What is add-gcal-tool?

A Google Calendar connection for listing, searching, creating, updating, and deleting events, including free/busy checks. Google Calendar is Google’s scheduling service.

It connects selected agent groups through OneCLI-managed authentication and supports multiple calendars and accounts.

It lets the agent work across calendars without placing real OAuth credentials inside the container.

How taslim/nanoclaw-gws-ea configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to taslim/nanoclaw-gws-ea. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/taslim/nanoclaw-gws-ea/main/.claude/skills/add-gcal-tool/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/taslim/nanoclaw-gws-ea

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/taslim/nanoclaw-gws-ea/add-gcal-tool/github.svg)](https://agentmods.dev/skills/taslim/nanoclaw-gws-ea/add-gcal-tool)

Your own site

<a href="https://agentmods.dev/skills/taslim/nanoclaw-gws-ea/add-gcal-tool"><img src="https://agentmods.dev/badge/skills/taslim/nanoclaw-gws-ea/add-gcal-tool/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/taslim/nanoclaw-gws-ea/add-gcal-tool"><img src="https://agentmods.dev/badge/skills/taslim/nanoclaw-gws-ea/add-gcal-tool.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 67 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,849 The whole file, excluding the scripts and references it only reads on demand.

Security scan D 2 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	$0.00067	$0.02849
Opus 5	$0.00034	$0.01425
Sonnet 5	$0.00013	$0.00570
Haiku 4.5	$0.00007	$0.00285

Measured 12d ago against content hash a6a3438fd276, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade D, and why

add-gcal-tool scanned grade D with 2 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.

Asks for rootmediumPrivilege escalation

A mod that escalates privileges can change anything on the machine, not only the project.

chmod 600 ~/.calendar-mcp/*.json

Recursive force deletehighDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

5. Optional: `rm -rf ~/.calendar-mcp/` and `onecli apps disconnect --provider google-calendar`.

.claude/skills/add-gcal-tool/SKILL.md · 239 lines

How it starts

The opening of the file, as written. The whole thing — 239 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Add Google Calendar Tool (OneCLI-native)

This skill wires @cocal/google-calendar-mcp into selected agent groups. The MCP server reads stub credentials containing the onecli-managed placeholder; the OneCLI gateway intercepts outbound calls to calendar.googleapis.com / oauth2.googleapis.com and swaps the bearer for the real OAuth token from its vault.

Why this package (and not gongrzhe's): @gongrzhe/server-calendar-autoauth-mcp only supports the primary calendar and exposes 5 tools (no list_calendars). @cocal/google-calendar-mcp explicitly supports multi-calendar and multi-account, and is actively maintained.

Tools exposed (surfaced as mcp__calendar__<name>, exact set depends on version — run tools/list against the MCP server to enumerate): list-calendars, list-events, search-events, create-event, update-event, delete-event, get-event, list-colors, get-freebusy, get-current-time, plus multi-account management tools.

Why this pattern: v2's invariant is that containers never receive raw API keys (CHANGELOG 2.0.0). Same stub pattern /add-gmail-tool uses. This skill is deliberately a sibling, not a combined "Google Workspace" skill — installs independently and removes cleanly.

Phase 1: Pre-flight

Verify OneCLI has Google Calendar connected

onecli apps get --provider google-calendar

Expected: "connection": { "status": "connected" } with scopes including calendar.readonly and calendar.events.

If not connected, tell the user:

Open the OneCLI web UI at http://127.0.0.1:10254, go to Apps → Google Calendar, and click Connect. Sign in with the Google account the agent should act as. calendar.readonly + calendar.events are the minimum useful scopes.

Verify stub credentials exist

The stub lives at ~/.calendar-mcp/ by convention (shared with /add-gmail-tool's sibling). cocal doesn't default to this path (it uses ~/.config/google-calendar-mcp/tokens.json) — we override via env vars below so it reads our stubs instead.

Read the full file on GitHub · 239 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.

12d ago First seen · 239 lines · 67 tokens per session scan D a6a3438fd276

Subscribe to this mod's changes

add-gcal-tool is a skill published in the GitHub repository taslim/nanoclaw-gws-ea (11 stars, last pushed 3mo ago), licensed MIT. It adds 67 tokens to every session and 2,849 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it D with 2 findings (asks for root, recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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nanoclaw-gws-ea: Skill for Claude Code