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 guanyang/open-agent-hub --skill latent-briefinggit clone --depth 1 https://github.com/guanyang/open-agent-hubWrote 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/guanyang/open-agent-hub/latent-briefing)<a href="https://agentmods.dev/skills/guanyang/open-agent-hub/latent-briefing"><img src="https://agentmods.dev/badge/skills/guanyang/open-agent-hub/latent-briefing/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/guanyang/open-agent-hub/latent-briefing"><img src="https://agentmods.dev/badge/skills/guanyang/open-agent-hub/latent-briefing.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 | $0.00074 | $0.02570 |
| Opus 5 | $0.00037 | $0.01285 |
| Sonnet 5 | $0.00015 | $0.00514 |
| Haiku 4.5 | $0.00007 | $0.00257 |
Grade A, and why
latent-briefing 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 8d 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.
This is a copy
100% identical to latent-briefing — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 168 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Latent Briefing and KV Cache Memory Sharing
Hierarchical multi-agent systems often pay for the same context twice. The orchestrator accumulates a long reasoning trajectory, but each worker usually receives only a narrow text handoff such as a subtask prompt plus raw document slices. Passing the full trajectory fixes coverage but drives token cost up on every worker call. Summarization introduces latency and information loss. Retrieval helps with document access but does not preserve the orchestrator's evolving reasoning state.
Latent Briefing addresses this by sharing memory at the representation level rather than the text level. The core idea is to compact the orchestrator trajectory in the worker model's KV cache, keeping positions that are most relevant to the current worker task. The method builds on Attention Matching (AM) KV cache compaction and adapts it for inference-time multi-agent handoff with task-guided queries, a shared token mask across heads, and robust thresholding.
When to Activate
Activate this skill when:
- Designing orchestrator-worker or supervisor-specialist systems where workers need access to prior orchestrator state without replaying the full trajectory as text
- Evaluating alternatives to LLM summarization or RAG for cross-agent state transfer
- Implementing or studying KV cache compaction as a first-class inference primitive, not only prefix caching of identical prompts
- Debugging token explosion in recursive, hierarchical, or tool-heavy agent graphs
- Interpreting benchmarks that report worker-token savings, total-token savings, compaction overhead, and accuracy together
Do not activate this skill for adjacent work owned by other skills:
- API-only stacks where internal KV tensors are inaccessible: use
context-compression,memory-systems, ormulti-agent-patterns. - Ordinary persistent memory, entity tracking, or graph retrieval:
memory-systems. - General multi-agent topology without representation-level state sharing:
multi-agent-patterns. - Prefix caching, masking, or budget policy that does not transform KV state:
context-optimization.
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 8d ago First seen · 168 lines · 74 tokens per session scan A d84e7abe51f0
latent-briefing is a skill published in the GitHub repository guanyang/open-agent-hub (967 stars, last pushed today), licensed MIT. It adds 74 tokens to every session and 2,570 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to latent-briefing, differing in 0 lines, and is treated as a copy.
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