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 Mark393295827/third-brain-v7-skills --skill context-managergit clone --depth 1 https://github.com/Mark393295827/third-brain-v7-skillsWrote 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/mark393295827/third-brain-v7-skills/context-manager)<a href="https://agentmods.dev/skills/mark393295827/third-brain-v7-skills/context-manager"><img src="https://agentmods.dev/badge/skills/mark393295827/third-brain-v7-skills/context-manager/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/mark393295827/third-brain-v7-skills/context-manager"><img src="https://agentmods.dev/badge/skills/mark393295827/third-brain-v7-skills/context-manager.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00028 | $0.01180 |
| Opus 5 | $0.00014 | $0.00590 |
| Sonnet 5 | $0.00006 | $0.00236 |
| Haiku 4.5 | $0.00003 | $0.00118 |
Grade A, and why
context-manager 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 10d 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 — 112 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Context Manager
<skill_contract> An active objective, runtime context limits, decision-critical state, evidence, budgets, and durable storage. A bounded context manifest, checkpoint, compaction decision, and capability-routing receipt. The next decision can be resumed without losing constraints, permissions, provenance, or failure history. <non_goals>Task orchestration, vendor-specific routing, hidden truncation, or retaining history that cannot change a decision.</non_goals>
Treat context as RAM, durable storage as disk, and tools as retrieval. Pay only for information that changes the next decision or prevents an execution error.
Usage Template
Provide: objective, phase, runtime context limit, token/cost budget, active constraints, current evidence, durable state location, and expected next decisions.
Workflow
Measure available budget from runtime data; do not infer limits or prices from model names. Partition context into objective, constraints, active state, evidence, open unknowns, and history. Identify the next irreversible or high-cost decision.
<unknowns_gate>
If runtime limits or durable state are unavailable, choose a conservative explicit budget or return NEEDS_INPUT. Never silently drop constraints, approvals, source provenance, failed attempts, or user decisions.
</unknowns_gate>
Apply KEEP / SUMMARIZE / DROP / RETRIEVE:
- KEEP: objective, acceptance criteria, permissions, active files, current state, fresh evidence, blockers.
- SUMMARIZE: completed exploration, superseded plans, verbose tool output; retain decisions and locators.
- DROP: duplicated prose, stale speculation, irrelevant logs, and reconstructible boilerplate.
- RETRIEVE: load detailed references only when the next action needs them.
Checkpoint at phase boundaries or before compaction. Route work by capability requirements such as reasoning depth, tool use, latency, cost, multimodality, and context capacity; runtime policy selects the implementation. Keep stable prompt prefixes unchanged when caching is available.
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.
- 10d ago First seen · 112 lines · 28 tokens per session scan A 5a5fc50115f6
context-manager is a skill published in the GitHub repository Mark393295827/third-brain-v7-skills (138 stars, last pushed 19d ago), licensed MIT. It adds 28 tokens to every session and 1,180 once invoked, about $0.0001 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 2026-08-30.
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