Based Citations this skillOpenHands/extensions157—~795Automated safety check: PassMIT
Content Research Writerweapp-tailwindcss/weapp-tailwindcss1.9k25 repos~3.5kAutomated safety check: PassMIT
NetworkxzLanqing/codex-claude-academic-skills4.6k16 repos~3.2kAutomated safety check: PassBSD-3-Clause
Citation Verification GuideGalaxy-Dawn/claude-scholar5.7k3 repos~1.9kAutomated safety check: PassMIT
Systematic Review ScreenerImbad0202/academic-research-skills51k—~8.4kAutomated safety check: PassCustom licence
Literature Reviewneflibata-feng/MyArxiv-Agent12621 repos~5.9kAutomated safety check: NotesMIT

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  • Content Research Writer

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Categories

Questions about Evidence Based Citations

What does Evidence Based Citations do?

Back factual claims and field values with official, verifiable sources. Evidence Based Citations is an agent skill from OpenHands/extensions. Back factual claims and field values with official, verifiable sources.

When should I use Evidence Based Citations?

Evidence Based Citations fits situations like: the user asks to fill fields; answer questions; make claims that must be supported by an exact quote and an official link.

How do I install Evidence Based Citations in Claude Code?

Run `npx skills add OpenHands/extensions --skill evidence-based-citations -a claude-code`. Or copy the skill folder (skills/evidence-based-citations in OpenHands/extensions) into .claude/skills/evidence-based-citations in your project. Claude Code loads it when a task matches its description.

How do I install Evidence Based Citations in Codex?

Run `npx skills add OpenHands/extensions --skill evidence-based-citations -a codex`. Or copy the skill folder (skills/evidence-based-citations in OpenHands/extensions) into .agents/skills/evidence-based-citations in your project. Codex loads it when a task matches its description.

Can I use Evidence Based Citations 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 OpenHands/extensions --skill evidence-based-citations -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/evidence-based-citations, .gemini/skills/evidence-based-citations, .github/skills/evidence-based-citations and .opencode/skills/evidence-based-citations in your project.

What does Evidence Based Citations need to run?

SKILL.md names no scripts, command-line tools or credentials: Evidence Based Citations is instructions for the agent only.

Does Evidence Based Citations access the network?

SKILL.md names 1 domain. As links in the text: rfc-editor.org. This is read from the text; nothing was executed.

Is Evidence Based Citations 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 Evidence Based Citations use?

Evidence Based Citations 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 Evidence Based Citations use?

About 795 tokens (SKILL.md is roughly 3.2k 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 Evidence Based Citations?

Skills that share tags, products or a category with Evidence Based Citations: Content Research Writer (weapp-tailwindcss/weapp-tailwindcss, 1.9k stars), Networkx (zLanqing/codex-claude-academic-skills, 4.6k stars), Citation Verification Guide (Galaxy-Dawn/claude-scholar, 5.7k stars) and Systematic Review Screener (Imbad0202/academic-research-skills, 51k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Evidence Based Citations?

OpenHands (a GitHub organization) maintains it in OpenHands/extensions, which has 157 GitHub stars. The repository holds 78 skills in this directory. The repository was last updated on October 6, 2026.

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