Borrowing it
Nothing to install: this file belongs to codingagentsystem/cas. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/codingagentsystem/cas/main/.claude/skills/cas-search/SKILL.mdgit clone --depth 1 https://github.com/codingagentsystem/casWrote 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/codingagentsystem/cas/cas-search)<a href="https://agentmods.dev/skills/codingagentsystem/cas/cas-search"><img src="https://agentmods.dev/badge/skills/codingagentsystem/cas/cas-search/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/codingagentsystem/cas/cas-search"><img src="https://agentmods.dev/badge/skills/codingagentsystem/cas/cas-search.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 | $0.00055 | $0.00519 |
| Opus 5.5 | $0.00022 | $0.00208 |
| Sonnet 5.5 | $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 2mo 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.
- 2mo ago First seen · 49 lines · 55 tokens per session scan A 690b11390af3
cas-search is a skill published in the GitHub repository codingagentsystem/cas (177 stars, last pushed 7mo ago), licensed MIT. It adds 55 tokens to every session and 519 once invoked, about $0.0002 per session on Opus 5.5. 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.
cas-search compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| cas-searchcodingagentsystem/cas | Skill | 177 | 7mo ago | MIT | A | 55 | Claude Code |
| continuous-learningJSK9999/ai-nexus | Skill | 19 | 8mo ago | Apache-2.0 | B | 21 | Claude Code, Codex |
| byterovercampfirein/byterover-cli | Skill | 4.9k | 4mo ago | none | A | 98 | Claude Code, Codex |
| ai-historyjiantao88/ai-history | Skill | 3 | 4mo ago | MIT | C | 52 | Claude Code |
| ai-historyjiantao88/ai-history | Skill | 3 | 4mo ago | MIT | C | 64 | Claude Code, Codex |
| strategic-compactJSK9999/ai-nexus | Skill | 19 | 8mo ago | Apache-2.0 | B | 27 | Claude Code |
| mnemonmnemon-dev/mnemon | Skill | 693 | 6d ago | Apache-2.0 | A | 25 | Claude Code, Codex |