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| import os | |
| import re | |
| import requests | |
| import json | |
| from typing import Tuple, List | |
| from omegaconf import OmegaConf | |
| from typing import Optional | |
| from pydantic import Field, BaseModel | |
| from vectara_agentic.agent import Agent | |
| from vectara_agentic.tools import ToolsFactory, VectaraToolFactory | |
| from vectara_agentic.tools_catalog import summarize_text | |
| from dotenv import load_dotenv | |
| load_dotenv(override=True) | |
| citation_description = ''' | |
| The citation for a particular case. | |
| Citation must include the volume number, reporter, and first page. For example: 253 P.2d 136. | |
| ''' | |
| def extract_components_from_citation(citation: str) -> Tuple[int, str, int]: | |
| citation_components = citation.split(' ') | |
| volume_num = citation_components[0] | |
| reporter = '-'.join(citation_components[1:-1]).replace('.', '').lower() | |
| first_page = citation_components[-1] | |
| if not volume_num.isdigit(): | |
| raise ValueError("volume number must be a number.") | |
| if not first_page.isdigit(): | |
| raise ValueError("first page number must be a number.") | |
| return int(volume_num), reporter, int(first_page) | |
| def create_assistant_tools(cfg): | |
| def get_opinion_text( | |
| case_citation = Field(description = citation_description), | |
| summarize: Optional[bool] = False | |
| ) -> str: | |
| """ | |
| Given case citation, returns the full opinion/ruling text of the case. | |
| if summarize is True, the text is summarized. | |
| If there is more than one opinion for the case, the type of each opinion is returned with the text, | |
| and the opinions (or their summaries) are separated by semicolons (;) | |
| """ | |
| volume_num, reporter, first_page = extract_components_from_citation(case_citation) | |
| response = requests.get(f"https://static.case.law/{reporter}/{volume_num}/cases/{first_page:04d}-01.json") | |
| if response.status_code != 200: | |
| return "Case not found; please check the citation." | |
| res = json.loads(response.text) | |
| if len(res["casebody"]["opinions"]) == 1: | |
| text = res["casebody"]["opinions"][0]["text"] | |
| output = text if not summarize else summarize_text(text, "law") | |
| else: | |
| output = "" | |
| for opinion in res["casebody"]["opinions"]: | |
| text = opinion["text"] if not summarize else summarize_text(opinion["text"], "law") | |
| output += f"Opinion type: {opinion['type']}, text: {text};" | |
| return output | |
| def get_case_document_pdf( | |
| case_citation = Field(description = citation_description) | |
| ) -> str: | |
| """ | |
| Given a case citation, returns a valid web url to a pdf of the case record | |
| """ | |
| volume_num, reporter, first_page = extract_components_from_citation(case_citation) | |
| response = requests.get(f"https://static.case.law/{reporter}/{volume_num}/cases/{first_page:04d}-01.json") | |
| if response.status_code != 200: | |
| return "Case not found; please check the citation." | |
| res = json.loads(response.text) | |
| page_number = res["first_page_order"] | |
| return f"https://static.case.law/{reporter}/{volume_num}.pdf#page={page_number}" | |
| def get_case_document_page( | |
| case_citation = Field(description = citation_description) | |
| ) -> str: | |
| """ | |
| Given a case citation, returns a valid web url to a page with information about the case. | |
| """ | |
| volume_num, reporter, first_page = extract_components_from_citation(case_citation) | |
| url = f"https://case.law/caselaw/?reporter={reporter}&volume={volume_num}&case={first_page:04d}-01" | |
| response = requests.get(url) | |
| if response.status_code != 200: | |
| return "Case not found; please check the citation." | |
| return url | |
| def get_case_name( | |
| case_citation = Field(description = citation_description) | |
| ) -> Tuple[str, str]: | |
| """ | |
| Given a case citation, returns its name and name abbreviation. | |
| """ | |
| volume_num, reporter, first_page = extract_components_from_citation(case_citation) | |
| response = requests.get(f"https://static.case.law/{reporter}/{volume_num}/cases/{first_page:04d}-01.json") | |
| if response.status_code != 200: | |
| return "Case not found", "Case not found" | |
| res = json.loads(response.text) | |
| return res["name"], res["name_abbreviation"] | |
| def get_cited_cases( | |
| case_citation = Field(description = citation_description) | |
| ) -> List[dict]: | |
| """ | |
| Given a case citation, returns a list of cases that are cited by the opinion of this case. | |
| The output is a list of cases, each a dict with the citation, name and name_abbreviation of the case. | |
| """ | |
| volume_num, reporter, first_page = extract_components_from_citation(case_citation) | |
| response = requests.get(f"https://static.case.law/{reporter}/{volume_num}/cases/{first_page:04d}-01.json") | |
| if response.status_code != 200: | |
| return "Case not found; please check the citation." | |
| res = json.loads(response.text) | |
| citations = res["cites_to"] | |
| res = [] | |
| for citation in citations[:10]: | |
| name, name_abbreviation = get_case_name(citation["cite"]) | |
| res.append({ | |
| "citation": citation["cite"], | |
| "name": name, | |
| "name_abbreviation": name_abbreviation | |
| }) | |
| return res | |
| def validate_url( | |
| url = Field(description = "A web url pointing to case-law document") | |
| ) -> str: | |
| """ | |
| Given a link, returns whether or not the link is valid. | |
| If it is not valid, it should not be used in any output. | |
| """ | |
| pdf_pattern = re.compile(r'^https://static.case.law/.*') | |
| document_pattern = re.compile(r'^https://case.law/caselaw/?reporter=.*') | |
| return "URL is valid" if bool(pdf_pattern.match(url)) | bool(document_pattern.match(url)) else "URL is bad" | |
| class QueryCaselawArgs(BaseModel): | |
| query: str = Field(..., description="The user query.") | |
| citations: Optional[str] = Field(default = None, | |
| description = "The citation of the case. Optional.", | |
| examples = ['253 P.2d 136', '10 Alaska 11', '6 C.M.A. 3']) | |
| vec_factory = VectaraToolFactory(vectara_api_key=cfg.api_key, | |
| vectara_customer_id=cfg.customer_id, | |
| vectara_corpus_id=cfg.corpus_id) | |
| tools_factory = ToolsFactory() | |
| ask_caselaw = vec_factory.create_rag_tool( | |
| tool_name = "ask_caselaw", | |
| tool_description = """ | |
| Returns a response (str) to the user query base on case law in the state of Alaska. | |
| If 'citations' is provided, filters the response based on information from that case. | |
| The response includes metadata about the case such as title/name the ruling, the court, | |
| the decision date, the judges, and the case citation. | |
| You can use case citations from the metadata as input to other tools. | |
| Use this tool for general case law queries. | |
| """, | |
| tool_args_schema = QueryCaselawArgs, | |
| reranker = "multilingual_reranker_v1", rerank_k = 100, | |
| n_sentences_before = 2, n_sentences_after = 2, lambda_val = 0.0, | |
| summary_num_results = 10, | |
| vectara_summarizer = 'vectara-summary-ext-24-05-med-omni', | |
| include_citations = False, | |
| ) | |
| return ( | |
| [tools_factory.create_tool(tool) for tool in [ | |
| get_opinion_text, | |
| get_case_document_pdf, | |
| get_case_document_page, | |
| get_cited_cases, | |
| get_case_name, | |
| validate_url | |
| ]] + | |
| tools_factory.standard_tools() + | |
| tools_factory.legal_tools() + | |
| tools_factory.guardrail_tools() + | |
| [ask_caselaw] | |
| ) | |
| def get_agent_config() -> OmegaConf: | |
| cfg = OmegaConf.create({ | |
| 'customer_id': str(os.environ['VECTARA_CUSTOMER_ID']), | |
| 'corpus_id': str(os.environ['VECTARA_CORPUS_ID']), | |
| 'api_key': str(os.environ['VECTARA_API_KEY']), | |
| 'examples': os.environ.get('QUERY_EXAMPLES', None), | |
| 'demo_name': "legal-agent", | |
| 'demo_welcome': "Welcome to the Legal Assistant demo.", | |
| 'demo_description': "This demo can help you prepare for a court case by providing you information about past court cases in Alaska.", | |
| }) | |
| return cfg | |
| def initialize_agent(_cfg, update_func=None): | |
| legal_assistant_instructions = """ | |
| - You are a helpful legal assistant, with expertise in case law for the state of Alaska. | |
| - The ask_caselaw tool is your primary tools for finding information about cases. | |
| Do not use your own knowledge to answer questions. | |
| - For a query with multiple sub-questions, break down the query into the sub-questions, | |
| and make separate calls to the ask_caselaw tool to answer each sub-question, | |
| then combine the answers to provide a complete response. | |
| - If the ask_caselaw tool responds that it does not have enough information to answer the query, | |
| try to rephrase the query and call the tool again. | |
| - When presenting the output from ask_caselaw tool, | |
| Extract metadata from the tool's response, and respond in this format: | |
| 'On <decision date>, the <court> ruled in <case name> that <judges ruling>. This opinion was authored by <judges>'. | |
| - Citations include 3 components: volume number, reporter, and first page. | |
| Here are some examples: '253 P.2d 136', '10 Alaska 11', '6 C.M.A. 3' | |
| Never use your internal knowledge to contruct or guess what the citation is. | |
| - If two cases have conflicting rulings, assume that the case with the more current ruling date is correct. | |
| - If the response is based on cases that are older than 5 years, make sure to inform the user that the information may be outdated, | |
| since some case opinions may no longer apply in law. | |
| - To summarize the case, use the get_opinion_text with summarize set to True. | |
| - If a user wants to learn more about a case, you can call the get_case_document_pdf tool with the citation to get a valid URL. | |
| If this is unsuccessful, call the get_case_document_page tool instead. | |
| The text displayed with this URL should be the name_abbreviation of the case (DON'T just say the info can be found here). | |
| Don't call the get_case_document_page tool until after you have tried the get_case_document_pdf tool. | |
| Don't provide URLs from any other tools. Do not generate URLs yourself. | |
| - When presenting a URL in your response, use the validate_url tool. | |
| - If a user wants to test their argument, use the ask_caselaw tool to gather information about cases related to their argument | |
| and the critique_as_judge tool to determine whether their argument is sound or has issues that must be corrected. | |
| - Never discuss politics, and always respond politely. | |
| """ | |
| agent = Agent( | |
| tools=create_assistant_tools(_cfg), | |
| topic="Case law in Alaska", | |
| custom_instructions=legal_assistant_instructions, | |
| update_func=update_func | |
| ) | |
| return agent | |