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mcp-mobbin

mcp-mobbin is a skill for Claude Code from MichelKerkmeester/skilled-agent-harness_spec-driven-loops. It costs 34 tokens per session (6,811 once invoked), scanned A, original, MIT.

A read-only connector for searching Mobbin, a library of real app interface screenshots. It sends searches for apps, screens, user flows, and interface elements through an agent.

In plain words
What is it for?
Use it for visual interface research before designing or building an app.
Why use it?
It helps an agent find concrete examples of how real products handle interface patterns and multi-step journeys.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

not rated 41repo +1 changed 3d ago A scan SkillSpector: warn 34 tokens original MIT

Good fit Use it for visual interface research before designing or building an app.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/michelkerkmeester/skilled-agent-harness_spec-driven-loops/mcp-mobbin
View source ↗ MichelKerkmeester/skilled-agent-harness_spec-driven-loops
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 MichelKerkmeester/skilled-agent-harness_spec-driven-loops --skill mcp-mobbin
Clone the repo
git clone --depth 1 https://github.com/MichelKerkmeester/skilled-agent-harness_spec-driven-loops

Made for: Claude Code.

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.

agentmods badge for mcp-mobbin

README.md
[![agentmods](https://agentmods.dev/badge/skills/michelkerkmeester/skilled-agent-harness_spec-driven-loops/mcp-mobbin/github.svg)](https://agentmods.dev/skills/michelkerkmeester/skilled-agent-harness_spec-driven-loops/mcp-mobbin)
Your own site
<a href="https://agentmods.dev/skills/michelkerkmeester/skilled-agent-harness_spec-driven-loops/mcp-mobbin"><img src="https://agentmods.dev/badge/skills/michelkerkmeester/skilled-agent-harness_spec-driven-loops/mcp-mobbin/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.

agentmods 80×15 button for mcp-mobbin

Your own site · 80×15
<a href="https://agentmods.dev/skills/michelkerkmeester/skilled-agent-harness_spec-driven-loops/mcp-mobbin"><img src="https://agentmods.dev/badge/skills/michelkerkmeester/skilled-agent-harness_spec-driven-loops/mcp-mobbin.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 34 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 6,811 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 8 findings, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • medium MCP Rug Pull · line 4
    npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.
    Fix: Pin the version: npx @scope/[email protected]
  • medium Data Exfiltration · line 288
    Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.
    Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
  • medium Data Exfiltration · line 374
    Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.
    Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
  • medium Data Exfiltration · line 388
    Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.
    Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
  • medium MCP Rug Pull · line 288
    npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.
    Fix: Pin the version: npx @scope/[email protected]
  • medium MCP Rug Pull · line 388
    npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.
    Fix: Pin the version: npx @scope/[email protected]
  • medium Excessive Agency · line 299
    Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.
    Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
  • medium MCP Rug Pull · line 376
    npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.
    Fix: Pin the version: npx @scope/[email protected]
How audits are shown
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00034 $0.06811
Opus 5.5 $0.00014 $0.02724
Sonnet 5.5 $0.00007 $0.01362
Haiku 4.5 $0.00003 $0.00681

Measured 3d ago against content hash 702ad89dd3a7, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mcp-mobbin 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 3d ago.

The scan reads SKILL.md. This mod also ships 2 executable files (scripts/doctor.sh, scripts/install.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.

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.

.skilled/skills/mcp-tooling/mcp-mobbin/SKILL.md · 305 lines

How it starts

The opening of the file, as written. The whole thing — 305 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Mobbin (mcp-mobbin)

Search Mobbin's library of real app UI screenshots. The official repo calls it "the world's largest library of real app UI screenshots". An agent can query it through the Mobbin MCP via Code Mode. Its documented tool is search_screens, which answers app, screen, flow and element research as query intents. This packet is a read-only TRANSPORT (packetKind: transport, mutatesWorkspace: false). Every call goes to the external hosted Mobbin service, never this repo. It produces no design tokens or Style Reference of its own. If you also want a measured Style Reference of real, extracted design tokens, pair it with sk-design-md-generator. Deep operational detail lives in references/tool-surface.md and references/mcp-wiring.md.

Discovery status (read first). The mobbin Code Mode manual IS REGISTERED in this repo's .utcp_config.json. An operator registered it on 2026-07-16. This packet never edits the config.

Live discovery RAN 2026-07-16, pre-auth (fixture: references/discovery-fixture-2026-07-16.json). list_tools returned THREE read tools. Registry names are mobbin.mobbin.{search_screens,search_flows,search_sections} (dot-separated). The fixture's Access as: lines show TypeScript callables such as mobbin.mobbin_search_screens(...). This supersedes the research's one-public-tool baseline.

Operator browser OAuth is still pending for CALLS. Per-session tool_info re-confirmation is MANDATORY before relying on any name. Confirm, then call. Fail closed on drift.

Access trap. Mobbin MCP access is documented for Pro, Team, and Enterprise — not Free. Authentication is browser OAuth only (DCR + PKCE S256, openid scope): no static API key or auth env var exists for MCP — that question is answered in the negative, not open. Unauthenticated calls return HTTP 401. The service is rate-limited to 60 requests per 60 seconds per user.

Read the full file on GitHub · 305 lines

Files

What ships with it

49 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.

  1. 3d ago Changed · -5 lines 702ad89dd3a7
  2. 7d ago Changed · -3 lines 39d1ce1e40c4
  3. 12d ago Changed · -164 lines 6cd49245322b
  4. 13d ago Changed · +55 lines cfd5b71524f0
  5. 26d ago Changed 7fead79c58fc
  6. 1mo ago Changed · -7 tokens per session 65367959a5c4
  7. 1mo ago Changed e12e37277087
  8. 1mo ago Changed 3eb088eaef41
  9. 1mo ago Changed · +5 lines 76599d0708e7
  10. 2mo ago First seen · 417 lines · 41 tokens per session scan A d1dea40d6af6

Subscribe to this mod's changes

mcp-mobbin is a skill published in the GitHub repository MichelKerkmeester/skilled-agent-harness_spec-driven-loops (41 stars, last pushed yesterday), licensed MIT. It adds 34 tokens to every session and 6,811 once invoked, about $0.0001 per session on Opus 5.5. 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 2026-09-03.

Design and UXResearch
Related

mcp-mobbin compared with skills from other repositories

mcp-mobbin next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
mcp-mobbinMichelKerkmeester/skilled-agent-harness_spec-driven-loopsSkill41yesterdayMITA34Claude Code
webgl-holographic-foilnexu-io/open-designSkill107ktodayApache-2.0A41Claude Code, Codex
html-ppt-hermes-cyber-terminalnexu-io/open-designSkill107ktodayApache-2.0A53Claude Code, Codex
html-ppt-taste-brutalistnexu-io/open-designSkill107ktodayApache-2.0A78Claude Code, Codex
visual-ralphYeachan-Heo/oh-my-codexSkill34kyesterdayMITA52Codex
glance-canonical-layoutsandroid/skillsSkill10kyesterdayApache-2.0A56Claude Code
accessibilitymicrosoft/hve-coreSkill1.6ktodayMITA47Claude Code