gws-gmail-reply

A command-line skill for replying to a Gmail message while keeping the response in the existing email conversation.

In plain words
What is it for?
Use it to send a plain-text or HTML reply, add recipients or attachments, choose a sender alias, preview the request, or save the reply as a draft.
Why use it?
It removes the need to open Gmail and manually manage the conversation when an automated task needs to answer an email.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/googleworkspace/cli/gws-gmail-reply
Any agent
npx skills add googleworkspace/cli --skill gws-gmail-reply
Clone the repo
git clone --depth 1 https://github.com/googleworkspace/cli

Made for: Claude Code, Codex.

Per session 19 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 779 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00019 $0.00779
Opus 5 $0.00010 $0.00390
Sonnet 5 $0.00004 $0.00156
Haiku 4.5 $0.00002 $0.00078

Measured yesterday against content hash 0b453c4ec1b9, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

gws-gmail-reply 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 yesterday.

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.

Origin

Copies of this mod

3 near-identical copies found in the catalogue:

skills/gws-gmail-reply/SKILL.md · 67 lines

How it starts

The opening of the file, as written. The whole thing — 67 lines — stays where its author put it; the contents beside it link to each section on GitHub.

gmail +reply

PREREQUISITE: Read ../gws-shared/SKILL.md for auth, global flags, and security rules. If missing, run gws generate-skills to create it.

Reply to a message (handles threading automatically)

Usage

gws gmail +reply --message-id <ID> --body <TEXT>

Flags

Flag Required Default Description
--message-id Gmail message ID to reply to
--body Reply body (plain text, or HTML with --html)
--from Sender address (for send-as/alias; omit to use account default)
--to Additional To email address(es), comma-separated
--attach Attach a file (can be specified multiple times)
--cc CC email address(es), comma-separated
--bcc BCC email address(es), comma-separated
--html Treat --body as HTML content (default is plain text)
--dry-run Show the request that would be sent without executing it
--draft Save as draft instead of sending

Examples

gws gmail +reply --message-id 18f1a2b3c4d --body 'Thanks, got it!'
gws gmail +reply --message-id 18f1a2b3c4d --body 'Looping in Carol' --cc [email protected]
gws gmail +reply --message-id 18f1a2b3c4d --body 'Adding Dave' --to [email protected]
gws gmail +reply --message-id 18f1a2b3c4d --body '<b>Bold reply</b>' --html
gws gmail +reply --message-id 18f1a2b3c4d --body 'Updated version' -a updated.docx
gws gmail +reply --message-id 18f1a2b3c4d --body 'Draft reply' --draft

Tips

  • Automatically sets In-Reply-To, References, and threadId headers.
  • Quotes the original message in the reply body.
  • --to adds extra recipients to the To field.
  • Use -a/--attach to add file attachments. Can be specified multiple times.
  • With --html, the quoted block uses Gmail's gmail_quote CSS classes and preserves HTML formatting. Use fragment tags (, , , etc.) — no / wrapper needed.
  • With --html, inline images in the quoted message are preserved via cid: references.
  • Use --draft to save the reply as a draft instead of sending it immediately.
  • For reply-all, use +reply-all instead.

Read the full file on GitHub · 67 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. yesterday First seen · 67 lines · 19 tokens per session scan A 0b453c4ec1b9

Subscribe to this mod's changes

gws-gmail-reply is a skill published in the GitHub repository googleworkspace/cli (30,651 stars, last pushed 6d ago), licensed Apache-2.0. It adds 19 tokens to every session and 779 once invoked, about $0.0001 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 2026-08-30.