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 skills/codingagentsystem/cas/cas-searchnpx skills add codingagentsystem/cas --skill cas-searchgit clone --depth 1 https://github.com/codingagentsystem/casWhat 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 | $0.00055 | $0.00519 |
| Opus 5 | $0.00028 | $0.00260 |
| Sonnet 5 | $0.00011 | $0.00104 |
| Haiku 4.5 | $0.00006 | $0.00052 |
Grade A, and why
cas-search 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 2d 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
CAS Search
Use mcp__cas__search to find information across CAS content and code. Choose the right action for the job:
Which Action to Use
search — Conceptual queries across memories, tasks, rules, skills:
mcp__cas__search action=search query="authentication flow" doc_type=entry
Filter with doc_type (entry, task, rule, skill, code_symbol, code_file) for better relevance.
code_search — Find code symbols by what they do, not exact names:
mcp__cas__search action=code_search query="user authentication" kind=function language=rust
Use include_source=true to get source code inline.
grep — Exact regex pattern matching in files:
mcp__cas__search action=grep pattern="TODO:" glob="*.rs"
Prefer the built-in Grep tool for simple patterns where you already know file paths.
Decision Guide
| Need | Action |
|---|---|
| "How does X work?" | search or code_search |
| Find exact string or regex | grep |
| Find past learnings | search with doc_type=entry |
| Find function by concept | code_search |
| Find related tasks | search with doc_type=task |
Other Actions
context— Session context summary: recent activity, active tasks, relevant memoriescontext_for_subagent— Task-focused context for spawning subagents (passtask_idandmax_tokens)observe— Record discoveries/decisions during work (observation_type: general, decision, bugfix, feature, refactor, discovery)entity_list/entity_show— Browse extracted entities (person, project, technology, etc.)code_show— Full details for a specific code symbol by IDblame— Git blame with optional AI-line filtering (file_path,line_start,line_end)
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.
- 2d ago First seen · 49 lines · 55 tokens per session scan A 690b11390af3
cas-search is a skill published in the GitHub repository codingagentsystem/cas (151 stars, last pushed 5mo ago), licensed MIT. It adds 55 tokens to every session and 519 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 skills, from other repositories
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Use the Notion API to create/read/update pages, data sources (databases), and blocks.
multi-search-engine
Use this skill when ordinary websearch is not enough and you need engine-specific public-web search strategy.
writing-plans
Use when the user asks for an implementation plan or when a coding task is large enough that it should be decomposed before editing.