Your Gemini Gem Is Becoming a Skill. Here’s What Won’t Carry Over.

Evidence-based analysis. Documentation checked November 8, 2026. We have not tested the migration in a live account.

If you use Gemini Gems on a personal Google account and are 18 or over, they stop working on November 17, 2026. Google’s transition FAQ Google plans to convert ordinary Gems automatically. Skills announcement A low-stakes, instruction-only Gem can reasonably wait for that move and a check afterward. Anything built around important files or a particular tool deserves attention now: save its ingredients and rehearse the job you depend on.

Skills bring reusable instructions into normal chats, where Google says Gemini can select relevant ones and combine several. A writing-style Skill and a report-formatting Skill could work together without separate Gem conversations. How Google describes Skills

Consider a Gem that turns notes into a weekly report using an attached template. You need its replacement to find that template, follow its headings and handle missing information honestly. Those are the results to check.

First, check which deadline applies

For personal accounts, age 18 or over:

• November 17, 2026: Gems become read-only, with use, editing and creation disabled.
• December 17, 2026: Gems and their files become inaccessible in Gemini Apps.

Save important files now; use that gap to retrieve anything you missed. Under-18 personal accounts transition later, on an unannounced date. Transition timetable

Personal-account Skills require sign-in and Keep Activity enabled. Chat Skills do not require a paid Google AI subscription. Requirements If you deliberately keep activity off, read the privacy trade-off below before deciding to use the replacement.

Work and school (Google Workspace) accounts have more time. Gems move to Settings on November 17 and remain usable. Retirement is no sooner than March 1, 2027 for business and enterprise, and no sooner than June 1, 2027 for education. Workspace timetable Google separately lists nonprofits for March 2027. Announcement

Check files and tools separately

Automatic migration drops the largest files first to fit its 100 MB limit; GitHub files are excluded. Migration limits Choose essential sources yourself rather than letting size decide their importance.

The Skills manual supports .docx, .xlsx and .pptx, PDF, text and supported images. Exclusions include older .doc, .xls and .ppt, audio, video, archives, .raw images and code/data formats such as .ts, .php, .swift and .sql. Check the full list; these examples are not exhaustive. A ZIP packaging a Skill is distinct from an archive used as reference material.

Check extensions before converting a folder. Keep the originals and inspect converted copies, especially tables. A document that opens successfully can still be an inadequate source if a conversion changes its structure or leaves out material your instructions expect.

Unsupported Gem default tools include video/music creation, Canvas, Deep Research and Guided Learning. Tool limits Plan where any dependent step will happen, and preserve useful outputs. Google’s October 13 notice describes Skill sharing as forthcoming, so check whether your account can share the replacement before others rely on it.

Give your most useful Gem a small rehearsal

Start with the Gem whose failure would interrupt something. You do not need to rebuild every experiment in the sidebar.

1. Save a working reference. Keep the Gem’s name, description, instructions and essential sources together. In its desktop edit view, open each Knowledge file and select Download, one at a time. Google’s preservation procedure

Save one representative input and an output you consider acceptable, and note what you normally correct by hand. That gives you a specific comparison: the required headings, a source detail that must survive and the limits of what Gemini should infer.

2. Recreate it if you need confidence before the deadline. On the desktop web app, use Customize → Skills → Create → Create manually. Paste the name, description and instructions, then create the Skill. Gemini reformats the name into lowercase, hyphenated form, such as weekly-report. The manual shows Add options for device files, Drive, Photos and notebooks, but also retains upload-and-replace wording. The transition FAQ still calls Drive/notebook support forthcoming. Check your account’s controls.

If Add is unavailable, follow Google’s desktop file procedure: download the new Skill’s ZIP, extract SKILL.md into a folder with your supported files within the 100 MB limit, name that folder exactly as the reformatted Skill name, then use Replace skill → folder → Upload.

Once a Skill exists, its ZIP export omits linked Drive files and notebooks. Export limits Record those sources separately rather than treating the download as a complete backup.

3. Check the result against the job. Run your representative input and inspect:

• Did it use the relevant source, including a detail you can independently verify?
• Did it keep the required structure and constraints?
• Did it ask about missing information rather than invent an answer?
• Can you still complete any tool-dependent step?

For the weekly-report example, deliberately leave one status missing. The useful outcome is a request for clarification or an explicit gap, according to your instructions. A polished report containing a fabricated status fails the check.

Also try the task without explicitly selecting the Skill. Google says its name and description determine relevance before the instructions load. Give the description a concrete use case and check whether Gemini recognizes it. How Skills are selected

One successful attempt is a starting check, not proof of reliability. Repeat important exceptions. If the replacement misses something, change one instruction or source at a time so you can tell what helped.

Check the privacy trade-off

Keep Activity saves chats and uploads in activity. Google uses that activity to improve services, including model training with human review, and warns against entering confidential information you would not want reviewed or used that way. Gemini Apps Privacy Hub

Do not change a deliberate privacy choice just to expose a feature. Use nonconfidential examples for the rehearsal, and decide whether the required setting fits the information your Gem handles. These personal-account terms should not be assumed to describe your organization’s Workspace arrangement.

Two cases need a different plan

Workspace: Migrated Skills will be inactive drafts requiring creator review and activation; sharing permissions are intended to transfer. Gemini-app and Workspace-app Skills do not currently sync. Workspace Studio flows containing Ask a Gem stop working at retirement, so their owners need to replace that step. Workspace guidance

The October 13 notice expects Gemini-app rollout to finish by mid-November, while Skills inside Workspace apps are delayed until further notice. The admin guide still shows the earlier rollout schedule. Updated rollout notice

Opal and Gems made by Labs: These shut down on November 17 without automatic migration. Their workflow files remain in Drive’s Opal folder and prompt text can be retrieved afterward, but interactive execution ends. Opal FAQ Copy the prompts and record the steps of any mini-app you depend on. Preserved files will not keep the service running.

Choosely’s verdict

Spend your effort on the parts that would be difficult to reconstruct: essential source material, tool-dependent steps and examples of acceptable work. Judge the replacement against those examples before relying on it. A familiar name in the sidebar is a poor acceptance test.