navvi-login

navvi-login is a skill for Claude Code, Codex from fellowship-dev/navvi. It costs 49 tokens per session (723 once invoked), scanned A, original, MIT.

A browser-login guide that uses Navvi to fill in stored account details, submit a sign-in form, and verify the result. It sends two-factor authentication or difficult CAPTCHA challenges to the user when needed.

In plain words
What is it for?
Logging into web services, checking whether sign-in succeeded, and escalating 2FA or CAPTCHA steps.
Why use it?
It avoids exposing passwords to the agent while handling the repetitive parts of website sign-in.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Logging into web services, checking whether sign-in succeeded, and escalating 2FA or CAPTCHA steps.

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Install with agentmods
npx agentmods add skills/fellowship-dev/navvi/navvi-login
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 fellowship-dev/navvi --skill navvi-login
Clone the repo
git clone --depth 1 https://github.com/fellowship-dev/navvi

Made for: Claude Code, Codex.

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 navvi-login

README.md
[![agentmods](https://agentmods.dev/badge/skills/fellowship-dev/navvi/navvi-login/github.svg)](https://agentmods.dev/skills/fellowship-dev/navvi/navvi-login)
Your own site
<a href="https://agentmods.dev/skills/fellowship-dev/navvi/navvi-login"><img src="https://agentmods.dev/badge/skills/fellowship-dev/navvi/navvi-login/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 navvi-login

Your own site · 80×15
<a href="https://agentmods.dev/skills/fellowship-dev/navvi/navvi-login"><img src="https://agentmods.dev/badge/skills/fellowship-dev/navvi/navvi-login.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 49 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 723 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.
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 $0.00049 $0.00723
Opus 5 $0.00024 $0.00362
Sonnet 5 $0.00010 $0.00145
Haiku 4.5 $0.00005 $0.00072

Measured 12d ago against content hash e05a16a6c7da, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

navvi-login 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 12d 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.

skills/navvi-login/SKILL.md · 69 lines

How it starts

The opening of the file, as written. The whole thing — 69 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Login automation skill. Logs into a service using stored credentials via Navvi MCP tools.

First Step (ALWAYS)

Read the persona brief — this tells you who you are, your accounts, and credentials:

mcp__navvi__navvi_milestone(action="brief", persona="{persona}")

Prerequisites

  • Navvi container must be running (mcp__navvi__navvi_start)
  • Account must be registered via navvi_account with a creds_ref pointing to gopass

Workflow

Step 1: Use navvi_login (primary method)

mcp__navvi__navvi_login(service="SERVICE_NAME", persona="default")

This handles everything: reads gopass, navigates to login page, autofills credentials, submits, and verifies. Passwords NEVER appear in your context.

Step 2: Verify result

Take a screenshot and Read it to confirm login succeeded:

mcp__navvi__navvi_screenshot()

Step 3: Handle failures

If navvi_login fails or reports issues:

  • 2FA required: call navvi_vnc() and tell the user to complete it manually
  • reCAPTCHA v2: try clicking the checkbox (navvi_find(selector="iframe[title*=reCAPTCHA]")navvi_click) up to 3 times. If an image challenge appears or 3 clicks fail, call navvi_vnc() for human help
  • Other CAPTCHAs (Arkose/FunCaptcha, hCaptcha): call navvi_vnc() — do NOT attempt to solve
  • Non-standard form: unlock atomic tools with navvi_atomic(enable=true), then use navvi_find + navvi_fill for username only. For passwords, use VNC.

Step 4: Record milestone (first login only)

If this is the persona's first login to this service, record it:

mcp__navvi__navvi_milestone(action="add", persona="{persona}", event="First login to {Service}", detail="Logged in as {username}. Landing page: {description of what's visible}.", url="{current_url}", tags="first,{service},login", screenshot=true)

Rules

  • ALWAYS try navvi_login first — only fall back to atomic tools if it fails
  • NEVER type or display passwords
  • For reCAPTCHA v2, try clicking the checkbox first (up to 3 attempts) before escalating to VNC
  • For other CAPTCHAs (Arkose, hCaptcha, image puzzles), escalate to VNC immediately
  • Always screenshot before and after to verify

Read the full file on GitHub · 69 lines

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. 12d ago First seen · 69 lines · 49 tokens per session scan A e05a16a6c7da

Subscribe to this mod's changes

navvi-login is a skill published in the GitHub repository fellowship-dev/navvi (9 stars, last pushed 1mo ago), licensed MIT. It adds 49 tokens to every session and 723 once invoked, about $0.0002 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 2026-08-31.

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