io.github.vola-trebla/v8-cpu-profile-decoder-mcp
NPM · V8-CPU-PROFILE-DECODER-MCP · SCANNED AUG 3
MCP server that decodes V8 CPU profiles into token-efficient bottleneck summaries for AI agents
Available components
How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. How we score →
Supply Chain Security87
- No malware found by supply-chain analysis.Pass
- Only part of the dependency tree could be resolved (95 of 99), so this covers what we could see, not the whole tree.Partial
- No install/post-install scripts declared.Pass
- Only part of the dependency tree could be resolved (95 of 99), so this covers what we could see, not the whole tree. View diagnostics → Partial
Provenance & Transparency45
- Source repository is publicly reachable at the declared URL. View diagnostics → Pass
- Provenance check failed: no build-provenance attestation is published. See how to fix → View diagnostics → Fail
- Clear OSI-approved license (MIT).Pass
- Actively maintained (last published 75 days ago).Pass
- Disclosure check failed: no security disclosure policy was found in the source repository. See how to fix → Fail
Schema Quality & AI Usability75
- AI-judged instruction clarity (excellent).Pass
- Context-footprint check failed: tool/resource definitions use about 986 tokens (~164/item across 6 items; 6 tools + 0 resources), over budget; trim descriptions and params. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management23
- Stability observed for 7 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
Add this component to your MCP client. Where a client-specific snippet is available, pick your client below and copy it straight into your config; otherwise use the connection detail shown.
npm · v8-cpu-profile-decoder-mcp
claude mcp add vola-trebla-v8-cpu-profile-decoder-mcp -- npx -y v8-cpu-profile-decoder-mcp
codex mcp add vola-trebla-v8-cpu-profile-decoder-mcp -- npx -y v8-cpu-profile-decoder-mcp
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"vola-trebla-v8-cpu-profile-decoder-mcp": {
"type": "local",
"command": [
"npx",
"-y",
"v8-cpu-profile-decoder-mcp"
],
"enabled": true
}
}
} openclaw mcp add vola-trebla-v8-cpu-profile-decoder-mcp --command npx --arg -y --arg v8-cpu-profile-decoder-mcp
mcp_servers:
vola-trebla-v8-cpu-profile-decoder-mcp:
command: "npx"
args: ["-y", "v8-cpu-profile-decoder-mcp"] {
"mcpServers": {
"vola-trebla-v8-cpu-profile-decoder-mcp": {
"command": "npx",
"args": [
"-y",
"v8-cpu-profile-decoder-mcp"
]
}
}
} Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 3 Aug 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.
- 2 Aug 26 +49
- Provenance: unverified → fail ▼ security
- Install scripts: unverified → pass ▲ security
- Known CVEs: unverified → partial ▲ security
- Malware scan: unverified → pass ▲ security
- Security disclosure: fail → unverified ▼ functional
- Tool coverage: 100 → unverified ▼ functional
- Schema quality: unverified → excellent ▲ functional
- License: unverified → pass ▲ functional
- Dependency health: unverified → partial ▲ functional
- Stability: unverified → 0.20 ▲ functional
- Maintenance: unverified → pass ▲ functional
- MCP protocol: unverified → pass ▲ functional
- First check of Schema quality: unverified functional
- Licence: MIT functional
- 31 Jul 26 −7
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 30 Jul 26 −18
- Malware scan: pass → unverified ▼ security
- 27 Jul 26 44
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 3 Aug 2026 · Analysed npm/[email protected]
Provenance none
Ecosystem: npm · Outcome: none
Dependencies 95 packages
95 packages in the resolved dependency tree · 95 deprecated · 29 stale.
The dependency tree was only partially resolved, so these counts may be incomplete.
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability.
analyze_async_bottlenecks ~132
Detects event-loop overhead in a V8 CPU profile by identifying V8 internal frames that represent async machinery — microtask queue processing, nextTick saturation, and timer/immediate callbacks. These frames are invisible to most profilers but consume real CPU when promise chains are deep or nextTick is overused. Use to answer: is the bottleneck async orchestration overhead rather than synchronous computation?
| Name | Type | Req | Description |
|---|---|---|---|
| profile_path | string | yes | Absolute path to the .cpuprofile file |
| threshold_percent | number | — | Async overhead percentage above which a warning is emitted in the verdict (default: 10) |
No output schema declared.
No examples provided.
analyze_call_tree_path ~115
Finds all callers of a specific function in a V8 CPU profile and returns how often each caller invoked it. Accepts partial, case-insensitive function name matching. Use to answer: what is calling my slow function and how many times?
| Name | Type | Req | Description |
|---|---|---|---|
| function_name | string | yes | Function name to search for (partial match, case-insensitive) |
| profile_path | string | yes | Absolute path to the .cpuprofile file |
| top_callers | integer | — | Number of top callers to return (default: 5) |
No output schema declared.
No examples provided.
analyze_gc_pressure ~146
Analyses a V8 .cpuprofile for garbage collection overhead. Reports total GC time as a percentage of profiling duration, broken down by GC type (Scavenger = short-lived object pressure, Mark-Sweep/Mark-Compact = old-space pressure, Incremental = high allocation rate). Flags when GC exceeds a configurable threshold and provides a targeted recommendation. Use to answer: is GC the bottleneck, and what kind of allocation pattern is causing it?
| Name | Type | Req | Description |
|---|---|---|---|
| profile_path | string | yes | Absolute path to the .cpuprofile file |
| threshold_percent | number | — | GC percentage above which exceeds_threshold is set to true and a warning is emitted (default: 10) |
No output schema declared.
No examples provided.
correlate_source_code ~129
Maps the hottest functions in a V8 CPU profile back to their original TypeScript source locations using source map files (.js.map). Falls back to compiled JS locations if no source map is found. Use to answer: which TypeScript file and line is the bottleneck actually coming from?
| Name | Type | Req | Description |
|---|---|---|---|
| profile_path | string | yes | Absolute path to the .cpuprofile file |
| sourcemap_dir | string | — | Override directory to search for .map files (default: same directory as .js file) |
| top_n | integer | — | Number of hottest functions to resolve (default: 10) |
No output schema declared.
No examples provided.
diff_profiles ~157
Compares two V8 .cpuprofile files (before and after an optimization) and returns per-function CPU time deltas, normalized against each profile's total duration. Frames are matched by call-frame coordinates (functionName + url + line + column), not by transient node IDs, so alignment is stable across profiling sessions. Use to answer: which functions improved or regressed after my change, and by how much?
| Name | Type | Req | Description |
|---|---|---|---|
| after_profile_path | string | yes | Absolute path to the optimized .cpuprofile file to compare against the baseline |
| before_profile_path | string | yes | Absolute path to the baseline .cpuprofile file |
| top_n | integer | — | Number of top improvements and regressions to return (default: 5) |
No output schema declared.
No examples provided.
extract_hottest_functions ~307
Parses a V8 .cpuprofile file and returns the top N functions ranked by exclusive CPU time (self time). Filters out V8 internals and Node.js built-ins by default, returning only user code. Framework frames (express, next.js, koa, etc.) can be collapsed into a single entry. Recursive calls to the same source location are merged with an instanceCount field. Use this first to identify which functions are consuming the most CPU in a Node.js performance profile.
| Name | Type | Req | Description |
|---|---|---|---|
| collapse_frameworks | boolean | — | Collapse all frames from known frameworks (express, next.js, koa, fastify, nestjs, react, vue, nuxt, hapi) into a single "<framework> internals>" entry per framework. Prevents dozens of small framewo… |
| collapse_recursion | boolean | — | Merge multiple nodes with the same source location (functionName + url + line + column) into one entry. instanceCount shows how many recursive instances were merged (default: true) |
| include_node_internals | boolean | — | Include V8 internals and Node.js built-ins in results (default: false) |
| min_self_percent | number | — | Minimum self time percentage to include a function (default: 0.5%) |
| profile_path | string | yes | Absolute path to the .cpuprofile file |
| top_n | integer | — | Number of hottest functions to return (default: 10) |
No output schema declared.
No examples provided.