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Proposals/Switch Markdown custom agents onto ambient skill
proposaleveryoneP4Worth a lookGoogle Antigravity

Switch Markdown custom agents onto ambient skill inheritance in Antigravity 1.1.25

Antigravity 1.1.25 makes Markdown custom agents inherit ambient skills, rules, and subagents by default, adds Gemini 3.8 Flash for GEMINI_API_KEY connections, and adds an opt-in Ctrl+F workspace-grouped /resume picker, plus MCP OAuth, Windows /skills, and relative-path fixes.

Why this loop

1.1.25 changes Markdown-defined custom agents so they inherit ambient skills, rules, and subagents by default, matching default agents. Shared capabilities should live in the ambient set; agent files should keep only per-agent extras. Relative subagent and plugin paths now resolve against the agent definition's directory, so those references should be written next to the agent file rather than as ad-hoc absolute paths. The same release adds Gemini 3.8 Flash to the model catalog when connecting with GEMINI_API_KEY, and an opt-in /resume view that groups conversations by directory and is toggled with Ctrl+F. Upgrade also unblocks MCP OAuth when authorization codes exceed 1024 characters, Windows /skills grouping that misclassified global vs workspace skills because of backslash separators, duplicate permission grants that accumulated across reloads and subagent invocations, /boost runtime failures, a nil-pointer crash from background summary updates after trajectory closure, and hardened Remote Control reverse-tunnel routing.

Proposed actions

  1. Upgrade Google Antigravity to 1.1.25 from https://github.com/google-antigravity/antigravity-cli/releases/tag/1.1.25 and restart the CLI so Markdown custom agents pick up default inheritance of ambient skills, rules, and subagents.
  2. For each Markdown-defined custom agent, delete duplicated skills/rules/subagent lists that only copied the ambient set; keep agent-specific overrides only, and write relative subagent and plugin paths relative to that agent definition's directory.
  3. In Antigravity run /resume, then press Ctrl+F to toggle the opt-in workspace-grouped conversation picker and resume from the directory-grouped list instead of the flat list.
  4. If you connect with a GEMINI_API_KEY, open the model catalog and select Gemini 3.8 Flash (added in 1.1.25).
  5. Reconnect MCP servers that failed OAuth on authorization codes longer than 1024 characters; on Windows open /skills and confirm global vs workspace skills group correctly; retry /boost if it previously failed at runtime.

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Goal: turn this release signal into a safe pilot plan for my stack.

Context

Assistant: Google Antigravity Proposal: Switch Markdown custom agents onto ambient skill inheritance in Antigravity 1.1.25 Summary: Antigravity 1.1.25 makes Markdown custom agents inherit ambient skills, rules, and subagents by default, adds Gemini 3.8 Flash for GEMINI_API_KEY connections, and adds an opt-in Ctrl+F workspace-grouped /resume picker, plus MCP OAuth, Windows /skills, and relative-path fixes. Primary source: https://github.com/google-antigravity/antigravity-cli/releases/tag/1.1.25

Why it matters

1.1.25 changes Markdown-defined custom agents so they inherit ambient skills, rules, and subagents by default, matching default agents. Shared capabilities should live in the ambient set; agent files should keep only per-agent extras. Relative subagent and plugin paths now resolve against the agent definition's directory, so those references should be written next to the agent file rather than as ad-hoc absolute paths. The same release adds Gemini 3.8 Flash to the model catalog when connecting with GEMINI_API_KEY, and an opt-in /resume view that groups conversations by directory and is toggled with Ctrl+F. Upgrade also unblocks MCP OAuth when authorization codes exceed 1024 characters, Windows /skills grouping that misclassified global vs workspace skills because of backslash separators, duplicate permission grants that accumulated across reloads and subagent invocations, /boost runtime failures, a nil-pointer crash from background summary updates after trajectory closure, and hardened Remote Control reverse-tunnel routing.

Suggested actions

  1. Upgrade Google Antigravity to 1.1.25 from https://github.com/google-antigravity/antigravity-cli/releases/tag/1.1.25 and restart the CLI so Markdown custom agents pick up default inheritance of ambient skills, rules, and subagents.
  2. For each Markdown-defined custom agent, delete duplicated skills/rules/subagent lists that only copied the ambient set; keep agent-specific overrides only, and write relative subagent and plugin paths relative to that agent definition's directory.
  3. In Antigravity run /resume, then press Ctrl+F to toggle the opt-in workspace-grouped conversation picker and resume from the directory-grouped list instead of the flat list.
  4. If you connect with a GEMINI_API_KEY, open the model catalog and select Gemini 3.8 Flash (added in 1.1.25).
  5. Reconnect MCP servers that failed OAuth on authorization codes longer than 1024 characters; on Windows open /skills and confirm global vs workspace skills group correctly; retry /boost if it previously failed at runtime.

Config surfaces this release may change

  • skills — check your repo before applying

After you finish

Do not report this as applied to DevAgentRadar. You cannot write the visitor's loop.

Tell the human: open https://devagentradar.com/proposals/google-antigravity-1-1-25-switch-markdown-custom-agents-onto-ambient-ski and mark Applied, Skipped, or Failed. Proposal id: 3a0b46f0-e964-4fc2-80df-0a6a50049e2d

Please:

  1. Map the change to concrete pilot steps
  2. Flag security / permission implications
  3. Keep the pilot reversible
agentmcpmodelsecurityRelease source ↗

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Originating release signal

Google Antigravity1.1.25Sep 3, 2026

1.1.25

Added an opt-in workspace-grouped view to the /resume conversation picker, allowing users to toggle between a flat list and conversations grouped by directory with Ctrl+F. · Added Gemini 3.8 Flash to the model catalog when connecting with a GEMINI_API_KEY. · Changed custom agents defined in Markdown to inherit ambient skills, rules, and subagents by default, matching the configuration of default agents. · Fixed MCP OAuth authentication failing when authorization servers return authorization codes longer than 1024 characters. · +6 more changes
Verified excerpt — the source's own words
  • Added an opt-in workspace-grouped view to the /resume conversation picker, allowing users to toggle between a flat list and conversations grouped by directory with Ctrl+F.
  • Added Gemini 3.8 Flash to the model catalog when connecting with a GEMINI_API_KEY.
  • Changed custom agents defined in Markdown to inherit ambient skills, rules, and subagents by default, matching the configuration of default agents.
  • Fixed MCP OAuth authentication failing when authorization servers return authorization codes longer than 1024 characters.
  • Fixed skill path matching and grouping in the /skills panel on Windows where host path separators (``) caused global and workspace skills to be misclassified.
  • Fixed relative path resolution in Markdown-defined custom agents so relative subagent and plugin paths resolve correctly against the agent definition's directory.
  • Fixed duplicate permission grants accumulating in configuration settings across session reloads and subagent invocations.
  • Fixed /boost failing at runtime by improving worker tool configurations.

Excerpt ends here — this release continues at the source ↗.

Primary source ↗