Server data from the Official MCP Registry
Two-key JSON seal/open. Cloak needs a live license. Open is keys-only.
About
Two-key JSON seal/open. Cloak needs a live license. Open is keys-only.
Security Report
This MCP server implements cryptographic JSON sealing with a license-gating system. The code is well-structured with proper use of Node.js crypto APIs and no obvious malicious patterns. However, there are moderate security concerns: (1) the default master secret fallback is a weak hardcoded string, (2) license state is stored in plaintext JSON files in the home directory with HMAC-based tampering detection rather than proper encryption, and (3) the license verification system relies on environment variable inspection without formal API validation. Permissions are appropriate for the stated purpose. Supply chain analysis found 1 known vulnerability in dependencies (0 critical, 1 high severity). Package verification found 1 issue.
5 files analyzed · 8 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-ceedot-rock-json-chamber-mcp": {
"args": [
"-y",
"json-chamber-mcp"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
json-chamber-mcp
Chamber MCP — seal / open JSON. Slid Phi Labs.
Cloak (seal new JSON) needs a live license. Open of an already-sealed blob is both keys, no extra payment. Ciphertext does not expire.
Install / run
npx -y json-chamber-mcp
{
"mcpServers": {
"json-chamber": {
"command": "npx",
"args": ["-y", "json-chamber-mcp"],
"env": {
"CHAMBER_MASTER_SECRET": "your-high-entropy-secret"
}
}
}
}
Discovery
| Surface | URL |
|---|---|
| Official registry id | io.github.ceedot-rock/json-chamber-mcp |
| Lab well-known | https://www.slidphilabs.com/.well-known/mcp.json |
| Lab llms.txt | https://www.slidphilabs.com/llms.txt |
| npm | json-chamber-mcp 1.2.0 |
| Server schema | server.json |
| Product | https://www.slidphilabs.com/chamber |
Hosted lab MCP (PCC + catalog): POST https://www.slidphilabs.com/mcp · Smithery: https://smithery.ai/servers/slidphi/lab
Pricing
| SKU | What | Price |
|---|---|---|
| Chamber try | cloak new JSON | 24 hours free |
| Chamber month | cloak license | $9 |
| Chamber year | cloak license | $99 |
| Open | already-sealed blob | keys only |
Prices live on https://www.slidphilabs.com/chamber
Tools
| Tool | Purpose |
|---|---|
chamber_status | cloak try remaining / dead / purchased |
chamber_info | pointer to live prices |
chamber_cloak | seal JSON / text (licensed) |
chamber_open | open sealed blob (keys only) |
chamber_hop_gate | admit/reject hop (gate only) |
chamber_hop_reject_log | live sanitized reject log |
Hop-gate (ScanChunk / Rider SoT)
Admission layer in front of seal/open. Seal/open APIs are unchanged. No SettleHop / x402.
Wire is exact text (Agent-Rider agent-rider-c / PR #22), not JSON:
CUNI ScanChunk
url=https://example.com/
etag="abc"
hash=sha256:…
agent_id=agt_1
Fields (allowlist): url · etag · hash · agent_id. Gate result wire is a single exact-text code string (not a JSON body).
| Code | Meaning |
|---|---|
admit | hop allowed |
reject.schema | Chamber-local only (Rider does not emit) |
reject.extra | unknown keys or wrong kind — fail-closed; do not bind; never rehydrate |
reject.hash | empty / invalid hash |
reject.replay | hash already seen |
reject.agent | agent allowlist fail |
reject.empty | empty / missing required fields (url, hash, agent_id) |
Live reject.log is TSV ISO\tcode\tpreview (mirrors agent-rider-c/reject.log); preview truncates ~120 and flattens newlines. Extra-key values never rehydrate as next machine input.
PCC ≠ payment — PCC is the compression/storefront face; hop-gate codes are admission control, not billing.
MCP tools: chamber_hop_gate, chamber_hop_reject_log.
Related
- Python SDK: https://github.com/ceedot-rock/json-chamber-sdk
- Product: https://www.slidphilabs.com/chamber
- Contact: corey@slidphilabs.com
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