Agent Builder

Harvey's Agent Builder isn't a chatbot with a fancy name. It's the platform behind 700,000+ daily AI tasks across 1,300 organizations, with 25,000 custom agents built by firms to automate specific legal workflows. At an $11 billion valuation, Harvey has become the most valuable legal AI company on the planet.

The real story isn't the valuation — it's what firms are actually doing with it. A&O Shearman deployed Harvey agents for antitrust screening, cybersecurity compliance, fund formation, and loan review. These aren't demo-day experiments. They're production workflows handling real client work at one of the world's largest law firms.

What Harvey Agent Builder actually does

Agent Builder lets firms create custom AI agents for specific, repeatable legal tasks. You define the goal, the data sources, the guardrails, and the output format. The agent handles everything in between.

A due diligence agent, for example, doesn't just read a contract. It ingests the full data room, identifies material risks across hundreds of documents, cross-references findings against your deal criteria, and produces a structured report — flagging the provisions that actually matter to your client.

A litigation agent can analyze opposing counsel's filings, identify inconsistencies with prior positions, pull relevant case law, and draft response arguments. Each step feeds the next. No prompt-by-prompt babysitting.

The platform supports 100,000 lawyers running these agents daily. That's not aspirational marketing — it's current throughput. Harvey processes more legal AI tasks in a single day than most firms handle in a year.

A&O Shearman partnership: what BigLaw learned first

A&O Shearman didn't just buy Harvey licenses and hope for the best. They built a structured deployment across four high-value practice areas:

Antitrust screening — agents review transaction documents and flag potential competition law issues across multiple jurisdictions. What used to take a team days now gets a first-pass analysis in hours.

Cybersecurity compliance — agents map contractual obligations against regulatory frameworks (GDPR, state privacy laws, SEC disclosure rules) and identify gaps.

Fund formation — agents review limited partnership agreements, compare terms against market standards, and flag deviations that need partner attention.

Loan review — agents analyze credit agreements, identify non-standard covenants, and benchmark terms against the firm's database of prior deals.

The pattern is consistent: Harvey agents handle the volume work, human lawyers handle the judgment calls. That's the model that actually works.

Harvey vs a chatbot: the technical difference

When the ABA said most "agentic" claims are "marketing dressing on a pumped-up chatbot" (March-April 2026), they weren't wrong about the market. But Harvey's architecture is genuinely different.

A chatbot takes a prompt, generates text, and waits. Harvey's agents operate in autonomous loops: plan the approach, execute sub-tasks, evaluate intermediate results, adjust strategy, and continue until the goal is met. The agent decides which tools to use, which documents to prioritize, and when its own output needs revision.

The 25,000 custom agents built on the platform prove the point. Firms aren't creating 25,000 chatbot prompts — they're building specialized workflows that run independently. Each agent encodes institutional knowledge: your firm's risk thresholds, your clients' preferences, your precedent library.

That's the moat. It's not just Harvey's AI — it's your firm's intelligence layer built on top of it.

Who Harvey works for (and who it doesn't)

Harvey is built for enterprise law firms and legal departments. The pricing reflects that — this isn't a solo practitioner tool. If you're a 5-lawyer shop, the ROI math probably doesn't work yet.

Where Harvey shines: high-volume, high-stakes transactional and litigation work. M&A due diligence, regulatory compliance, contract lifecycle management, large-scale document review. The more documents and the more complexity, the bigger the payoff.

Where it's weaker: novel legal questions with no precedent. Agents are exceptional at pattern matching and analysis across large datasets. They're less reliable when the answer requires creative legal reasoning that doesn't exist in the training data.

The competitive landscape is also worth noting. Harvey's main rivals aren't standing still — CoCounsel launched multi-agent Deep Research in August 2025, and Lexis+ Protege hit GA in February 2026 with 300+ workflows. Harvey's advantage is its head start and platform depth, not a permanent monopoly.

Implementation reality: what firms report

The firms getting value from Harvey share three traits. First, they assigned dedicated teams to agent development — not IT, but practice-group lawyers who understand the workflows they're automating. Linklaters, for example, built a 20-person AI team.

Second, they started narrow. Rather than deploying agents firm-wide, they picked one high-volume workflow (usually contract review or due diligence), proved the ROI, and expanded from there.

Third, they built feedback loops. The best custom agents improve over time because lawyers flag errors, refine parameters, and add edge cases to the agent's instructions. That institutional learning is what separates a tool from a competitive advantage.

The risk is real too. Clio data shows 53% of firms have no AI policy at all. Deploying Harvey agents without governance guardrails — supervision protocols, audit trails, client disclosure policies — creates liability exposure that no amount of efficiency gains can justify.

The Bottom Line: Harvey's Agent Builder is the real deal — 700K daily tasks and 25K custom agents prove it — but it's an enterprise tool that demands enterprise governance to deploy safely.