10 KiB
BPMN-Aware Large-Scale Process Analysis through LLM Tool Orchestration
Abstract
This paper proposes a novel approach for analyzing large volumes of business process data by combining three concepts: (1) pre-generated process summaries ("Project Insights"), (2) BPMN process definitions as discoverable metadata, and (3) LLM-driven tool orchestration inspired by Recursive Language Models. The approach enables natural language queries across thousands of workflow instances without hitting context window limitations, while leveraging existing process knowledge encoded in BPMN models.
1. Problem Statement
Enterprise workflow systems accumulate vast amounts of process data. A typical scenario:
- 10,000+ completed workflow instances over 6 months
- Multiple workflow types (orders, complaints, quotes, support tickets)
- Rich contextual data per instance (documents, communications, decisions)
Challenge: Users want to ask analytical questions like "How did our sales perform in 2025?" — questions that implicitly span multiple workflow types and require correlation of thousands of instances.
Limitations of current approaches:
| Approach | Limitation |
|---|---|
| Direct LLM query | Context window exceeded |
| Pre-built reports | Cannot handle ad-hoc questions |
| Manual analysis | Time-consuming, not scalable |
| Simple RAG | Retrieves fragments, misses cross-process patterns |
2. Proposed Solution
2.1 Core Idea
Treat the LLM not as a processor of raw data, but as an orchestrator that:
- Discovers available workflow types through BPMN metadata
- Decides which processes are relevant to a given question
- Retrieves condensed summaries in manageable chunks
- Correlates across workflow types when needed
- Synthesizes findings into coherent answers
2.2 Key Enablers
A) Project Insights (Pre-Condensed Summaries)
Each workflow instance already generates a structured summary at key process steps:
Project Insight:
Event: A quotation request was received from Tom Brack of TechBridge,
Tokyo for electronic equipment suitable for Arctic conditions...
Unusual/Important Note: Sales team suggested offering products still
in development...
This reduces token volume by ~95% while preserving analytical value.
B) BPMN as Discoverable Metadata
Process definitions provide machine-readable context:
- Available workflow types and their relationships
- Process steps and decision points
- Data fields captured at each stage
- Semantic documentation
The LLM can query this metadata to understand what exists before deciding what to analyze.
C) Tool-Based Access Pattern
Instead of feeding data directly into the context window, provide callable tools:
| Tool Category | Purpose |
|---|---|
| Discovery | List workflow types, describe process structure |
| Retrieval | Fetch insights by type, filter, pagination |
| Correlation | Find relationships across workflow types |
| Aggregation | Calculate cross-process metrics |
3. Architecture Overview
┌─────────────────────────────────────────────────────────────┐
│ User Query │
│ "How did our sales perform in 2025?" │
└─────────────────────────────────────────────────────────────┘
│
▼
┌─────────────────────────────────────────────────────────────┐
│ LLM Orchestrator │
│ │
│ 1. What workflow types exist? → discoverWorkflows() │
│ 2. Which are relevant? → orders, quotes, complaints │
│ 3. What are the metrics? → calculateMetrics() │
│ 4. Any anomalies? → correlateWorkflows() │
│ 5. Deep dive needed? → getInsights(filter, chunk) │
│ 6. Synthesize response │
└─────────────────────────────────────────────────────────────┘
│
▼
┌─────────────────────────────────────────────────────────────┐
│ Tool Layer │
│ ┌─────────────┐ ┌─────────────┐ ┌─────────────┐ │
│ │ Discovery │ │ Retrieval │ │ Correlation │ │
│ └─────────────┘ └─────────────┘ └─────────────┘ │
└─────────────────────────────────────────────────────────────┘
│
┌───────────────┴───────────────┐
▼ ▼
┌──────────────────────┐ ┌──────────────────────┐
│ BPMN Metadata │ │ Project Insights │
│ │ │ │
│ - Process definitions│ │ - Pre-condensed │
│ - Workflow types │ │ - Per instance │
│ - Data schemas │ │ - Flagged anomalies │
└──────────────────────┘ └──────────────────────┘
4. Relation to Existing Research
4.1 Recursive Language Models (Zhang et al., 2025)
RLM proposes treating long contexts as external variables accessible through a REPL environment. Our approach adopts the core insight — data as environment, not input — but replaces arbitrary code execution with controlled tool interfaces.
| RLM (Paper) | Our Approach |
|---|---|
| Python REPL | Defined tool interface |
| Arbitrary code | Controlled operations |
| Generic text context | Structured BPMN + Insights |
| LLM decides chunking | Tools handle pagination |
4.2 Function Calling / Tool Use
Standard LLM tool use focuses on single-purpose functions. Our contribution is the discovery layer: the LLM first learns what workflow types exist, then decides which to query — enabling truly ad-hoc analysis without pre-built report logic.
5. Required Tool Categories
5.1 Discovery Tools
| Tool | Input | Output |
|---|---|---|
discoverWorkflows |
period | List of workflow types with counts |
describeWorkflow |
workflowType | Process steps, data fields, sample |
5.2 Retrieval Tools
| Tool | Input | Output |
|---|---|---|
getInsights |
type, filter, chunk | Paginated insight summaries |
getStatistics |
type, period | Aggregate counts and metrics |
5.3 Correlation Tools
| Tool | Input | Output |
|---|---|---|
correlateWorkflows |
typeA, typeB, key | Cross-process relationships |
calculateMetrics |
types[], period | KPIs spanning multiple types |
5.4 Session Tools
| Tool | Input | Output |
|---|---|---|
storeAnalysis |
category, content | Persist intermediate findings |
getStoredAnalyses |
— | Retrieve for final synthesis |
6. Expected Benefits
-
Unlimited Scale: No context window constraints; 10K or 100K instances handled identically
-
Ad-Hoc Flexibility: New question types require no new code — LLM discovers relevant workflows
-
Cross-Process Intelligence: Automatic correlation (e.g., complaints ↔ orders) reveals hidden patterns
-
Controlled Execution: Unlike open REPL, tool interface ensures security and auditability
-
Incremental Enhancement: New workflow types automatically become queryable
7. Open Questions
- Chunking Strategy: Fixed size vs. semantic boundaries vs. LLM-determined?
- Caching: How to cache intermediate analyses across similar queries?
- Confidence: How does the LLM signal when data is insufficient?
- Cost Control: Maximum tool calls per query? Budget-aware orchestration?
8. Next Steps
- Define minimal viable tool interface (Discovery + Retrieval)
- Prototype with single workflow type
- Evaluate chunking strategies empirically
- Add correlation tools
- Benchmark against direct-context baseline
References
- Zhang, A.L., Kraska, T., Khattab, O. (2025). Recursive Language Models. arXiv:2512.24601
- OpenAI (2024). Function Calling Documentation.
- OMG (2013). Business Process Model and Notation (BPMN) Version 2.0.2