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MNPI Filter

The mnpi-filter policy blocks configured phrases during the output phase. It uses detect_patterns or a small built-in list. A phrase match does not determine that the information is material, non-public, or subject to securities law.

Configuration​

pack:
  name: mnpi-filter
  version: "1.0.0"
  enabled: true

policies:
  chain:
    - mnpi-filter

policy:
  mnpi-filter:
    detect_patterns:
      - "earnings before announcement"
      - "merger not public"
      - "insider information"
      - "board decision"

Fields​

FieldTypeDescriptionDefault
detect_patternsstring[]Phrases are not case-sensitive. An empty list uses the built-in list below.built-in list
actionblockThis is the only accepted action. Each match causes a block.block

Built-in defaults​

If you do not specify detect_patterns, the gateway uses this default list:

  • earnings before announcement
  • merger not public
  • insider information
  • board decision
  • not public

How it works​

  1. Output text: The gateway gets assistant text from the buffered response body.
  2. Pattern check: The gateway changes the text to lowercase and examines configured or built-in phrases.
  3. Context details: The policy records nearby terms such as earnings, merger, ipo, or acquisition.
  4. Verdict: A phrase match blocks the output with reason_code = "mnpi.detected".

Important limitations​

  • This policy evaluates output text only.
  • The policy does not support a configurable warn or redact mode today.
  • The built-in list is small. Add phrases that apply to your organization.
  • Use stream: false. The active SSE path does not run this evaluator.

Correct examples​

Default output block​

pack:
  name: mnpi-defaults
  version: "1.0.0"
  enabled: true

policies:
  chain:
    - mnpi-filter

policy:
  mnpi-filter: {}

Add specified firm phrases​

pack:
  name: investment-banking-guardrail
  version: "1.0.0"
  enabled: true

policies:
  chain:
    - mnpi-filter
    - financial-compliance

policy:
  mnpi-filter:
    detect_patterns:
      - "earnings before announcement"
      - "pending acquisition"
      - "guidance revision not public"
      - "board decision"
      - "deal valuation confidential"

Best practices​

  • Replace or extend the defaults with phrases from your legal and compliance teams.
  • Pair with financial-compliance for broader finance-output controls.
  • Review blocked events regularly. Change the phrase list after you find false results or missed phrases.

Next steps​