Star200+

Percival

REVIEW · 65
Community indexed

📝 Web-based, reactive Datalog notebooks for data analysis and visualization

Downloads0
Stars636
Version1.0.0
Quality54/100 · Needs review
Trust65/100 · Sandbox only
Audit65/100 · Needs review

Supply asset profile

Data, BI, and analytics

CSV, SQL, notebooks, dashboards, data pipelines, BI, ETL, and spreadsheet analysis.

Browse track

Scenario

Data analysis

I need my agent to analyze CSV data, produce insights, and explain trends.

Agent fit

Claude Code + CLI + Codex

Codex, Claude Code, Cursor, CLI, or custom agents.

Install

Ready

npx skills add ekzhang/percival

Maintenance

stale

3y since push

Risk

Needs review

Repository appears stale

GitHub quality

636

54/100 Quality · 73/100 Trust

Coverage tags

DataData analysisdata-analysisdata-visualizationanalytics

Review notes

Repository appears stale · Repository looks stale

Agent adoption scorecard

Trust, audit, and install readiness at a glance

These scores combine public repository metadata, OpenAgentSkill review signals, maintenance freshness, and install readiness. They are a shortlist signal, not a replacement for human review.

Quality

Needs review
54

Inspect the repository carefully before adding it to an agent workflow.

Trust

Sandbox only
65

Useful candidate with missing or mixed trust signals. Keep it in an isolated workspace until the outcome loop proves task fit.

Audit

Needs review
65

A machine-readable review of install readiness, security metadata, maintenance, and adoption risk.

OpenAgentSkill Trust Score v5

Human review before install

Run only in a sandbox and compare close alternatives before using it for real work.

RustData VisualizationCodexClaude CodeCursor

Stars

636 GitHub stars

Repo activity

636 stars, 25 forks

Maintenance

3y since push

License

MIT

Install

npx skills add ekzhang/percival

Install safety

standard package or runtime install path

Permission surface

filesystem or document access

Agent outcomes

No agent outcome data yet

Docs

Usable metadata, review docs

Risk summary

Review before production

  • Repository looks stale
  • Quality score needs review
  • Recent maintenance: 3y since push

Install readiness

Install path available

  • Install path is available
  • Repository evidence is available
  • License is declared
  • No Agent Proven outcome evidence yet

Agent-readable metadata

Machine-readable decision data for this skill.

Use this block or the embedded JSON to decide whether an agent should install this skill, choose an alternative, or ask for human review first.

Open JSON

Suited tasks

  • Data analysis workflows
  • Claude Code teams
  • teams that value GitHub adoption signals
  • Load tabular data

Suited agents

RustData VisualizationCodexClaude CodeCursorOpenAgentSkill CLICLI

Install decision

Command
npx skills add ekzhang/percival
Policy
review
Human review
yes

Trust and risk

Trust
65/100
Audit
65/100
Risk level
Needs review

Outcome loop

Endpoint
/api/agent/outcome
Event ID
resolve
Outcomes
5

Install command

npx skills add ekzhang/percival
Public auditEval reportResolve APIInstall handoff

Do not use when

  • teams that require actively maintained dependencies
  • production agents without a repository review
  • Repository looks stale
  • Repository appears stale
  • Quality score needs review

Alternative

D3

113.1K Stars

npx skills add d3/d3

Alternative

Grafana

74.4K Stars

npx skills add grafana/grafana

Alternative

Superset

73.3K Stars

npx skills add apache/superset

Alternative

Echarts

66.6K Stars

npx skills add apache/echarts

Agent safety v2

45/100 · Avoid automatic install

Experimentalreview

Sparse or mixed signals. Useful for discovery, but not for autonomous installation.

Test manually in an isolated workspace and compare against safer alternatives.

Resolve via API

medium

Network access

Skill likely fetches remote pages, APIs, repositories, or external services.

medium

Filesystem access

Skill may read or write project files, documents, generated artifacts, or local workspace state.

medium

Database access

Skill may inspect schemas, query databases, or work with persistent stores.

  • Repository appears stale

Install targets

Install this skill in your agent workflow

Use the public install endpoint to fetch the command, safety checklist, target prompts, and canonical links for this skill.

skill install

OpenAgentSkill CLI

Use the registry command when your workflow supports the OpenAgentSkill installer.

$ npx skills add ekzhang/percival

Agent resolve plan

Let an agent verify fit before installing.

The Resolve API returns the selected skill, alternatives, safety policy, audit notes, install target, and copy-paste prompt an agent can follow without scraping this page.

Open text plan

Open JSON

/api/agent/resolve?task=Use%20Percival%20for%20an%20agent%20workflow&agent=codex&max_risk=medium

Resolve text

/api/agent/resolve?task=Use%20Percival%20for%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text

Install handoff

/api/skills/ekzhang-percival/install

Agent should check

  • Task fit and alternatives from Resolve API.
  • Audit score, trust score, and safety policy warnings.
  • Install target compatibility for Codex, Claude Code, Cursor, or CLI.

Copy prompt

Task: Use Percival in this workspace.
Resolve first: https://www.openagentskill.com/api/agent/resolve?task=Use%20Percival%20for%20an%20agent%20workflow&agent=codex&max_risk=medium
Review install handoff: https://www.openagentskill.com/api/skills/ekzhang-percival/install
Install command: npx skills add ekzhang/percival
Before running it, summarize audit warnings, required permissions, and the fallback skill if install is risky.

Agent handoff

Give an agent the install path, not another directory page.

Use the public install endpoint to fetch the command, safety checklist, target prompts, and canonical links for this skill.

Open install API

Install handoff

/api/skills/ekzhang-percival/install

LLM text format

/api/skills/ekzhang-percival/install?format=text

Find alternatives

/api/skills/search?q=Percival&limit=3

Agent prompt

Use Percival for this task. Review https://www.openagentskill.com/api/skills/ekzhang-percival/install, then install with: npx skills add ekzhang/percival

Registry metadata

Agent-readable profile for automatic skill selection.

This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.

Open manifest

Manifest

/api/registry/manifest/ekzhang-percival

LLM text

/api/registry/manifest/ekzhang-percival?format=text

Install alias

/api/registry/install/ekzhang-percival

Recommend

/api/registry/recommend?task=Use%20Percival%20in%20an%20agent%20workflow&limit=3

Agent fit

57/100

Data analysis

Use-case tags

Data analysisGitHub automationCoding agents

Platforms

Rust, Data Visualization, Claude Code

Audit report

Needs review · 65/100

A machine-readable review of install readiness, security metadata, maintenance, and adoption risk.

View audit reportView eval report

Agent decision cockpit

Needs validation for Data analysis

Do a manual repository review before adding this to an agent workflow.

57
Readiness
Review
Stage

Role in stack

Needs validation

Primary fit

Data analysis

Trust label

Needs manual review

Install path

Command ready

Use when

  • Data analysis workflows
  • Claude Code teams
  • teams that value GitHub adoption signals

Evidence

  • 636 GitHub stars
  • install command or GitHub repo available
  • 54/100 quality profile
  • 2 OpenAgentSkill engagement events

review first

  • Repository looks stale

Implementation path

  1. 1Install it in a sandbox agent and run one Data analysis task end to end.
  2. 2Compare output quality, latency, and failure behavior against at least one alternative.
  3. 3Promote it into production only after reviewing repository permissions, license, and maintenance signals.

Trust profile

Sandbox only

Useful candidate with missing or mixed trust signals. Keep it in an isolated workspace until the outcome loop proves task fit.

65
OpenAgentSkill Trust Score

GitHub adoption

INFO

636 GitHub stars

Stars/forks activity

INFO

636 stars, 25 forks; issue activity unavailable in current metadata

Recent maintenance

FIX

3y since push

License clarity

PASS

MIT

Good signals

  • AI review approved
  • Install path is available
  • Repository evidence is available
  • Meaningful GitHub adoption signal
  • Install command has no obvious high-risk pattern
  • Outcome loop is ready but needs first real agent run

Review before install

  • Repository looks stale
  • Quality score needs review
  • Recent maintenance: 3y since push
  • No real agent outcome reports yet
  • Human review required before unattended installation

Recommended action

Run only in a sandbox and compare close alternatives before using it for real work.

Quality profile

Needs review candidate for agent workflows

Inspect the repository carefully before adding it to an agent workflow.

54
GitHub stars
636
Freshness
3y ago
Install ready
Yes
License
MIT
Review before install: Repository looks stale

Workflow fit

Use this skill in these scenarios

Analyze datasets

Data analysis

I need my agent to analyze CSV data, produce insights, and explain trends.

Manage repositories

GitHub automation

I need my agent to triage GitHub issues, review pull requests, and summarize repository changes.

Build and ship code

Coding agents

I need a coding agent that can understand a repository, edit code, and review pull requests.

Workflow fit

Add it to a complete workflow

Turn skills into distribution

Content growth agent

A workflow for turning newly indexed skills into SEO briefs, social drafts, comparison pages, and reusable publishing workflows.

Inspect, patch, and verify code

Coding review agent

A workflow for software agents that inspect repositories, review pull requests, generate tests, and turn findings into shippable patches.

Ingest, retrieve, and cite

RAG knowledge base

A workflow for document-heavy agents that ingest files, create searchable knowledge, retrieve relevant context, and answer with grounded sources.

Alternative shortlist

Compare before you install

Similar skills that may fit this task.

Compare all

D3

Bring data to life with SVG, Canvas and HTML. :bar_chart::chart_with_upwards_trend::tada:

Adopt
Ready100
Quality100
Stars113.1K

Grafana

The open and composable observability and data visualization platform. Visualize metrics, logs, and traces from multiple sources like Prometheus, Loki, Elasticsearch, InfluxDB, Postgres and many more.

Adopt
Ready100
Quality100
Stars74.4K

Superset

Apache Superset is a Data Visualization and Data Exploration Platform

Adopt
Ready100
Quality100
Stars73.3K

Echarts

Apache ECharts is a powerful, interactive charting and data visualization library for browser

Adopt
Ready100
Quality100
Stars66.6K

Overview

📝 Web-based, reactive Datalog notebooks for data analysis and visualization

Imported by the skill-only GitHub discovery pipeline because it matches agent skill, automation, domain workflow, RAG, document-processing, data, finance, security, or developer-tool signals. Protocol-server projects are excluded from automated imports.

Platform compatibility

rustFULL
data-visualizationFULL

Technical details

Version
1.0.0
License
MIT
Last updated
Jul 10, 2026
Published
Jun 14, 2026

Frameworks & tools

RustData Visualization

Decision snapshot

Needs validation

57
Ready
Review
Stage

636 GitHub stars

Audit

Install review

Install and adoption review

65
Needs review
Security
88/100
Maintenance
20/100
Install
92/100
Open full auditView eval report

Agent-proven evidence

Agent-proven evidence

Outcome reports after resolve, review, install, and one narrow run.

0
Proven
Needs first agent runAuto-install: review firstLast: Unknown
Success rate
—
Recent failure
—
Outcomes
0
Output quality
—
Failed
0
Not relevant
0
Installs
0
Risk blocked
0
Setup needed
0
Production
0

No agent outcome data yet. The first agent run can report success, setup needs, risk blocks, failure, or not-relevant through /api/agent/outcome.

Agent-Proven rankingOutcome contract

Install

Add to agent workflow

Free and open source. Review the report before installing into production agents.

Compare AlternativesAuto-resolve PlanView on GitHubDocumentation

Growth loop

Share kit

X

Scenario-led draft for Percival, ready for a manual X post.

Curator note
A practical pick for a web workflow:

Percival: 📝 Web-based, reactive Datalog notebooks for data analysis and visualization

636 stars

https://www.openagentskill.com/skills/ekzhang-percival?ref=x
Open X draft
Optional reply with install command
Listing + install path for Percival:
https://www.openagentskill.com/skills/ekzhang-percival?ref=x

Install: npx skills add ekzhang/percival
Open reply draft

Listing source

Community indexed

Claimable

This listing was indexed from public sources and is not marked official until a maintainer claim is approved.

Creator
ekzhang
Indexed by
OpenAgentSkill community index

Attribution links to the public repository or creator profile. Creators can claim the listing to update ownership signals.

Claim this skill

Owner claim

Claim this skill listing

This Community indexed listing is attributed to ekzhang but is not marked official yet. Claim it to add a verified owner signal and make future launch, install, and audit updates easier to trust.

Creator backlink kit

Add the evidence badges to your README

Show the canonical listing, current trust and audit signals, and real Agent-Proven evidence where developers evaluate the repository.

[![Listed on OpenAgentSkill](https://www.openagentskill.com/api/badge/ekzhang-percival?metric=listed&label=Listed)](https://www.openagentskill.com/skills/ekzhang-percival)
[![OpenAgentSkill Trust](https://www.openagentskill.com/api/badge/ekzhang-percival?metric=trust&label=Trust)](https://www.openagentskill.com/skills/ekzhang-percival)
[![OpenAgentSkill Audit](https://www.openagentskill.com/api/badge/ekzhang-percival?metric=audit&label=Audit)](https://www.openagentskill.com/skills/ekzhang-percival/audit)
[![Agent Proven](https://www.openagentskill.com/api/badge/ekzhang-percival?metric=proven&label=Agent%20Proven)](https://www.openagentskill.com/skills/ekzhang-percival)
Preview badge Open audit Creator kit

Author

E

ekzhang

@ekzhang

Tags

data-visualizationanalyticsdatachartsdatalogdsllogic-programmingnotebookquery-languagereactive

Platform fit

Claude Code

Health signals

GitHub stars
636
Quality score
38/100
Last GitHub push
Feb 16, 2023
Framework hints
2
OpenAgentSkill views
1
Install copies
0
Outbound clicks
0

Community signal

Share whether this skill looks useful for your agent workflow. Aggregated feedback improves rankings over time.

Trust & safety

Sandbox only

65
  • GitHub adoption636 GitHub starsINFO
  • Stars/forks activity636 stars, 25 forks; issue activity unavailable in current metadataINFO
  • Recent maintenance3y since pushFIX
  • License clarityMITPASS
  • README/SKILL.md completenessPublic metadata needs stronger README/SKILL.md contextINFO
  • Dependency/runtime riskno major dependency risk hints in public metadataPASS

Related skills

D3

Bring data to life with SVG, Canvas and HTML. :bar_chart::chart_with_upwards_trend::tada:

113.1K Stars · 0 Installs

Grafana

The open and composable observability and data visualization platform. Visualize metrics, logs, and traces from multiple sources like Prometheus, Loki, Elasticsearch, InfluxDB, Postgres and many more.

74.4K Stars · 0 Installs

Superset

Apache Superset is a Data Visualization and Data Exploration Platform

73.3K Stars · 0 Installs

Echarts

Apache ECharts is a powerful, interactive charting and data visualization library for browser

66.6K Stars · 0 Installs