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/tinusj/swing-mcp/troubleshootingnpx skills add TinusJ/swing-mcp --skill troubleshootinggit clone --depth 1 https://github.com/TinusJ/swing-mcpWrote 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/tinusj/swing-mcp/troubleshooting)<a href="https://agentmods.dev/skills/tinusj/swing-mcp/troubleshooting"><img src="https://agentmods.dev/badge/skills/tinusj/swing-mcp/troubleshooting.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 | $0.00046 | $0.01386 |
| Opus 5 | $0.00023 | $0.00693 |
| Sonnet 5 | $0.00009 | $0.00277 |
| Haiku 4.5 | $0.00005 | $0.00139 |
Grade B, and why
troubleshooting scanned grade B with 1 finding 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.
Reads MCP configurationmediumAgent snooping
mcp.json carries server URLs and auth tokens; reading it lets a mod discover and abuse other integrations.
Your first action should be to locate and read the MCP configuration file. Search for the following files in the user's workspace: `.mcp.json`, `.vscode/mcp.json`, `.claude/settings.json`, `.cursor/mcp.json`, or the clie How it starts
The opening of the file, as written. The whole thing — 98 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Troubleshooting Wizard
You are acting as a troubleshooting wizard to help the user configure and fix their Swing MCP server setup. When this skill is triggered (e.g., because launch_app or attach_to_app failed, tools report that no session is connected, or the server wouldn't start), follow this step-by-step diagnostic process:
Step 1: Find and Read Configuration
Your first action should be to locate and read the MCP configuration file. Search for the following files in the user's workspace: .mcp.json, .vscode/mcp.json, .claude/settings.json, .cursor/mcp.json, or the client's global MCP settings.
If you find a configuration file, read and interpret it to identify potential issues such as:
- A relative or wrong path to the
swing-mcp-serverjar. - A missing or wrong
SWING_MCP_AGENT_JARenvironment variable (must be an absolute path to the shadedswing-mcp-agentjar). - A
javacommand that resolves to an old JDK.
If you cannot find any of these files, only then should you ask the user to provide their configuration file content.
Step 2: Triage Common Errors
Before reading documentation or suggesting configuration changes, check if the failure matches one of the following common patterns.
Symptom: Server doesn't start / no tools listed
The server requires JDK 21+. Some GUI clients don't inherit the shell PATH.
- Verify the Java version:
java -version(must be 21 or newer). - If multiple JDKs are installed, use an absolute path to the JDK 21+
javabinary in the MCP configuration instead of relying onPATH. - Remember that the server logs to
${java.io.tmpdir}/swing-mcp-server.log(e.g./tmp/swing-mcp-server.log) — console logging is disabled because stdout is reserved for the MCP stdio transport. Read this log for startup errors.
Error: launch_app / attach_to_app fails with a missing agent jar
The server needs the agent jar to preload (launch_app) or dynamically attach (attach_to_app) it.
- Check that
SWING_MCP_AGENT_JAR(or theswing.mcp.agent-jarproperty) is set in the MCP server configuration'senvblock. - Confirm the path is absolute and the file exists (e.g.
/path/to/swing-mcp/swing-mcp-agent/target/swing-mcp-agent-1.0.0.jaraftermvn verify). - Ask the user to restart the MCP server (or their AI client) after fixing the configuration.
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 · 98 lines · 46 tokens per session scan B d8abfd412df3
troubleshooting is a skill published in the GitHub repository TinusJ/swing-mcp (0 stars, last pushed 1mo ago), licensed MIT. It adds 46 tokens to every session and 1,386 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it B with 1 finding (reads mcp configuration). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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