---
license: cc-by-4.0
task_categories:
- text-generation
language:
- en
tags:
- benchmarking
- agent-evaluation
- deterministic-verification
- reinforcement-learning
- legal
- litigation
- long-horizon
- mcp
size_categories:
- n<1K
configs:
- config_name: default
  data_files:
  - split: dev
    path: data/dev.jsonl
---

# Blobfish Litigation Bench

Executable, long-horizon litigation environments for training and evaluating
tool-using agents. **100 tasks, 104-113 verified tool-calling steps each (median 108),
graded by deterministic state-diff — no LLM judge anywhere on the reward path.**

Every task runs inside a stateful law-firm simulation exposed over MCP: nine
litigation systems of record (matters, parties, claims, pleadings, motions, discovery_requests, depositions, exhibits, settlements) behind 47 product-shaped tools. The
agent works a real matter through those systems while reading a mounted file of
6-7 synthetic documents.

> **Simulation only.** Every matter, party, document, attorney and figure is synthetic.

## At a glance

| | |
|---|---|
| Tasks | 100 |
| Verified steps per task | 104-113 (median 108) |
| Distinct scenarios | 10 |
| Unique prompt skeletons | 100/100 |
| Documents per task | 6-7 (docx/eml/pptx/xlsx) |
| Grading | Deterministic state-diff + trace assertions |
| LLM judge | **None** |
| Oracle pass rate | 100/100 (1.00) |

## Why deterministic grading

Rubric-graded agent benchmarks ask a model whether another model's prose
satisfied a criterion. That conflates the grader's judgement with the agent's
capability, and it cannot tell a rubric miss from a model miss.

Here every task ships an executable reference walk, and grading is a diff of
world state before and after plus assertions over the recorded tool trace. A
zero means the agent failed, not that a judge disagreed.

## First results

| Agent | Reward | Conditions failed | Tools missed | Systems never touched |
|---|---|---|---|---|
| Oracle (reference walk) | **1.00** | 0 | 0 | — |
| Claude Sonnet 4.5 · motion to compel | 0.00 | 40 | 32 | calendar, contacts, documents, efiling, matters, time |
| Claude Sonnet 4.5 · case chronology | 0.00 | 29 | 25 | calendar, contacts, matters, time |

The oracle finishes every task. A frontier coding agent, given the same
environment and the same mounted matter file, returns 0.0 on both — and the
deterministic verifier says exactly which tools it never called and which work
products it never created. The failure is not refusal or malformed output: the
agent worked the litigation system and never completed the cross-application
chain.

**Two tasks is not a leaderboard.** These are the first end-to-end runs, not a
scored evaluation, and no confidence interval is claimed. They are reported
because they establish the thing that matters before any leaderboard: the
benchmark discriminates.

## Data schema

| Field | Type | Description |
|---|---|---|
| `task_id` | string | Stable identifier |
| `task_name` | string | Human-readable name |
| `world_id` | string | Environment pointer |
| `prompt` | string | Full agent instruction |
| `context_files` | list | Mounted document manifest (name + role) |
| `rubric` | list | Deterministic assertion names checked by the verifier |
| `gold_output` | string | Reference walk summary (tool sequence) |
| `metadata` | dict | scenario, work_type, posture, complication, phases, steps, docket, court |

## Scenario coverage

- **Motion to Compel Deficient Discovery Responses** — draft (10 variants, 9 phases)
- **Privilege Review and Log for a Rolling Production** — review (10 variants, 8 phases)
- **Deposition Preparation and Exhibit Assembly** — draft (10 variants, 9 phases)
- **Litigation Hold Scoping and Custodian Identification** — advise (10 variants, 8 phases)
- **Opposition to Motion for Summary Judgment** — draft (10 variants, 8 phases)
- **Settlement Valuation and Authority Memorandum** — analyze (10 variants, 7 phases)
- **Production Completeness Audit Against Requests** — compare (10 variants, 8 phases)
- **Motion for Sanctions for Discovery Abuse** — draft (10 variants, 8 phases)
- **Expert Disclosure Review and Exclusion Motion** — analyze (10 variants, 8 phases)
- **Case Chronology Reconstruction from the Record** — analyze (10 variants, 8 phases)

## Splits and release policy

`dev` carries all 100 tasks with their full deterministic assertion sets. The
environment image and reference walks are published alongside so results are
reproducible rather than self-reported.

## Running the tasks

The executable environments are published to the Harbor registry:

```bash
harbor run -d blobfishai/litigation -a <your-agent>
```

## Intended use and licensing

Released CC BY 4.0 for benchmarking and agent training. The corpus is entirely
synthetic and contains no client data. Nothing here is legal advice; every task
carries an attorney-validation limitation that a correct answer must preserve.