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Server Configuration

Describes the environment variables required to run the server.

NameRequiredDescriptionDefault
QNEXUS_MCP_PROJECTSNoComma-separated project allowlist, enforced on every mutating tool
QNEXUS_MCP_TOOLSETSNoCapability domains to expose (read,execute,manage,destructive)read
QNEXUS_MCP_ALLOW_SPENDNoPermit credit-spending (HQC) executionfalse
QNEXUS_MCP_MAX_CREDITSNoHard per-call HQC ceiling; 0 blocks all spend0
QNEXUS_MCP_MAX_OUTCOMESNoTop-N cap on distinct measurement outcomes returned per result (truncation is always reported)100
QNEXUS_MCP_ALLOW_HARDWARENoPermit real-QPU targetsfalse
QNEXUS_MCP_ALLOW_DESTRUCTIVENoPermit delete/cancel/archivefalse
QNEXUS_MCP_MAX_SUBMISSIONS_PER_MINUTENoSliding-window submission cap; each circuit in a batch counts as one6

Capabilities

Features and capabilities supported by this server

CapabilityDetails
tools
{
  "listChanged": true
}
logging
{}
prompts
{
  "listChanged": false
}
resources
{
  "subscribe": false,
  "listChanged": false
}
extensions
{
  "io.modelcontextprotocol/ui": {}
}
experimental
{}

Tools

Functions exposed to the LLM to take actions

NameDescription
nexus_auth_statusA

Report whether a valid Nexus session exists.

nexus_whoamiA

Return the authenticated Nexus user.

nexus_list_devicesA

List available backends and their status.

nexus_device_statusA

Report whether a device is online. Emulators/syntax checkers are always available.

nexus_list_projectsA

List Nexus projects visible to the user (one page of up to limit, plus the total count).

Optional name_like substring filter; set archived to list archived projects instead.

nexus_get_quotaA

Return remaining compilation/simulation quotas.

nexus_list_jobsA

List jobs visible to the user (one page of up to limit, plus the total count).

Optional filters: exact project name, status (e.g. COMPLETED, RUNNING, ERROR), and a name_like substring. Occasionally returns a Nexus-side server error unrelated to your request; if so, use nexus_job_status / nexus_get_results by id instead of retrying this call.

nexus_job_statusA

Return the status of a job by id.

nexus_job_costA

Return the HQC cost of an existing job by id.

nexus_get_resultsA

Return measurement counts for a completed job by id.

Counts are capped at the top --max-outcomes outcomes by frequency; total_outcomes / omitted_outcomes / omitted_shots report any truncation. Multi-circuit (batch) jobs return one entry per circuit under items, in submission order.

Prompts

Interactive templates invoked by user choice

NameDescription

No prompts

Resources

Contextual data attached and managed by the client

NameDescription

No resources

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