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Microgram: station-count-drift-gate

station__algovigilance__microgram-station-count-drift-gate native (always callable) algovigilance pv-core Constructa Configa

Station-specific count drift gate. Wraps staleness-count-drift with ferroforge config surface semantics: fires DRIFTED when the ratio of (|measured - claimed| / claimed) exceeds the configured threshold. Intended for SessionStart hook enforcement.

Taxonomy

Linnaean classification joined from the algovigilance taxonomy index via the parent config's rank.

Rank	Value
domain	`Substrata`
kingdom	`Constructa`
phylum	`Configa`
class	`station-config`
order	`algovigilance`
family	`mcp-tool-config`

Characteristics:

substrate: config
domain: pv
lifecycle: continuous
authority: read
compounding: producer
io: agent-request → tool-response

Input schema

measured numberrequired — Current measured count (e.g., ls ferroforge/configs/*.json | wc -l)
claimed numberrequired — Count claimed in CLAUDE.md or MEMORY.md
threshold_pct number — Fractional drift threshold (default 0.05 = 5%)
surface_name string — Surface label for downstream reporting
drift_ratio numberrequired — Caller pre-computes abs(measured-claimed)/max(claimed,1). Passed to gate for comparison.
threshold_exceeded booleanrequired — Caller pre-computes (drift_ratio > threshold_pct). Microgram classifies.

Example call

POST /api/mcp
Content-Type: application/json

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "station__algovigilance__microgram-station-count-drift-gate",
    "arguments": {
      "measured": 0,
      "claimed": 0,
      "drift_ratio": 0,
      "threshold_exceeded": false
    }
  }
}

How to invoke from a client

From any MCP-aware client, add https://algovigilance.com/api/mcp as an MCP server, then call this tool by name. From a raw HTTP client, send the JSON-RPC body above to /api/mcp.

Agent-friendly formats

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