DEPRECATED (2026-02-17) — Superseded by DataSubAgents architecture (--pit + pit_gate.py hooks).
Use data sub-agents directly with --pit <ISO8601>. This skill is retained for reference only.

FILTER PROTOCOL (LEGACY)

Arguments: $ARGUMENTS

Step 1: PARSE

Extract: AGENT (after --agent), QUERY (after --query), PIT (from [PIT: datetime] if present)

Step 2: FETCH DATA

Call Skill tool: skill=AGENT, args=QUERY Store the COMPLETE response for validation.

Step 3: VALIDATE (MANDATORY)

YOU MUST EXECUTE THIS BASH COMMAND. DO NOT SKIP OR SIMULATE.

First, output "[VALIDATING]" on its own line.

Then create a temp file with the COMPLETE response and validate it:

cat > /tmp/validate_input.txt << 'DATAEOF'
<paste the COMPLETE response from Step 2 here - every line, unmodified>
DATAEOF

cat /tmp/validate_input.txt | /home/faisal/EventMarketDB/.claude/filters/validate.sh --source "AGENT_NAME" --pit "PIT_TIMESTAMP"

Example for perplexity-search:

cat > /tmp/validate_input.txt << 'DATAEOF'
[
  {"title": "Article 1", "url": "...", "snippet": "...", "date": "2023-02-20"},
  {"title": "Article 2", "url": "...", "snippet": "...", "date": "2023-02-21"}
]
DATAEOF

cat /tmp/validate_input.txt | /home/faisal/EventMarketDB/.claude/filters/validate.sh --source "perplexity-search" --pit "2023-02-22T16:52:26-05:00"

The script outputs:

• "CLEAN" = data passes all checks
• "CONTAMINATED:PIT_VIOLATION:YYYY-MM-DD" = date after PIT found (exit code 1)
• "CONTAMINATED:FORBIDDEN_PATTERN:name" = forbidden field found (exit code 1)

CRITICAL: Show the exact output from the validation command. Do not paraphrase.

Step 4: RETURN

Check what the validation bash command output:

If the output was exactly "CLEAN":

• Output "[VALIDATED:CLEAN]" on its own line
• Return the complete data response from Step 2

If the output started with "CONTAMINATED:":

• Output "[VALIDATED:CONTAMINATED]" on its own line
• Extract the violation type (e.g., "PITVIOLATION" or "FORBIDDENPATTERN")
• DO NOT return ANY data from the response
• Return error: "Data validation failed: [violation_type] violated PIT constraint"
• NEVER include specific dates, values, field contents, or article titles from contaminated data

Example of correct contamination handling:

Validation output: CONTAMINATED:PIT_VIOLATION:2025-06-04

Your response:
[VALIDATED:CONTAMINATED]
Data validation failed: PIT_VIOLATION violated PIT constraint

REDACTION RULE: When contamination detected, report ONLY the violation type. NEVER mention specific dates, values, article titles, URLs, or any content from the contaminated data.

**Execute steps 1-4 in order. Show [VALIDATING] and [VALIDATED:*] markers.**