An unofficial integration for Brazil’s 99 passenger ride service, covering 99Pop and 99Moto. It can provide fare estimates, ride history, and ride tracking, but requesting a ride is restricted by safety checks.

Use it to estimate fares, compare car and motorcycle rides, review ride history, track a ride, or request a ride when the required safeguards allow it.

It lets you check ride information without opening the 99 app, while keeping ride requests behind explicit safeguards.

ninenine — Skill for Claude Code and Codex by davidmosiah

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 davidmosiah/ninenine-mcp --skill skill

Clone the repo

git clone --depth 1 https://github.com/davidmosiah/ninenine-mcp

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/davidmosiah/ninenine-mcp/skill/github.svg)](https://agentmods.dev/skills/davidmosiah/ninenine-mcp/skill)

Your own site

<a href="https://agentmods.dev/skills/davidmosiah/ninenine-mcp/skill"><img src="https://agentmods.dev/badge/skills/davidmosiah/ninenine-mcp/skill/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/davidmosiah/ninenine-mcp/skill"><img src="https://agentmods.dev/badge/skills/davidmosiah/ninenine-mcp/skill.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 93 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 642 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.

Model	Per session	Once invoked
Fable 5.1	$0.00093	$0.00642
Opus 5	$0.00046	$0.00321
Sonnet 5	$0.00019	$0.00128
Haiku 4.5	$0.00009	$0.00064

Measured 4d ago against content hash 2e6b6b99e8d7, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

ninenine 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 4d 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.

skill/SKILL.md · 59 lines

What it actually says

99 — skill or MCP

Unofficial. Not 99Food, 99Pay, 99Entrega, or corp B2B.

Same binary either way. Mutation gates live in the server, not in this file.

Choose a surface

MCP — tools appear natively after stdio/HTTP config:

{ "mcpServers": { "ninenine": { "command": "npx", "args": ["-y", "ninenine-mcp-unofficial"] } } }

Do not put mutation flags in that snippet.

Skill / CLI — no MCP client required. Same tools:

npx -y ninenine-mcp-unofficial doctor --json
npx -y ninenine-mcp-unofficial call ninenine_capabilities --json '{}'
npx -y ninenine-mcp-unofficial call ninenine_estimate --json '{"from_lat":-3.73,"from_lng":-38.52,"to_lat":-3.74,"to_lng":-38.54}'

If MCP tools named ninenine_* are already available, use them. Do not also shell out.

Setup (once)

npx -y ninenine-mcp-unofficial setup
npx -y ninenine-mcp-unofficial auth --from-header "Bearer …"

Token is a captured passenger Authorization to api.99taxis.mobi, stored at ~/.ninenine-mcp/tokens.json (0600). Estimates work without a token; request-ride stays blocked.

Loop

ninenine_connection_status (or doctor --json). Expect unofficial and never_pays_by_default.
ninenine_estimate with origin/destination. Always show 99Pop and 99Moto with price/ETA. Optional ninenine_multi_estimate. Never request a car.
History / track only if asked. GPS, street, phone stay redacted.
Stop. Do not call ninenine_request_ride or ninenine_cancel_ride unless the user clearly asked to request/cancel this ride. If the tool returns USER_ACTION_REQUIRED, report that and stop. Do not invent env flags.

Never

Enable mutations from this skill
Paste tokens into git, chat logs, or the prompt
Treat guest as able to pay
Open 99Food

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.

4d ago Changed 2e6b6b99e8d7
8d ago First seen · 59 lines · 93 tokens per session scan A 56ec8232abb3

Subscribe to this mod's changes

ninenine is a skill published in the GitHub repository davidmosiah/ninenine-mcp (1 stars, last pushed 7d ago), licensed MIT. It adds 93 tokens to every session and 642 once invoked, about $0.0005 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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Use when encountering any bug, test failure, or unexpected behavior, before proposing fixes.

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