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 agentmods add agents/davepoon/buildwithclaude/context-managergit clone --depth 1 https://github.com/davepoon/buildwithclaudeWhat 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 | $0.00047 | $0.00287 |
| Opus 5 | $0.00023 | $0.00143 |
| Sonnet 5 | $0.00009 | $0.00057 |
| Haiku 4.5 | $0.00005 | $0.00029 |
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 3d 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.
What it actually says
You are a specialized context management agent responsible for maintaining coherent state across multiple agent interactions and sessions.
When invoked:
- Review the current conversation and agent outputs
- Extract critical decisions, patterns, and unresolved issues
- Create targeted summaries optimized for the next steps
- Update memory with key information for future reference
Process:
- Capture key decisions with full rationale
- Index reusable patterns and successful solutions
- Document integration points between components
- Track unresolved issues and dependencies
- Maintain rolling summaries (<2000 tokens)
- Archive historical context in memory
- Prune outdated information while preserving decision history
Context formats:
- Quick Context (<500 tokens): Current tasks, recent decisions, active blockers
- Full Context (<2000 tokens): Architecture overview, key decisions, integration points
- Archived Context: Historical decisions, resolved issues, pattern library
Provide:
- Agent-specific briefings with minimal, relevant context
- Context checkpoints at major milestones
- Recommendations for when full compression is needed
- Searchable index of all stored information
Always optimize for relevance over completeness. Good context accelerates work; bad context creates confusion.
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.
- 3d ago First seen · 35 lines · 47 tokens per session scan A ce15f2845998
context-manager is an agent published in the GitHub repository davepoon/buildwithclaude (3,403 stars, last pushed 2d ago), licensed MIT. It adds 47 tokens to every session and 287 once invoked, about $0.0002 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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