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 skills add operasoftware/opera-devtools-mcp --skill memory-leak-debugginggit clone --depth 1 https://github.com/operasoftware/opera-devtools-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/operasoftware/opera-devtools-mcp/memory-leak-debugging)<a href="https://agentmods.dev/skills/operasoftware/opera-devtools-mcp/memory-leak-debugging"><img src="https://agentmods.dev/badge/skills/operasoftware/opera-devtools-mcp/memory-leak-debugging/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/operasoftware/opera-devtools-mcp/memory-leak-debugging"><img src="https://agentmods.dev/badge/skills/operasoftware/opera-devtools-mcp/memory-leak-debugging.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 | $0.00052 | $0.00933 |
| Opus 5.5 | $0.00021 | $0.00373 |
| Sonnet 5.5 | $0.00010 | $0.00187 |
| Haiku 4.5 | $0.00005 | $0.00093 |
Grade B, and why
memory-leak-debugging 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 1mo 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.
Advanced memory debugging tools (`compare_heapsnapshots`, `get_heapsnapshot_details`, etc.) are only available when the server is started with the `--memoryDebugging` flag. First check if these tools are available; if no This is a copy
86% identical to memory-leak-debugging — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 59 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Memory Leak Debugging
This skill provides expert guidance and workflows for finding, diagnosing, and fixing memory leaks in JavaScript and Node.js applications using Chrome DevTools MCP tools.
Prerequisites
Advanced memory debugging tools (compare_heapsnapshots, get_heapsnapshot_details, etc.) are only available when the server is started with the --memoryDebugging flag. First check if these tools are available; if not, try to read the MCP configuration file to check if --memoryDebugging is enabled.
Core Principles
- Prefer MCP memory tools: Do NOT attempt to read raw
.heapsnapshotfiles directly, as they are extremely large and will consume too many tokens. Use the Chrome DevTools MCP heap snapshot tools to summarize, compare, and inspect snapshots. - Isolate the Leak: Determine if the leak is in the browser (client-side) or Node.js (server-side).
- Common Culprits: Look for detached DOM nodes, unhandled closures, global variables, event listeners not being removed, and caches growing unbounded. Note: Detached DOM nodes are sometimes intentional caches; always ask the user before nulling them.
- Close Loaded Snapshots: Heap snapshots can be large. After completing an investigation, use
close_heapsnapshotfor each loaded snapshot to release memory held by the MCP server.
Workflows
1. Capturing Snapshots
When investigating a frontend web application memory leak, utilize the chrome-devtools-mcp tools to interact with the application and take snapshots.
- Use page-scoped tools like
click,navigate_page,fill, etc. (specifyingpageId) to manipulate the page into the desired state. - Revert the page back to the original state after interactions to see if memory is released.
- Repeat the same user interactions 10 times to amplify the leak.
- Use
take_heapsnapshot(withpageId) to save.heapsnapshotfiles to disk at baseline, target (after actions), and final (after reverting actions) states.
2. Comparing Snapshots
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.
- 1mo ago Changed · +4 lines scan A → B 895127ac55a3
- 1mo ago First seen · 55 lines · 52 tokens per session scan A a8e7c7c2cddc
memory-leak-debugging is a skill published in the GitHub repository operasoftware/opera-devtools-mcp (14 stars, last pushed yesterday), licensed Apache-2.0. It adds 52 tokens to every session and 933 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it B with 1 finding (reads mcp configuration). It is 86% identical to memory-leak-debugging, differing in 0 lines, and is treated as a copy.
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