feat(graveyard): add Project Mariner

[mkondratek]

Add Project Mariner to the graveyard

Project Mariner — Google DeepMind's research-prototype web-browsing AI agent — was discontinued on May 4, 2026. It's not currently in graveyard.json, so this PR adds it.

Entry

Field	Value
name	Project Mariner
dateOpen	2024-12-11 (initial release as a research prototype)
dateClose	2026-05-04
type	service
link	https://en.wikipedia.org/wiki/Project_Mariner

Description

Project Mariner was a research prototype AI agent by Google DeepMind that could browse the web on a user's behalf to perform tasks like online shopping, information retrieval, and form-filling.

Sources

• Wikipedia — Project Mariner: https://en.wikipedia.org/wiki/Project_Mariner
  • Confirms launch (Dec 11, 2024) and discontinuation (May 4, 2026); categorized under Discontinued Google services.
• Original announcement / labs page (Google-hosted, may be removed): https://labs.google.com/mariner/landing
• DeepMind product page (Google-hosted, may be removed): https://deepmind.google/models/project-mariner/
• Coverage of the 2025 rollout (context):
  • TechCrunch — "Google rolls out Project Mariner, its web-browsing AI agent" (May 20, 2025)
  • The Verge — "Google is bringing an 'Agent Mode' to the Gemini app" (May 20, 2025)

Per the contributing guide I avoided linking to Google-owned URLs as the primary source since those tend to disappear shortly after a product is killed; Wikipedia is used instead.

Checklist

• Entry follows the schema (name / dateOpen / dateClose / link / description / type)
• type is one of app / service / hardware (chose service — it was a cloud-hosted AI agent; the Chrome extension was just the delivery surface)
• Description is a single past-tense sentence beginning with the product name
• Link is not a Google-owned URL
• Dates are valid yyyy-mm-dd, dateClose is after dateOpen
• Name is unique (no existing "Mariner" entry)

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Project	Deployment	Actions	Updated (UTC)
killedbygoogle	Ready	Preview	May 22, 2026 10:09am