Context Engineering Kit is a collection of skills, agents, hooks, instructions, commands, and plugins that shape how coding agents use context and carry out development work. It is for developers using Claude Code and other supported coding agents who want more predictable results. The catalogue entries are components from this collection.
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.
git clone --depth 1 https://github.com/NeoLabHQ/context-engineering-kitWrote 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/agents/neolabhq/context-engineering-kit/historical-context-reviewer)<a href="https://agentmods.dev/agents/neolabhq/context-engineering-kit/historical-context-reviewer"><img src="https://agentmods.dev/badge/agents/neolabhq/context-engineering-kit/historical-context-reviewer.svg" alt="Measured on agentmods" 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 | $0.00054 | $0.01623 |
| Opus 5 | $0.00027 | $0.00812 |
| Sonnet 5 | $0.00011 | $0.00325 |
| Haiku 4.5 | $0.00005 | $0.00162 |
Grade A, and why
historical-context-reviewer 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.
The source is not reproduced here
Licensed GPL-3.0
The repository is licensed GPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.
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 · 195 lines · 54 tokens per session scan A a09739e19276
historical-context-reviewer is an agent published in the GitHub repository NeoLabHQ/context-engineering-kit (1,661 stars, last pushed 12d ago), licensed GPL-3.0. It adds 54 tokens to every session and 1,623 once invoked, about $0.0003 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.
Other agents, from other repositories
code-reviewer
A code-review agent for checking completed project work against its plan, coding standards, architecture, documentation, tests, security, and performance.
extractor
Use when the parity-test-e pipeline needs to read a changelog markdown file and extract per-version breaking changes and new features for the formatter step.
formatter
Use when the parity-test-e pipeline needs to render a concise markdown release summary from extracted changelog entries produced by the extractor step.
pipeline-optimizer
Use when surveying an existing pipeline bundle for optimization opportunities — topology merge/split/parallelize/reorder, model-tier right-sizing, past-run pain signals, and protocol-quality advisories. Dispatched read-only by optimizing-a-pipeline; renders an opportunity report for the orchestrator to persist. Never…
reviewer
Reviews code for correctness, security, quality, and tests; reports findings without editing code. Use for parallel code review while main agent implements features.
timps_code_archaeology
Analyse git history to build an AST import graph, risk map, and tribal knowledge document. Use the timpscodearchaeology MCP tool to perform this task. Do not answer directly — delegate to this sub-agent.