Top 6 of 15 researched candidates
Alternatives to Google Agent Development Kit (ADK)
Find a better fit for what you need. Compare alternatives to Google Agent Development Kit (ADK) with sourced features, strengths and trade-offs side by side.
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Evidence-backed shortlist
Closest researched alternatives to Google Agent Development Kit (ADK)
Ordered by the requirements met, strengths preserved, explicit trade-offs and research coverage. Sponsorship does not enter the order.
- 01
AgentsKit.js
TypeScript foundation for AI agents: runtime, tools, memory, RAG, model adapters and headless chat UI bindings.
From FreeWhy it's on this listWrites code · YesA bundled coder persona implements features from written specs using scoped filesystem and allowlisted shell tools, aimed at real multi-file TypeScript rather than snippets.Evidence ↗
Where it improves on Google Agent Development Kit (ADK)
- +Reviews code · YesTwo review personas ship in the skills package and pair with the GitHub tool, returning approve, request-changes or comment verdicts on a diff someone else wrote.Evidence ↗
- +In your pipeline · YesEval results render as JUnit, Markdown or GitHub annotations that can fail a pull request, and a GitHub Actions snippet shows the wiring.Evidence ↗
Trade-offs against Google Agent Development Kit (ADK)
- −Ships it · PartialThere is no deploy feature; a GitHub Actions integration can trigger workflow_dispatch and the allowlisted shell can run git, so shipping is a pipeline you wire yourself.Evidence ↗
- −Data residency · PartialJurisdiction is yours to choose because nothing is hosted by the vendor, and the router can pin selection to a region, but no residency guarantee is published.Evidence ↗
34/35 researched criteria · 1 not established - 02
LangChain
Open source agent frameworks plus LangSmith, the platform for tracing, evaluating and deploying agents.
From FreeWhy it's on this listWrites code · Yesdcode, the vendor's terminal coding agent, writes and edits files from a natural-language task, showing diffs first.Evidence ↗
Where it improves on Google Agent Development Kit (ADK)
- +Done-for-you service · PartialYou run the software; Enterprise adds LangChain engineers, architectural guidance and team trainings, not delivery of the agent.Evidence ↗
- +In your pipeline · Yesdcode runs headless with turn and time budgets and exit code 124 for CI; Engine opens pull requests on a connected GitHub repo.Evidence ↗
Trade-offs against Google Agent Development Kit (ADK)
- −Ships it · PartialEngine stops at a pull request for human review; agents themselves ship through LangSmith Deployment's 1-Click Deploy, checked for Plus and Enterprise.Evidence ↗
- −Self-hosted · PartialPlatform self-hosting and hybrid are Enterprise-only; Developer and Plus are Cloud, while the open source packages run wherever you install them.Evidence ↗
- −Getting out · PartialBulk trace export to S3 in Parquet is Enterprise-only for accounts opened after 3 August 2026; SDK trace queries stay open to all, and credit expiry is not stated.Evidence ↗
34/35 researched criteria · 1 not established - 03
Agno
Python SDK, open-source AgentOS runtime and hosted control plane for building and operating agents.
From FreeWhy it's on this listWrites code · YesShips a CodingTools toolkit whose documented job is editing files and running commands in a scoped project directory.Evidence ↗
Where it improves on Google Agent Development Kit (ADK)
- +Debugs and fixes · YesBug fixing is a documented pattern: reproduce, patch, rerun the failing tests.Evidence ↗
- +Reviews code · YesCode review over a diff is one of the documented coding-agent patterns.Evidence ↗
Trade-offs against Google Agent Development Kit (ADK)
- −Ships it · PartialPublishing is deliberately outside the default loop; commits, PRs and deploys must be exposed as separately gated tools.Evidence ↗
- −Agent permissions · PartialRuns are unattended unless a tool is marked for approval; then the run pauses in your database until an admin resolves it.Evidence ↗
- −In your pipeline · NoThe enumerated serving surfaces are REST, MCP in Claude/ChatGPT and chat apps; no pull-request or CI surface appears.Evidence ↗
35/35 researched criteria - 04
Letta
Stateful agent harness, cloud and SDK for agents with persistent, git-versioned memory.
From FreeWhy it's on this listWrites code · YesAgents edit and create files in your repository, including from GitHub issues and PRs.Evidence ↗
Where it improves on Google Agent Development Kit (ADK)
- +Debugs and fixes · YesVendor states coding agents debug failures and run test suites.Evidence ↗
- +Reviews code · YesReviews diffs on demand or on every PR via the GitHub action's prompt input.Evidence ↗
Trade-offs against Google Agent Development Kit (ADK)
- −Ships it · PartialCommits, pushes and opens pull requests; it cannot approve PRs and no deployment step is claimed.Evidence ↗
- −MCP server · NoMCP runs inbound only: Letta sessions consume stdio, HTTP and SSE MCP servers; no Letta MCP server is published.Evidence ↗
- −Audit log · NoNo administrative audit log is published; the Enterprise list stops at RBAC, SSO, quotas and dedicated support.Evidence ↗
35/35 researched criteria - 05
Mastra
Open-source TypeScript framework for building AI agents, with a hosted platform for running and observing them.
From FreeWhy it's on this listDone-for-you service · PartialYou run the software, but Mastra sells professional services (Concierge, forward-deployed engineering) and enterprise support covering planning, prototyping and workshops.Evidence ↗
Where it improves on Google Agent Development Kit (ADK)
- +In a browser · YesStudio is a hosted web UI for running agents, editing prompts, annotating traces and building datasets; it runs locally at port 4111 or deployed for the team.Evidence ↗
- +How it meters · YesPlan fee plus consumption metering: observability events, CPU hours, egress, memory tokens, retrieval storage and database rows all have per-unit overage rates. Not per seat.Evidence ↗
Trade-offs against Google Agent Development Kit (ADK)
- −Data residency · PartialSelf-hosted Enterprise keeps traces, prompts and outputs inside your own VPC; for the hosted platform the vendor publishes no region or jurisdiction.Evidence ↗
- −Getting out · PartialYou own your data and can cancel any time, but retention is capped by plan (15 days to 6 months), backups are your responsibility and downgrading may delete data over the new limit.Evidence ↗
35/35 researched criteria - 06
Pydantic AI
Typed Python agent framework: any model, any surface, with a harness for long-running coding and research agents.
From FreeWhy it's on this listWrites code · YesThe first-party Harness package ships Coder, a combined capability giving an agent workspace-rooted read/write/edit/search file tools plus an allowlisted shell.Evidence ↗
Where it improves on Google Agent Development Kit (ADK)
- +Debugs and fixes · YesThe harness is written for exactly this: an agent with files, shell and planning turned loose to fix a codebase over a long session.Evidence ↗
- +In a browser · Yesagent.to_web() and clai web serve a browser chat for any agent; the same page scopes it to local development and points production frontends at the UI event-stream protocols.Evidence ↗
Trade-offs against Google Agent Development Kit (ADK)
- −Ships it · PartialIt stops at the working tree: it runs whatever commands you allowlist in the workspace, and no deploy, release or pull-request step is documented.Evidence ↗
- −Agent permissions · PartialYou choose the ceiling: shell tools take allow/deny lists and default only to a destructive-command denylist, and individual tools can be marked as requiring human approval.Evidence ↗
- −In your pipeline · NoThe surface table enumerates code, terminal, web chat, your frontend, editors and voice; nothing acts on a pull request or in CI, and the roadmap line names messaging channels and API endpoints as what is still missing.Evidence ↗
34/35 researched criteria · 1 not established
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How the shortlist is calculated
Comparable first. We consider listings in the same category as Google Agent Development Kit (ADK) and alternatives previously researched for this page.
Requirements first. We prioritise your selected needs, then shared strengths, fewer documented trade-offs, more complete research and finally alphabetical order.
Unknown remains unknown. Missing evidence is never converted into a benefit or a trade-off. Every improvement shown above comes from the same sourced criterion as the listing.
Independent order. Payment does not affect selection or ranking. Paid placements are labelled Advertisement.
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