Two-key JSON seal/open. Cloak needs a live license. Open is keys-only.
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.
npx -y json-chamber-mcp
{
"mcpServers": {
"json-chamber": {
"command": "npx",
"args": ["-y", "json-chamber-mcp"],
"env": {
"CHAMBER_MASTER_SECRET": "your-high-entropy-secret"
}
}
}
}
| 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
| 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
| 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 |
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.
Source-derived launch command. Check the maintainer’s required arguments and credentials before running:
npx -y json-chamber-mcpMerge this template into ~/Library/Application Support/Claude/claude_desktop_config.json. Keep existing servers. Add any arguments, credentials, and permissions required by the maintainer; this template has not been install-tested.
{
"mcpServers": {
"io-github-ceedot-rock-json-chamber-mcp": {
"command": "npx",
"args": [
"-y",
"json-chamber-mcp"
]
}
}
}Restart Claude Desktop completely for changes to take effect. Confirm the server appears connected in the client’s tool list, then try a read-only example from its documentation.
Claude Desktop setup referenceChamber works with any MCP-compatible client. Copy the config snippet from the Configuration section above and add it to the file shown for your client, then restart the application.
~/Library/Application Support/Claude/claude_desktop_config.jsonRestart Claude Desktop completely for changes to take effect.~/.cursor/mcp.jsonRestart Cursor for changes to take effect..vscode/mcp.jsonReload VS Code window for changes to take effect.~/.codeium/windsurf/mcp_config.jsonRestart Windsurf for changes to take effect..mcp.jsonSave at the project root, then start Claude Code in that project and review the MCP server approval prompt. Keep real credentials out of shared files.