Chamber
Two-key JSON seal/open. Cloak needs a live license. Open is keys-only.
Install
Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).
json-chamber-mcpclaude mcp add chamber -- npx -y json-chamber-mcp@1.2.0{
"mcpServers": {
"chamber": {
"command": "npx",
"args": [
"-y",
"json-chamber-mcp@1.2.0"
]
}
}
}Documentation
From the project's README on GitHub, refreshed weekly. Links open on GitHub.
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_1Fields (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
Frequently asked questions
What is Chamber?
Two-key JSON seal/open. Cloak needs a live license. Open is keys-only.
How do I install Chamber?
It runs on your machine. In Claude Code: claude mcp add chamber -- npx -y json-chamber-mcp@1.2.0. For other clients, paste the JSON configuration from this page into their MCP settings.
Does Chamber need an API key?
Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.
Is Chamber open source?
Its code is public on GitHub, but the repository does not declare a standard license.
Who maintains Chamber?
It is published by ceedot-rock. AI.tn lists it but does not maintain or endorse it.
From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.