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/quasi/cl-mcp-server/integrationnpx skills add quasi/cl-mcp-server --skill integrationgit clone --depth 1 https://github.com/quasi/cl-mcp-serverWrote 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/quasi/cl-mcp-server/integration)<a href="https://agentmods.dev/skills/quasi/cl-mcp-server/integration"><img src="https://agentmods.dev/badge/skills/quasi/cl-mcp-server/integration.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 | $0.00029 | $0.01679 |
| Opus 5 | $0.00015 | $0.00839 |
| Sonnet 5 | $0.00006 | $0.00336 |
| Haiku 4.5 | $0.00003 | $0.00168 |
Grade A, and why
cl-mcp-server-integration 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 5d 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 — 198 lines — stays where its author put it; the contents beside it link to each section on GitHub.
cl-mcp-server — Integration Skill
A running SBCL process with a persistent REPL exposed as 36 MCP tools. Definitions accumulate across calls — defun in call 1 is callable in call 2.
Quick Start
Always call first:
tool: get-usage-guide
args: {}
Returns workflow guide with current best practices.
Minimal evaluation:
tool: evaluate-lisp
args: {"code": "(+ 1 2)"}
→ "=> 3"
Core Concepts
Persistent Session
State is global within a server process:
defun,defvar,defclass,ql:quickload→ persist for all subsequent callslet,let*bindings → scoped to one evaluationreset-sessionclears everything
Output Format
evaluate-lisp returns a text string with labeled sections:
[stdout]
Hello
[stderr]
WARNING: something
[Backtrace]
0: ...
=> 42
Only non-empty sections appear. Return value is always last.
Error Behavior
Errors do NOT crash the server. They return a formatted error string:
[ERROR] DIVISION-BY-ZERO
arithmetic error DIVISION-BY-ZERO signalled
Operation was (/ 1 0).
[Backtrace]
0: (/ 1 0)
...
isError: false in the MCP response even on Lisp errors. Check for [ERROR] prefix to detect failures.
Tool Categories
Full reference: .claude/skills/integration/references/tools-reference.md
| Category | Tools |
|---|---|
| Core evaluation | evaluate-lisp, compile-form, time-execution |
| Syntax | validate-syntax |
| Introspection | describe-symbol, apropos-search, macroexpand-form, who-calls, who-references |
| CLOS | class-info, find-methods |
| Error intelligence | describe-last-error, get-backtrace |
| Session | list-definitions, reset-session, configure-limits |
| ASDF | describe-system, system-dependencies, list-local-systems, find-system-file, load-system, load-file |
| Quicklisp | quickload, quicklisp-search |
| Profiling | profile-code, profile-functions, memory-report, allocation-profile |
| Telos | telos-list-features, telos-feature-intent, telos-get-intent, telos-intent-chain, telos-feature-members, telos-feature-decisions, telos-list-decisions |
| Workflow | get-usage-guide |
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 5d ago First seen · 198 lines · 29 tokens per session scan A 3d0f0ddb33f9
cl-mcp-server-integration is a skill published in the GitHub repository quasi/cl-mcp-server (36 stars, last pushed 1mo ago), licensed MIT. It adds 29 tokens to every session and 1,679 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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