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.
npx skills add navendubrajesh/context-management-for-agents --skill antigravity-session-managementgit clone --depth 1 https://github.com/navendubrajesh/context-management-for-agentsWrote 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.
[](https://agentmods.dev/skills/navendubrajesh/context-management-for-agents/antigravity-session-management)<a href="https://agentmods.dev/skills/navendubrajesh/context-management-for-agents/antigravity-session-management"><img src="https://agentmods.dev/badge/skills/navendubrajesh/context-management-for-agents/antigravity-session-management/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.
<a href="https://agentmods.dev/skills/navendubrajesh/context-management-for-agents/antigravity-session-management"><img src="https://agentmods.dev/badge/skills/navendubrajesh/context-management-for-agents/antigravity-session-management.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00091 | $0.00859 |
| Opus 5 | $0.00046 | $0.00430 |
| Sonnet 5 | $0.00018 | $0.00172 |
| Haiku 4.5 | $0.00009 | $0.00086 |
Grade A, and why
antigravity-session-management 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 11d 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.
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.
How it starts
The opening of the file, as written. The whole thing — 78 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Antigravity Session Management
Antigravity sessions span Editor chats and Manager-orchestrated async agents. Durability comes from Artifacts and Knowledge Items, not verbatim chat. This skill covers keeping long agent-first work coherent across sessions and agent instances.
When to Activate
Activate this skill when:
- Manager Surface agents produce Artifacts that need review before the next phase
- Knowledge Items contain outdated facts misleading new sessions
- Deciding whether to continue an async agent run or spawn a fresh one
- Multi-agent workflows produce conflicting Artifacts or plans
- Editor sessions lose alignment with Manager-generated plans
Do not activate this skill for adjacent work owned by other skills:
- Do not activate for writing AGENTS.md or skills:
antigravity-customization. - Do not activate for context pillar overview:
antigravity-context-architecture. - Do not activate for CLI-style
/compactworkflows:copilot-session-management. - Do not activate for platform-agnostic summarization:
context-compression.
Core Concepts
Artifacts as session checkpoints
Each significant agent phase should produce a reviewable Artifact (plan, task list, walkthrough). Treat approved Artifacts as checkpoints — the Manager Surface equivalent of compaction summaries, but human-reviewable and editable.
Knowledge Item hygiene
KIs persist indefinitely. Stale KIs cause confident wrong behavior. Schedule KI audits when: APIs change, architecture pivots, or Artifacts supersede earlier assumptions. Delete or update — don't accumulate contradictory KIs.
Manager Surface handoffs
When delegating end-to-end tasks:
- Agent generates Artifacts for verification
- Human comments on Artifact (not raw tool logs)
- Agent continues with feedback incorporated
- Approved Artifacts become reference for downstream agents
Fresh agent vs continue
Continue when: Artifact state is current, KIs accurate, and the next task is a logical extension.
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.
- 11d ago First seen · 78 lines · 91 tokens per session scan A b8bdf355d572
antigravity-session-management is a skill published in the GitHub repository navendubrajesh/context-management-for-agents (2 stars, last pushed 2mo ago), licensed MIT. It adds 91 tokens to every session and 859 once invoked, about $0.0005 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 2026-08-31.
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