Arbor is an autonomous research agent that proposes hypotheses, edits code, runs experiments, and retains improvements that succeed on held-out data in a growing hypothesis tree. Researchers use it to investigate problems and iteratively optimize solutions with real experiments. The catalogue skills and plugin expose Arbor's research-agent workflow to coding agents.
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.
npx skills add RUC-NLPIR/Arbor --skill arbor-agent-searchgit clone --depth 1 https://github.com/RUC-NLPIR/ArborWrote 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.
[](https://agentmods.dev/skills/ruc-nlpir/arbor/arbor-agent-search)<a href="https://agentmods.dev/skills/ruc-nlpir/arbor/arbor-agent-search"><img src="https://agentmods.dev/badge/skills/ruc-nlpir/arbor/arbor-agent-search/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.
<a href="https://agentmods.dev/skills/ruc-nlpir/arbor/arbor-agent-search"><img src="https://agentmods.dev/badge/skills/ruc-nlpir/arbor/arbor-agent-search.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00055 | $0.00684 |
| Opus 5 | $0.00028 | $0.00342 |
| Sonnet 5 | $0.00011 | $0.00137 |
| Haiku 4.5 | $0.00006 | $0.00068 |
Grade A, and why
arbor-agent-search 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 10d 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.
How it starts
The opening of the file, as written. The whole thing — 111 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Arbor Search Agent
Use this for post-experiment related-work annotation. It is not for internal codebase search; use normal file tools for that.
Eligibility Gate
By default, only search nodes that are validated and effective:
- node status is
doneormerged; - node has a numeric score;
- score improves over current
trunk_score, or overbaseline_scoreif trunk is unavailable.
Skip pending, running, unscored, and below-trunk nodes. This keeps novelty cost tied to merge candidates.
When To Search
- After
RunExecutorreturns a node withscore > trunk_score. - Before
GitMergeBranchwhen novelty or related work affects the decision. - After parallel executor results, annotate all sibling winners with
SearchIdeaContextParallel.
Do not search trivial parameter tweaks, pure scale-ups, or internal codebase questions.
SearchAgent Task
The SearchAgent is a novelty scout. It does not implement, critique, or change
the idea. It surveys prior work and writes a Markdown annotation to
node.related_work.
Use 2-3 query angles:
- technique class;
- application domain;
- key mechanism.
For ML/NLP literature, use English academic queries with words such as
paper, arxiv, or survey; include one original-language query when useful.
Hard Caps
- At most 2 search rounds.
- Visit up to 5 pages total.
- Keep the result short enough for a researcher to judge novelty quickly.
Final JSON Schema
When running an isolated SearchAgent, ask it to emit only:
{
"summary": "2-4 sentences describing prior work.",
"related_papers": [
{
"title": "Paper title",
"url": "https://...",
"one_line_relevance": "Why this is relevant."
}
],
"novelty_assessment": "novel | partial-overlap | prior-art-exists",
"overlap_risks": "What specifically overlaps, or 'none'."
}
Render it into:
### Summary
...
### Related Papers
- [Title](url) - relevance
### Novelty
novel | partial-overlap | prior-art-exists - justification
### Overlap Risks
...
What ships with it
1 file 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.
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.
- 10d ago First seen · 111 lines · 55 tokens per session scan A acd467b6ac31
arbor-agent-search is a skill published in the GitHub repository RUC-NLPIR/Arbor (1,060 stars, last pushed 2d ago), licensed Apache-2.0. It adds 55 tokens to every session and 684 once invoked, about $0.0003 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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