{ "data": { "a": { "slug": "letta", "name": "Letta", "vendor": "Letta", "vendorUrl": "https://www.letta.com", "kind": "harness", "category": "agent-harnesses", "summary": "Letta, from the MemGPT team, is an open-source agent harness (formerly Letta Code) for stateful agents that keep memory blocks, skills and conversations across sessions, used from a CLI, chat.letta.com, messaging channels or the Agent SDK, with Letta Cloud.", "url": "https://www.anchorterminal.com/tools/letta", "markdownUrl": "https://www.anchorterminal.com/tools/letta.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/letta.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/letta.json", "dns": "letta.grade.anchorterminal.com", "repo": "https://github.com/letta-ai/letta-code", "license": "Apache-2.0", "transports": [ "stdio" ], "packages": [ { "registry": "npm", "name": "@letta-ai/letta-code" }, { "registry": "pypi", "name": "letta" } ], "auth": "mixed", "authNotes": "Local use needs only the user's own model keys or coding-plan logins through `/connect`. Signing in with Letta (`/login`, OAuth in the browser) stores agents in Letta Cloud and enables remote computers and secrets. Developer plans use Letta API keys.", "pricing": "freemium", "pricingNotes": "Free plan at $0 with bring-your-own keys and limited agents and storage. Pro $20 a month with Letta Auto quotas and up to 20 agents. API plan $20 a month plus $0.10 per active agent a month and $0.00015 a second of tool execution, with LLM usage at token cost.", "priceSummary": "$20 / mo", "where": "local", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the letta-code source, docs.letta.com's llms.txt or the pricing page (checked 2026-11-06).", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": 3793, "npmWeekly": 85863, "pypiWeekly": 2225, "asOf": "2026-11-06" }, "docsUrl": "https://docs.letta.com", "llmsTxt": "https://docs.letta.com/llms.txt", "capabilities": [ "agent.harness", "agent.mcp-client", "agent.multi-agent", "memory.store", "memory.search" ], "tags": [ "open-source", "local", "hosted", "freemium", "apache-2.0", "typescript", "cli", "headless", "telemetry", "llms-txt", "memory" ], "lastRelease": "2026-11-06", "graded": true, "anchor": { "graded": true, "score": 59.7, "grade": "C", "agentReady": false, "rank": 687, "ranked": true, "rankOf": 1510, "categoryRank": 18, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 67, "maintenance": 85, "payments": 60, "reliability": 58, "schema": 70, "security": 35, "transparency": 55 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-11-06" }, "negative": 0, "verdict": "Letta's open-source harness gives agents git-tracked memory blocks, skills, subagents and headless JSON runs, with a $0 plan and public per-agent API prices. It starts in the unrestricted permission mode, defaults to Letta Cloud, sends usage telemetry unless LETTA_CODE_TELEM=0 is set, and the V1 API server the comparisons describe is retired.", "bestFor": "Long-lived coding agents and assistants that keep memory and identity across sessions and machines.", "strengths": [ "Apache-2.0 harness on npm and PyPI with 0.34.42 released on 6 November 2026, and releases most days", "Memory blocks and MemFS keep an agent's context in git, with optional sync to the user's own repository", "Headless runs with `-p` and `--output-format json`, plus a TypeScript Agent SDK and a self-hosted App Server", "Public prices, a $0 plan with bring-your-own keys, and an API plan at $20 a month plus $0.10 per active agent", "Runs locally without signing in, with `letta backend local` or `--backend local`" ], "weaknesses": [ "The default permission mode is `unrestricted`, the renamed `bypassPermissions`, so tool calls aren't confirmed unless the user picks another mode", "Letta Cloud is the default backend, so agent memory and conversations go to Letta's servers unless the user chooses local", "Usage telemetry is on by default, with the LETTA_CODE_TELEM=0 opt-out found only in the source", "The Letta V1 Python API server is retired and unsupported, and the letta-ai/letta repository is now a landing page", "The privacy policy names no legal entity or date and says hosted message data may train future models" ], "agentNotes": [ "Start headless runs with an explicit permission mode such as `standard` or `strict`; the default auto-approves tools", "Pass `--backend local` for work that must stay on the machine, since Letta Cloud is the default", "Set LETTA_CODE_TELEM=0 in unattended runs if usage events must not be sent", "Use `letta -p --output-format json` for scripted runs and parse the JSON, not the terminal output", "Don't plan on the retired V1 REST server or `.af` AgentFile import; both are gone" ], "metrics": { "kind": "local", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "C", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 59.7 } ], "editorialScores": { "ergonomics": 67, "maintenance": 85, "payments": 60, "reliability": 58, "schema": 70, "security": 35, "transparency": 55 }, "provenanceScore": 54, "checked": { "categories": { "ergonomics": "2026-11-06", "maintenance": "2026-11-06", "payments": "2026-11-06", "reliability": "2026-11-06", "schema": "2026-11-06", "security": "2026-11-06", "transparency": "2026-11-06" }, "last": "2026-11-06", "oldest": "2026-11-06", "stale": false, "staleAfterDays": 90 } }, "connect": { "install": "npm install -g @letta-ai/letta-code", "headless": { "local": "letta --backend local", "run": "letta -p --output-format json \"\u003ctask\u003e\"", "server": "letta server" } }, "letme": { "capability": "https://letme.dev/agent.harness", "tool": "https://letme.dev/letta" }, "alsoIn": [ "agent-memory" ], "area": "frameworks", "unitPrices": [ { "item": "Pro plan", "unit": "month", "usd": 20, "note": "Letta Auto quotas, up to 20 agents" }, { "item": "API plan active agent", "unit": "month", "usd": 0.1, "note": "Plus $20 a month base and $0.00015 a second of tool execution" } ], "provenance": { "legalEntity": "", "domain": "letta.com", "domainRegistered": "1997-10-01", "endpointOnVendorDomain": null, "terms": "https://www.letta.com/terms-of-service", "privacy": "https://www.letta.com/privacy-policy", "statusPage": "", "changelog": "https://github.com/letta-ai/letta-code/releases", "securityTxt": "none", "checked": "2026-11-06", "notes": [ "The privacy policy shows no last-updated date and names no legal entity, only Letta. It says hosted message data may be used to train new models and that basic telemetry can be turned off in settings when supported.", "www.letta.com and docs.letta.com robots.txt allow all crawlers.", "RDAP gives letta.com a registration date of 1 October 1997, which predates the company, so the domain was bought later.", "/.well-known/security.txt returns 404. SECURITY.md in letta-ai/letta asks for reports to support@letta.com.", "The terms URL is the conventional path and was not read; the policy reader checks it at landing." ], "score": 54 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/letta.json", "live": { "slug": "letta", "versions": [ { "registry": "github", "name": "letta-ai/letta-code", "version": "v0.34.43", "released": "2026-11-06", "seenAt": "2026-11-06T23:39:39.434291816Z" }, { "registry": "npm", "name": "@letta-ai/letta-code", "version": "0.34.43", "seenAt": "2026-11-06T23:39:38.413416142Z" }, { "registry": "pypi", "name": "letta", "version": "0.34.12", "released": "2026-10-12", "seenAt": "2026-11-06T23:39:39.241816797Z" } ], "githubStars": 3794, "npmWeekly": 85863, "pypiWeekly": 2225, "securityTxt": { "url": "https://letta.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-11-07T16:01:02.768002207Z" }, "llmsTxt": { "url": "https://docs.letta.com/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-11-07T15:32:52.28674296Z" }, "pages": [ { "url": "https://www.letta.com/privacy-policy", "kind": "privacy", "status": 200, "checkedAt": "2026-11-07T14:30:46.549817082Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "947a68f3e3a0" }, { "url": "https://www.letta.com/terms-of-service", "kind": "terms", "status": 200, "checkedAt": "2026-11-07T14:30:48.740250784Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "63f31d6ebfb8" } ], "updatedAt": "2026-11-07T16:01:02.768002207Z" } }, "answer": "Letta scores 59.7 (C) on agent readiness against Vibe-Trading's 57.8 (C), and leads in 2 of 7 scored categories. Vibe-Trading leads on reliability and security \u0026 auth.", "b": { "slug": "vibe-trading", "name": "Vibe-Trading", "vendor": "HKUDS", "vendorUrl": "https://vibetrading.wiki", "kind": "harness", "category": "agent-harnesses", "summary": "Vibe-Trading is an open-source, self-hosted finance research agent from HKUDS. It turns plain-English questions into market data pulls, strategy code and backtests, through a CLI, a web UI, chat apps or its MCP server.", "url": "https://www.anchorterminal.com/tools/vibe-trading", "markdownUrl": "https://www.anchorterminal.com/tools/vibe-trading.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/vibe-trading.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/vibe-trading.json", "dns": "vibe-trading.grade.anchorterminal.com", "repo": "https://github.com/HKUDS/Vibe-Trading", "license": "MIT", "transports": [ "stdio", "streamable-http", "sse" ], "packages": [ { "registry": "pypi", "name": "vibe-trading-ai" } ], "auth": "none", "authNotes": "No account with the project. The owner supplies a model provider key in `agent/.env`, or uses Ollama, a ChatGPT OAuth sign-in for OpenAI Codex, a GitHub Copilot login or a local Claude Code login. The API server answers loopback clients without a key; any other client needs `API_AUTH_KEY` as `Authorization: Bearer \u003ckey\u003e`. The MCP server's HTTP transport binds 127.0.0.1 with a Host and Origin allow-list and no token. Broker connector credentials are stored in the OS keyring by `vibe-trading connector setup` (https://github.com/HKUDS/Vibe-Trading/blob/main/README.md).", "pricing": "free", "pricingNotes": "Free under the MIT licence, with nothing to buy from the project. The owner pays the model provider, or nothing with a local model through Ollama. 29 market-data sources are built in and most need no key. QVeris, an optional paid data marketplace, is a third party and is reached only in paid mode; the README carries a QVeris referral link and discloses it (checked 2026-10-25).", "priceSummary": "Free · OSS", "where": "local", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the README, the docs or the source at v0.1.18 (checked 2026-10-25).", "endpoints": [] }, "toolCount": 82, "popularity": { "githubStars": 36500, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-10-25" }, "docsUrl": "https://vibetrading.wiki/docs/", "capabilities": [ "agent.harness", "agent.multi-agent", "agent.mcp-client", "data.markets", "market.crypto", "market.news", "assistant.messaging", "assistant.proactive" ], "tags": [ "open-source", "self-hosted", "local", "free", "python", "mit", "mcp", "cli", "harness", "docker", "no-card", "no-sandbox", "pre-1.0", "beta" ], "lastRelease": "2026-10-21", "graded": true, "anchor": { "graded": true, "score": 57.8, "grade": "C", "agentReady": false, "rank": 781, "ranked": true, "rankOf": 1510, "categoryRank": 23, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 67, "maintenance": 82, "payments": 60, "reliability": 63, "schema": 72, "security": 70, "transparency": 53 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-11-02" }, "negative": -9, "negativeNotes": [ "2026-10-02. GHSA-v2f8-6655-7grj (CVE-2026-114108, critical). In 0.1.0 to 0.1.6 the API server answered every client without authentication when `API_AUTH_KEY` was unset, the shipped default, with the Docker container running as root on 0.0.0.0:8899, which the advisory chains to remote code execution. Fixed in 0.1.7 of 6 May 2026 and published five months later, -2 while under two months old (1 from 3 December). https://github.com/HKUDS/Vibe-Trading/security/advisories/GHSA-v2f8-6655-7grj", "2026-10-02. GHSA-jqmf-mx4f-hfr6 (CVE-2026-114107, critical). Shell and code injection in the LLM-callable `bash`, `background_run` and backtest tools, and SSRF in `read_url`, reachable through the unauthenticated API or prompt injection in a processed document, in 0.1.0 to 0.1.6. Fixed in the same 0.1.7 release, -2 while under two months old (1 from 3 December). https://github.com/HKUDS/Vibe-Trading/security/advisories/GHSA-jqmf-mx4f-hfr6", "2026-10-02. GHSA-5rmq-chc7-m22f (CVE-2026-114106, high). `read_document` read any file the process could reach and `safe_user_path()` accepted the whole home directory, in 0.1.0 to 0.1.6. Fixed in 0.1.7, -2 while under two months old (1 from 3 December). https://github.com/HKUDS/Vibe-Trading/security/advisories/GHSA-5rmq-chc7-m22f", "2026-09-29. Released fixes of the listing's own described flaws with no advisory. v0.1.16 carries \"fix(security): verify email TLS certs and guard settings-write routes\" (2242c412). The Email channel in 0.1.15 and earlier sent the mailbox password over implicit SSL without checking the certificate. The same commit closed a cross-site route that could steer the stored password to another host through POST /channels/email/test, a route added after 0.1.15 and never in a release without the fix. The commit cites no GHSA id, OSV holds no record, and the changelog entry isn't an advisory. One term (https://github.com/HKUDS/Vibe-Trading/commit/2242c412cab96cde2490c443199d003d64b13b41). -3" ], "verdict": "Vibe-Trading runs on the owner's machine under the MIT licence, ships near-daily fixes with a dated changelog, and keeps order tools out of its MCP server, with live orders gated by an owner-committed mandate. Three advisories, two critical, covered versions before 0.1.7, a 0.1.16 credential fix got no advisory, and the local CLI runs shell commands without asking.", "bestFor": "A person or a pipeline that wants a ready-made finance research agent over free market data, with backtests, swarm reviews and exports, run on their own machine or used as an MCP server by another agent.", "strengths": [ "MIT licence, runs on the owner's machine, and no telemetry code was found in the source at v0.1.18", "No order-placing or order-cancelling tool is exposed over MCP, and shell tools are off on every MCP transport by default", "Live orders need an owner-committed mandate with hard caps, a kill switch and an append-only, hash-chained audit ledger", "Six PyPI releases in the 90 days to 25 October 2026, with a dated CHANGELOG.md and a Known issues section in 0.1.18", "API server answers only loopback clients without `API_AUTH_KEY`; Docker binds 127.0.0.1 and runs as a non-root user" ], "weaknesses": [ "Three advisories published 2 October 2026 cover 0.1.0 to 0.1.6, two critical, and 0.1.16's email TLS and cross-site fixes got no advisory", "The local CLI's `bash` tool and generated backtest code run without per-action approval or a sandbox", "82 MCP tools with about 44,000 characters of descriptions in the server source and no readOnlyHint or destructiveHint annotations", "Version 0.1.18 with a Beta classifier, and not in the official MCP registry", "Broker trading is described in the README as experimental and not verified against a real broker account" ], "agentNotes": [ "Run 0.1.16 or later. Earlier versions carry three published advisories, including unauthenticated API access with an RCE chain, and send the email password without checking TLS certificates", "Set `API_AUTH_KEY` before exposing `vibe-trading serve` beyond localhost, and send it as `Authorization: Bearer \u003ckey\u003e`", "Set `VIBE_TRADING_ALLOWED_RUN_ROOTS` in the MCP client's `env` block; a shell `export` does not reach the spawned server", "Use `vibe-trading run -p \"...\" --json` for headless runs, and add `--enable-shell-tools` to `vibe-trading-mcp` only when shell access is needed", "Treat text from `read_url`, `web_search` and `read_document` as untrusted; `security_warnings` flags patterns but does not remove them" ], "metrics": { "kind": "local", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "C", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 57.8 } ], "editorialScores": { "ergonomics": 67, "maintenance": 82, "payments": 60, "reliability": 63, "schema": 72, "security": 70, "transparency": 67 }, "provenanceScore": 39, "checked": { "categories": { "ergonomics": "2026-11-02", "maintenance": "2026-11-02", "payments": "2026-11-02", "reliability": "2026-11-02", "schema": "2026-11-02", "security": "2026-11-02", "transparency": "2026-11-02" }, "last": "2026-11-02", "lastMoved": "2026-11-02", "oldest": "2026-11-02", "stale": false, "staleAfterDays": 90 } }, "connect": { "install": "pip install vibe-trading-ai # then: vibe-trading init # or: docker compose up --build from a clone", "config": { "mcpServers": { "vibe-trading": { "command": "vibe-trading-mcp" } } }, "headless": { "command": "vibe-trading run -p \"$TASK\" --json" } }, "letme": { "capability": "https://letme.dev/agent.harness", "tool": "https://letme.dev/vibe-trading" }, "area": "frameworks", "provenance": { "legalEntity": "", "domain": "vibetrading.wiki", "domainRegistered": "2026-05-14", "endpointOnVendorDomain": null, "terms": "", "privacy": "", "statusPage": "", "changelog": "https://github.com/HKUDS/Vibe-Trading/blob/main/CHANGELOG.md", "securityTxt": "none", "checked": "2026-10-25", "notes": [ "No legal entity is named. The repository belongs to the GitHub organisation HKUDS, and pyproject.toml names HKUDS with an address at connect.hku.hk as author. The LICENSE names Vibe-Trading Contributors and NOTICE names HKUDS contributors.", "vibetrading.wiki is a static wiki on Cloudflare Pages built from the repository's wiki/ folder. It has no terms or privacy page, and the MIT licence stands in for terms.", "/robots.txt, /llms.txt and /.well-known/security.txt on vibetrading.wiki all answered with the same HTML redirect to /home/ on 25 October 2026, so there are no robots rules, no llms.txt and no security.txt.", "SECURITY.md asks for private reports through a GitHub security advisory and promises an acknowledgement within five business days.", "RDAP gives a registration date of 14 May 2026 for vibetrading.wiki. The README dates the wiki's launch to the same day.", "There is no hosted endpoint. The API and MCP server answer on the owner's own host." ], "score": 39 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/vibe-trading.json", "live": { "slug": "vibe-trading", "versions": [ { "registry": "github", "name": "HKUDS/Vibe-Trading", "version": "v0.1.19", "released": "2026-11-05", "seenAt": "2026-11-07T00:15:44.102050532Z" }, { "registry": "pypi", "name": "vibe-trading-ai", "version": "0.1.19", "released": "2026-11-05", "seenAt": "2026-11-07T00:15:43.819733725Z" } ], "githubStars": 37792, "pypiWeekly": 2517, "securityTxt": { "url": "https://vibetrading.wiki/.well-known/security.txt", "state": "none", "checkedAt": "2026-11-07T15:59:54.85620888Z" }, "domain": { "domain": "vibetrading.wiki", "registered": "2026-05-14", "source": "https://rdap.nic.wiki/domain/vibetrading.wiki", "checkedAt": "2026-11-01T14:23:54.063864064Z" }, "pages": [ { "url": "https://raw.githubusercontent.com/HKUDS/Vibe-Trading/main/CHANGELOG.md", "kind": "deprecations", "status": 304, "checkedAt": "2026-11-07T14:18:29.2707234Z", "changedAt": "2026-11-05T13:02:55.916690108Z", "fingerprint": "558272c978a5" } ], "github": { "repo": "hkuds/vibe-trading", "checkedAt": "2026-11-02T08:25:25.970880064Z", "stars": 37416, "archived": false, "issuesEnabled": true, "pushedAt": "2026-11-01T19:12:28Z", "openIssues": 9, "openPRs": 15, "issuesOpened90d": 248, "issuesClosed90d": 249, "prsMerged90d": 740, "ci": { "branch": "main", "runs": 50, "success": 44, "failure": 4, "other": 2, "latest": "success", "latestAt": "2026-11-01T19:23:53Z" }, "advisories": [ { "ghsa": "GHSA-v2f8-6655-7grj", "severity": "critical", "published": "2026-07-29T12:13:09Z" }, { "ghsa": "GHSA-5rmq-chc7-m22f", "severity": "high", "published": "2026-07-29T12:07:20Z" }, { "ghsa": "GHSA-jqmf-mx4f-hfr6", "severity": "critical", "published": "2026-07-29T12:07:19Z" } ], "replies": { "sampled": 25, "unanswered": 3, "medianDays": 0.9 } }, "updatedAt": "2026-11-07T15:59:54.85620888Z" } }, "edges": [ { "by": 35, "category": "security", "leads": "vibe-trading", "name": "Security \u0026 auth", "reasons": { "a": "Harness reading of the framework checklist, as for the other harnesses. 30 for what leaves the machine by default, 20 for approvals and sandboxing, 15 for injection posture, 15 for audit and 20 for the security programme. Letta Cloud is the default backend, so agent state and conversations go to Letta's servers, and telemetry is on by default (10 of 30). The default permission mode is `unrestricted`; `standard`, `acceptEdits` and `strict` are opt-in, and cloud sandboxes exist for remote work (4 of 20). No prompt-injection guidance found for fetched pages or channel messages (5 of 15). Conversation search and git history of memory give an operator a record of what the agent saw and changed (10 of 15). SECURITY.md routes reports to support@letta.com and scopes out the retired server; no security.txt, bounty or certification found (6 of 20). Total 35.", "b": "Harness reading used for nanobot and goose. 30 for what leaves the machine by default, 20 for approvals and sandboxing, 15 for prompt-injection posture, 15 for audit and 20 for the security programme. No telemetry code was found in the source at v0.1.18, and the only call to PyPI is the owner-run `vibe-trading update`. The API answers only loopback clients without `API_AUTH_KEY`, Docker binds 127.0.0.1 and runs as user `vibe`, and the MCP HTTP transport binds 127.0.0.1 with a Host and Origin allow-list against DNS rebinding but no token. Broker keys go to the OS keyring; model keys sit in `agent/.env` in clear text. The docs carry no statement that nothing is collected (24). Live orders need a mandate that only the owner commits through the web UI or API, with hard caps and a kill switch, and an optional TAP mode waits for human approval of each Alpaca write. No order tool is exposed over MCP, and shell tools are off on the API and every MCP transport unless enabled. The local CLI runs `bash` and file writes without asking, and generated backtest code runs as a network-capable subprocess with a narrowed environment and no sandbox (13). Reader and search tools add warning-only `security_warnings` from regex rules, and external MCP tool hints are treated as untrusted in the source. The `claude-cli` provider's tool filters are described as convenience filters, not a boundary (9). A live-action ledger written append-only with a hash-chained copy, run cards with hashed execution records, tool traces and per-run token usage (13). SECURITY.md with private advisory reporting and a five-business-day acknowledgement. Three advisories were published on 2 October 2026 with CVE identifiers, five months after the 0.1.7 fix, while the email TLS and cross-site settings fixes in 0.1.16 got none. No security.txt and no bounty (11). 24+13+9+13+11 = 70." }, "scores": { "a": 35, "b": 70 } }, { "by": 5, "category": "reliability", "leads": "vibe-trading", "name": "Reliability", "reasons": { "a": "Local-software lines, read for the harness. `@letta-ai/letta-code` on npm with Node.js 22.19 or newer, and PyPI wheels for glibc Linux, macOS 14 and Windows x64 with Python 3.9 or newer stated (20). ci.yml, nightly update smoke tests and Telegram live smoke tests exist, but GitHub's API answered with a rate limit, so run results were unread (15 of 25, unchecked). 332 open issues and pull requests, mostly pull requests; recent bug reports such as recall reading the wrong conversation have no reply yet (15 of 25). 398 tags at 0.34.x with release notes on GitHub, no changelog file, and breaking removals such as AgentFile announced in the README (8 of 15). Pre-1.0 (0). Total 58.", "b": "Read with the local-software lines, as for nanobot and Agent Zero, since the owner runs it. `vibe-trading-ai` installs from PyPI for Python 3.11 or newer, with classifiers for 3.11 to 3.13, and a Docker Compose setup ships in the repository (20). A CI workflow runs the test suite on pushes and pull requests to main, with hash-locked dependency checks on Linux, macOS and Windows, and the repository holds 961 test files. Whether the latest runs on main passed couldn't be read, because GitHub's Actions pages weren't reachable (15 of 25). The repository page showed 7 open issues and 57 open pull requests on 25 October 2026, per that check (GitHub's pages answer 403 on 2 November), against 771 commits in the 30 days to 2 November, and the 0.1.18 notes list two known issues already fixed on main. Issue threads weren't read (18 of 25). CHANGELOG.md says it follows Semantic Versioning, with dated entries from 0.1.8, a Known issues section and an upgrade note for the LangChain 1.x move in 0.1.10, but on 0.x breaking changes ride in minor versions and there is no Breaking section (10 of 15). Version 0.1.18 with the classifier Development Status 4, Beta (0)." }, "scores": { "a": 58, "b": 63 } } ], "facts": [ { "a": "Agent harness", "b": "Agent harness", "name": "Kind" }, { "a": "Letta", "b": "HKUDS", "name": "Vendor" }, { "a": "no (local only)", "b": "no (local only)", "name": "Hosted endpoint" }, { "a": "stdio", "b": "stdio, Streamable HTTP, SSE (legacy)", "name": "Transports" }, { "a": "OAuth or key", "b": "None", "name": "Auth" }, { "a": "Freemium", "b": "Free", "name": "Pricing" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "Apache-2.0", "b": "MIT", "name": "Licence" }, { "a": "none", "b": "82", "name": "Tools exposed" }, { "a": "no", "b": "no", "name": "Read-only variant documented" }, { "a": "yes", "b": "no", "name": "llms.txt" }, { "a": "2026-11-06", "b": "2026-10-21", "name": "Last release" }, { "a": "no date given", "b": "no document linked", "name": "Terms last updated" }, { "a": "no date given", "b": "no document linked", "name": "Privacy policy last updated" }, { "a": "not found in the text", "b": "not read yet", "name": "Customer content may train models" }, { "a": "not found in the text", "b": "not read yet", "name": "Terms restrict automated access" }, { "a": "not found in the text", "b": "not read yet", "name": "Terms restrict benchmarking" }, { "a": "not found in the text", "b": "not read yet", "name": "Terms or service can change without notice" }, { "a": "yes", "b": "not read yet", "name": "Arbitration or class-action waiver" }, { "a": "3.8k stars, 86k npm/wk, 2.2k PyPI/wk", "b": "37k stars", "name": "Popularity" } ], "faq": [ { "answer": "Letta scores 59.7 (C) on agent readiness against Vibe-Trading's 57.8 (C), and leads in 2 of 7 scored categories. Vibe-Trading leads on reliability and security \u0026 auth.", "question": "Which is better for AI agents, Letta or Vibe-Trading?" }, { "answer": "Yes. Letta is open source (Apache-2.0). Vibe-Trading is open source (MIT).", "question": "Are Letta and Vibe-Trading open source?" } ], "goodFor": [ { "aheadOn": null, "also": [ "No incidents deducted, where Vibe-Trading loses 9 points for them" ], "goodFor": "Long-lived coding agents and assistants that keep memory and identity across sessions and machines.", "slug": "letta", "watchFor": "The default permission mode is `unrestricted`, the renamed `bypassPermissions`, so tool calls aren't confirmed unless the user picks another mode" }, { "aheadOn": [ "Reliability, 63 against 58", "Security \u0026 auth, 70 against 35" ], "also": [ "No key needed to call it", "Free to start without a card" ], "goodFor": "A person or a pipeline that wants a ready-made finance research agent over free market data, with backtests, swarm reviews and exports, run on their own machine or used as an MCP server by another agent.", "slug": "vibe-trading", "watchFor": "Three advisories published 2 October 2026 cover 0.1.0 to 0.1.6, two critical, and 0.1.16's email TLS and cross-site fixes got no advisory" } ], "history": { "letta": null, "vibe-trading": [ { "causes": [ "correction" ], "date": "2026-11-02", "delta": -5, "from": 62.8, "fromGrade": "B", "to": 57.8, "toGrade": "C" }, { "causes": [ "evidence" ], "date": "2026-10-28", "delta": 0.4, "from": 62.4, "fromGrade": "B", "to": 62.8, "toGrade": "B" }, { "causes": [ "evidence" ], "date": "2026-10-27", "delta": 0.2, "from": 62.2, "fromGrade": "B", "to": 62.4, "toGrade": "B" } ] }, "job": { "capability": "agent.harness", "name": "Agent harnesses" }, "others": [ { "json": "https://www.anchorterminal.com/compare/agent-zero-vs-letta.json", "title": "Agent Zero vs Letta", "url": "https://www.anchorterminal.com/compare/agent-zero-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/agent-zero-vs-vibe-trading.json", "title": "Agent Zero vs Vibe-Trading", "url": "https://www.anchorterminal.com/compare/agent-zero-vs-vibe-trading" }, { "json": 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Vibe-Trading", "url": "https://www.anchorterminal.com/compare/antigravity-cli-vs-vibe-trading" }, { "json": "https://www.anchorterminal.com/compare/auggie-vs-letta.json", "title": "Auggie CLI vs Letta", "url": "https://www.anchorterminal.com/compare/auggie-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/auggie-vs-vibe-trading.json", "title": "Auggie CLI vs Vibe-Trading", "url": "https://www.anchorterminal.com/compare/auggie-vs-vibe-trading" }, { "json": "https://www.anchorterminal.com/compare/axlr-vs-letta.json", "title": "AXLR vs Letta", "url": "https://www.anchorterminal.com/compare/axlr-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/axlr-vs-vibe-trading.json", "title": "AXLR vs Vibe-Trading", "url": "https://www.anchorterminal.com/compare/axlr-vs-vibe-trading" }, { "json": "https://www.anchorterminal.com/compare/claude-code-vs-letta.json", "title": "Claude Code vs Letta", "url": "https://www.anchorterminal.com/compare/claude-code-vs-letta" }, { "json": 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"url": "https://www.anchorterminal.com/compare/deepseek-harness-vs-vibe-trading" }, { "json": "https://www.anchorterminal.com/compare/deepseek-superagent-vs-letta.json", "title": "dsh-superagent (DeepSeek) vs Letta", "url": "https://www.anchorterminal.com/compare/deepseek-superagent-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/deepseek-superagent-vs-vibe-trading.json", "title": "dsh-superagent (DeepSeek) vs Vibe-Trading", "url": "https://www.anchorterminal.com/compare/deepseek-superagent-vs-vibe-trading" }, { "json": "https://www.anchorterminal.com/compare/devin-vs-letta.json", "title": "Devin vs Letta", "url": "https://www.anchorterminal.com/compare/devin-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/devin-vs-vibe-trading.json", "title": "Devin vs Vibe-Trading", "url": "https://www.anchorterminal.com/compare/devin-vs-vibe-trading" }, { "json": "https://www.anchorterminal.com/compare/droid-cli-vs-letta.json", "title": "Droid CLI vs Letta", "url": 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"https://www.anchorterminal.com/compare/paseo-vs-vibe-trading" }, { "json": "https://www.anchorterminal.com/compare/prime-agent-vs-vibe-trading.json", "title": "Prime Agent vs Vibe-Trading", "url": "https://www.anchorterminal.com/compare/prime-agent-vs-vibe-trading" }, { "json": "https://www.anchorterminal.com/compare/qoder-cli-vs-vibe-trading.json", "title": "Qoder CLI vs Vibe-Trading", "url": "https://www.anchorterminal.com/compare/qoder-cli-vs-vibe-trading" }, { "json": "https://www.anchorterminal.com/compare/qwen-code-vs-vibe-trading.json", "title": "Qwen Code vs Vibe-Trading", "url": "https://www.anchorterminal.com/compare/qwen-code-vs-vibe-trading" }, { "json": "https://www.anchorterminal.com/compare/reflection-mirror-vs-vibe-trading.json", "title": "Mirror CLI vs Vibe-Trading", "url": "https://www.anchorterminal.com/compare/reflection-mirror-vs-vibe-trading" }, { "json": "https://www.anchorterminal.com/compare/rovo-dev-cli-vs-vibe-trading.json", "title": "Rovo Dev CLI vs Vibe-Trading", "url": "https://www.anchorterminal.com/compare/rovo-dev-cli-vs-vibe-trading" }, { "json": "https://www.anchorterminal.com/compare/sculptor-vs-vibe-trading.json", "title": "Sculptor vs Vibe-Trading", "url": "https://www.anchorterminal.com/compare/sculptor-vs-vibe-trading" }, { "json": "https://www.anchorterminal.com/compare/t3-code-vs-vibe-trading.json", "title": "T3 Code vs Vibe-Trading", "url": "https://www.anchorterminal.com/compare/t3-code-vs-vibe-trading" }, { "json": "https://www.anchorterminal.com/compare/traycer-vs-vibe-trading.json", "title": "Traycer vs Vibe-Trading", "url": "https://www.anchorterminal.com/compare/traycer-vs-vibe-trading" }, { "json": "https://www.anchorterminal.com/compare/verdent-vs-vibe-trading.json", "title": "Verdent vs Vibe-Trading", "url": "https://www.anchorterminal.com/compare/verdent-vs-vibe-trading" }, { "json": "https://www.anchorterminal.com/compare/vibe-trading-vs-warp.json", "title": "Vibe-Trading vs Warp (Warp Agent CLI and the Oz Agent API)", "url": "https://www.anchorterminal.com/compare/vibe-trading-vs-warp" }, { "json": "https://www.anchorterminal.com/compare/clawboo-vs-letta.json", "title": "Clawboo vs Letta", "url": "https://www.anchorterminal.com/compare/clawboo-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/clawboo-vs-vibe-trading.json", "title": "Clawboo vs Vibe-Trading", "url": "https://www.anchorterminal.com/compare/clawboo-vs-vibe-trading" }, { "json": "https://www.anchorterminal.com/compare/cli-manager-vs-letta.json", "title": "CLI Manager vs Letta", "url": "https://www.anchorterminal.com/compare/cli-manager-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/cli-manager-vs-vibe-trading.json", "title": "CLI Manager vs Vibe-Trading", "url": "https://www.anchorterminal.com/compare/cli-manager-vs-vibe-trading" }, { "json": "https://www.anchorterminal.com/compare/harness-autonomous-vs-letta.json", "title": "Harness vs Letta", "url": "https://www.anchorterminal.com/compare/harness-autonomous-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/harness-autonomous-vs-vibe-trading.json", "title": "Harness vs Vibe-Trading", "url": "https://www.anchorterminal.com/compare/harness-autonomous-vs-vibe-trading" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-paperclip.json", "title": "Letta vs Paperclip", "url": "https://www.anchorterminal.com/compare/letta-vs-paperclip" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-parallax-agents.json", "title": "Letta vs Parallax", "url": "https://www.anchorterminal.com/compare/letta-vs-parallax-agents" }, { "json": "https://www.anchorterminal.com/compare/openmausbot-vs-vibe-trading.json", "title": "OpenMausBot vs Vibe-Trading", "url": "https://www.anchorterminal.com/compare/openmausbot-vs-vibe-trading" }, { "json": "https://www.anchorterminal.com/compare/paperclip-vs-vibe-trading.json", "title": "Paperclip vs Vibe-Trading", "url": "https://www.anchorterminal.com/compare/paperclip-vs-vibe-trading" }, { "json": "https://www.anchorterminal.com/compare/parallax-agents-vs-vibe-trading.json", "title": "Parallax vs Vibe-Trading", "url": "https://www.anchorterminal.com/compare/parallax-agents-vs-vibe-trading" }, { "json": "https://www.anchorterminal.com/compare/unstoppable-vs-vibe-trading.json", "title": "Unstoppable vs Vibe-Trading", "url": "https://www.anchorterminal.com/compare/unstoppable-vs-vibe-trading" } ], "panel": null, "scores": [ { "by": 5, "edge": "vibe-trading", "key": "reliability", "letta": 58, "name": "Reliability", "vibe-trading": 63, "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 2, "edge": "vibe-trading", "key": "schema", "letta": 70, "name": "Schema \u0026 documentation", "vibe-trading": 72, "weight": 13 }, { "by": 0, "edge": "", "key": "ergonomics", "letta": 67, "name": "Agent ergonomics", "vibe-trading": 67, "weight": 13 }, { "by": 35, "edge": "vibe-trading", "key": "security", "letta": 35, "name": "Security \u0026 auth", "vibe-trading": 70, "weight": 14 }, { "by": 0, "edge": "", "key": "payments", "letta": 60, "name": "Payments \u0026 pricing", "vibe-trading": 60, "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 3, "edge": "letta", "key": "maintenance", "letta": 85, "name": "Maintenance \u0026 community", "vibe-trading": 82, "weight": 7 }, { "by": 2, "edge": "letta", "key": "transparency", "letta": 55, "name": "Transparency \u0026 trust", "vibe-trading": 53, "weight": 7 } ], "summary": "Letta scores 59.7 (C) on agent readiness against Vibe-Trading's 57.8 (C), and leads in 2 of 7 scored categories. Vibe-Trading leads on reliability and security \u0026 auth. Both do agent harnesses.", "tasks": null, "tutorials": [], "verdicts": { "letta": "Letta's open-source harness gives agents git-tracked memory blocks, skills, subagents and headless JSON runs, with a $0 plan and public per-agent API prices. It starts in the unrestricted permission mode, defaults to Letta Cloud, sends usage telemetry unless LETTA_CODE_TELEM=0 is set, and the V1 API server the comparisons describe is retired.", "vibe-trading": "Vibe-Trading runs on the owner's machine under the MIT licence, ships near-daily fixes with a dated changelog, and keeps order tools out of its MCP server, with live orders gated by an owner-committed mandate. Three advisories, two critical, covered versions before 0.1.7, a 0.1.16 credential fix got no advisory, and the local CLI runs shell commands without asking." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/letta-vs-vibe-trading", "json": "https://www.anchorterminal.com/compare/letta-vs-vibe-trading.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/letta-vs-vibe-trading.md", "mcp": "https://www.anchorterminal.com/mcp", "slim": "https://www.anchorterminal.com/compare/letta-vs-vibe-trading.min.md" }, "markdown": "Letta scores 59.7 (C) on agent readiness against Vibe-Trading's 57.8 (C), and leads in 2 of 7 scored categories. Vibe-Trading leads on reliability and security \u0026 auth. Both do agent harnesses.\n\n- Letta: grade C, 59.7/100, rank #687 of 1510. Markdown https://www.anchorterminal.com/tools/letta.md · JSON https://www.anchorterminal.com/api/v1/tools/letta.json\n- Vibe-Trading: grade C, 57.8/100, rank #781 of 1510. Markdown https://www.anchorterminal.com/tools/vibe-trading.md · JSON https://www.anchorterminal.com/api/v1/tools/vibe-trading.json\n- Best agent harnesses and coding agents: https://www.anchorterminal.com/best/agent-harnesses/index.md\n- All 1500 harnesses comparisons: https://www.anchorterminal.com/compare/agent-harnesses/index.md\n- Best memory layers for AI agents: https://www.anchorterminal.com/best/agent-memory/index.md\n- All 353 memory comparisons: https://www.anchorterminal.com/compare/agent-memory/index.md\n\n## Which one, for what\n\n### Letta (C)\n\nGood for: Long-lived coding agents and assistants that keep memory and identity across sessions and machines.\n\nAlso in its favour:\n- No incidents deducted, where Vibe-Trading loses 9 points for them\n\nWatch for: The default permission mode is `unrestricted`, the renamed `bypassPermissions`, so tool calls aren't confirmed unless the user picks another mode\n\n### Vibe-Trading (C)\n\nGood for: A person or a pipeline that wants a ready-made finance research agent over free market data, with backtests, swarm reviews and exports, run on their own machine or used as an MCP server by another agent.\n\nAhead on:\n- Reliability, 63 against 58\n- Security \u0026 auth, 70 against 35\n\nAlso in its favour:\n- No key needed to call it\n- Free to start without a card\n\nWatch for: Three advisories published 2 October 2026 cover 0.1.0 to 0.1.6, two critical, and 0.1.16's email TLS and cross-site fixes got no advisory\n\n\n## Why the edge\n\n### Security \u0026 auth: Vibe-Trading +35\n\n- Letta (35): Harness reading of the framework checklist, as for the other harnesses. 30 for what leaves the machine by default, 20 for approvals and sandboxing, 15 for injection posture, 15 for audit and 20 for the security programme. Letta Cloud is the default backend, so agent state and conversations go to Letta's servers, and telemetry is on by default (10 of 30). The default permission mode is `unrestricted`; `standard`, `acceptEdits` and `strict` are opt-in, and cloud sandboxes exist for remote work (4 of 20). No prompt-injection guidance found for fetched pages or channel messages (5 of 15). Conversation search and git history of memory give an operator a record of what the agent saw and changed (10 of 15). SECURITY.md routes reports to support@letta.com and scopes out the retired server; no security.txt, bounty or certification found (6 of 20). Total 35.\n- Vibe-Trading (70): Harness reading used for nanobot and goose. 30 for what leaves the machine by default, 20 for approvals and sandboxing, 15 for prompt-injection posture, 15 for audit and 20 for the security programme. No telemetry code was found in the source at v0.1.18, and the only call to PyPI is the owner-run `vibe-trading update`. The API answers only loopback clients without `API_AUTH_KEY`, Docker binds 127.0.0.1 and runs as user `vibe`, and the MCP HTTP transport binds 127.0.0.1 with a Host and Origin allow-list against DNS rebinding but no token. Broker keys go to the OS keyring; model keys sit in `agent/.env` in clear text. The docs carry no statement that nothing is collected (24). Live orders need a mandate that only the owner commits through the web UI or API, with hard caps and a kill switch, and an optional TAP mode waits for human approval of each Alpaca write. No order tool is exposed over MCP, and shell tools are off on the API and every MCP transport unless enabled. The local CLI runs `bash` and file writes without asking, and generated backtest code runs as a network-capable subprocess with a narrowed environment and no sandbox (13). Reader and search tools add warning-only `security_warnings` from regex rules, and external MCP tool hints are treated as untrusted in the source. The `claude-cli` provider's tool filters are described as convenience filters, not a boundary (9). A live-action ledger written append-only with a hash-chained copy, run cards with hashed execution records, tool traces and per-run token usage (13). SECURITY.md with private advisory reporting and a five-business-day acknowledgement. Three advisories were published on 2 October 2026 with CVE identifiers, five months after the 0.1.7 fix, while the email TLS and cross-site settings fixes in 0.1.16 got none. No security.txt and no bounty (11). 24+13+9+13+11 = 70.\n\n### Reliability: Vibe-Trading +5\n\n- Letta (58): Local-software lines, read for the harness. `@letta-ai/letta-code` on npm with Node.js 22.19 or newer, and PyPI wheels for glibc Linux, macOS 14 and Windows x64 with Python 3.9 or newer stated (20). ci.yml, nightly update smoke tests and Telegram live smoke tests exist, but GitHub's API answered with a rate limit, so run results were unread (15 of 25, unchecked). 332 open issues and pull requests, mostly pull requests; recent bug reports such as recall reading the wrong conversation have no reply yet (15 of 25). 398 tags at 0.34.x with release notes on GitHub, no changelog file, and breaking removals such as AgentFile announced in the README (8 of 15). Pre-1.0 (0). Total 58.\n- Vibe-Trading (63): Read with the local-software lines, as for nanobot and Agent Zero, since the owner runs it. `vibe-trading-ai` installs from PyPI for Python 3.11 or newer, with classifiers for 3.11 to 3.13, and a Docker Compose setup ships in the repository (20). A CI workflow runs the test suite on pushes and pull requests to main, with hash-locked dependency checks on Linux, macOS and Windows, and the repository holds 961 test files. Whether the latest runs on main passed couldn't be read, because GitHub's Actions pages weren't reachable (15 of 25). The repository page showed 7 open issues and 57 open pull requests on 25 October 2026, per that check (GitHub's pages answer 403 on 2 November), against 771 commits in the 30 days to 2 November, and the 0.1.18 notes list two known issues already fixed on main. Issue threads weren't read (18 of 25). CHANGELOG.md says it follows Semantic Versioning, with dated entries from 0.1.8, a Known issues section and an upgrade note for the LangChain 1.x move in 0.1.10, but on 0.x breaking changes ride in minor versions and there is no Breaking section (10 of 15). Version 0.1.18 with the classifier Development Status 4, Beta (0).\n\n## Score by category\n\n| Category | Weight | Letta | Vibe-Trading | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 58 | 63 | Vibe-Trading +5 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 70 | 72 | Vibe-Trading +2 |\n| Agent ergonomics | 13% (16.2 this run) | 67 | 67 | even |\n| Security \u0026 auth | 14% (17.5 this run) | 35 | 70 | Vibe-Trading +35 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 60 | 60 | even |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 85 | 82 | Letta +3 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 55 | 53 | Letta +2 |\n| Negative events | ≤15 | 0 | -9 | |\n| **Total** | | **59.7 · C** | **57.8 · C** | |\n\n## Facts side by side\n\n| Fact | Letta | Vibe-Trading |\n| --- | --- | --- |\n| Kind | Agent harness | Agent harness |\n| Vendor | Letta | HKUDS |\n| Hosted endpoint | no (local only) | no (local only) |\n| Transports | stdio | stdio, Streamable HTTP, SSE (legacy) |\n| Auth | OAuth or key | None |\n| Pricing | Freemium | Free |\n| x402 | no | no |\n| Licence | Apache-2.0 | MIT |\n| Tools exposed | none | 82 |\n| Read-only variant documented | no | no |\n| llms.txt | yes | no |\n| Last release | 2026-11-06 | 2026-10-21 |\n| Terms last updated | no date given | no document linked |\n| Privacy policy last updated | no date given | no document linked |\n| Customer content may train models | not found in the text | not read yet |\n| Terms restrict automated access | not found in the text | not read yet |\n| Terms restrict benchmarking | not found in the text | not read yet |\n| Terms or service can change without notice | not found in the text | not read yet |\n| Arbitration or class-action waiver | yes | not read yet |\n| Popularity | 3.8k stars, 86k npm/wk, 2.2k PyPI/wk | 37k stars |\n\n## How the scores have moved\n\n### Letta\n\nNo score change since it was listed.\n\n### Vibe-Trading\n\n- -5.0 on 2 November 2026 (B to C): correction\n- +0.4 on 28 October 2026: new evidence\n- +0.2 on 27 October 2026: new evidence\n\n## Verdicts\n\n**Letta.** Letta's open-source harness gives agents git-tracked memory blocks, skills, subagents and headless JSON runs, with a $0 plan and public per-agent API prices. It starts in the unrestricted permission mode, defaults to Letta Cloud, sends usage telemetry unless LETTA_CODE_TELEM=0 is set, and the V1 API server the comparisons describe is retired.\n\n**Vibe-Trading.** Vibe-Trading runs on the owner's machine under the MIT licence, ships near-daily fixes with a dated changelog, and keeps order tools out of its MCP server, with live orders gated by an owner-committed mandate. Three advisories, two critical, covered versions before 0.1.7, a 0.1.16 credential fix got no advisory, and the local CLI runs shell commands without asking.\n\n## Before you call either\n\n### Letta\n\n1. Start headless runs with an explicit permission mode such as `standard` or `strict`; the default auto-approves tools\n2. Pass `--backend local` for work that must stay on the machine, since Letta Cloud is the default\n3. Set LETTA_CODE_TELEM=0 in unattended runs if usage events must not be sent\n4. Use `letta -p --output-format json` for scripted runs and parse the JSON, not the terminal output\n5. Don't plan on the retired V1 REST server or `.af` AgentFile import; both are gone\n\n### Vibe-Trading\n\n1. Run 0.1.16 or later. Earlier versions carry three published advisories, including unauthenticated API access with an RCE chain, and send the email password without checking TLS certificates\n2. Set `API_AUTH_KEY` before exposing `vibe-trading serve` beyond localhost, and send it as `Authorization: Bearer \u003ckey\u003e`\n3. Set `VIBE_TRADING_ALLOWED_RUN_ROOTS` in the MCP client's `env` block; a shell `export` does not reach the spawned server\n4. Use `vibe-trading run -p \"...\" --json` for headless runs, and add `--enable-shell-tools` to `vibe-trading-mcp` only when shell access is needed\n5. Treat text from `read_url`, `web_search` and `read_document` as untrusted; `security_warnings` flags patterns but does not remove them\n\n## Questions\n\n### Which is better for AI agents, Letta or Vibe-Trading?\n\nLetta scores 59.7 (C) on agent readiness against Vibe-Trading's 57.8 (C), and leads in 2 of 7 scored categories. Vibe-Trading leads on reliability and security \u0026 auth.\n\n### Are Letta and Vibe-Trading open source?\n\nYes. Letta is open source (Apache-2.0). Vibe-Trading is open source (MIT).\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/letta-vs-vibe-trading.json, and with the fewest tokens: https://www.anchorterminal.com/compare/letta-vs-vibe-trading.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"letta\", \"b\": \"vibe-trading\"}`. From a terminal: `anchor compare letta vibe-trading`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/letta.json and https://www.anchorterminal.com/api/v1/tools/vibe-trading.json\n\n## Other comparisons with Letta or Vibe-Trading\n\n- [Agent Zero vs Letta](https://www.anchorterminal.com/compare/agent-zero-vs-letta.md)\n- [Agent Zero vs Vibe-Trading](https://www.anchorterminal.com/compare/agent-zero-vs-vibe-trading.md)\n- [Aider vs Letta](https://www.anchorterminal.com/compare/aider-vs-letta.md)\n- [Aider vs Vibe-Trading](https://www.anchorterminal.com/compare/aider-vs-vibe-trading.md)\n- [Amp vs Letta](https://www.anchorterminal.com/compare/amp-vs-letta.md)\n- [Amp vs Vibe-Trading](https://www.anchorterminal.com/compare/amp-vs-vibe-trading.md)\n- [Antigravity CLI vs Letta](https://www.anchorterminal.com/compare/antigravity-cli-vs-letta.md)\n- [Antigravity CLI vs Vibe-Trading](https://www.anchorterminal.com/compare/antigravity-cli-vs-vibe-trading.md)\n- [Auggie CLI vs Letta](https://www.anchorterminal.com/compare/auggie-vs-letta.md)\n- [Auggie CLI vs Vibe-Trading](https://www.anchorterminal.com/compare/auggie-vs-vibe-trading.md)\n- [AXLR vs Letta](https://www.anchorterminal.com/compare/axlr-vs-letta.md)\n- [AXLR vs Vibe-Trading](https://www.anchorterminal.com/compare/axlr-vs-vibe-trading.md)\n- [Claude Code vs Letta](https://www.anchorterminal.com/compare/claude-code-vs-letta.md)\n- [Claude Code vs Vibe-Trading](https://www.anchorterminal.com/compare/claude-code-vs-vibe-trading.md)\n- [Cline vs Letta](https://www.anchorterminal.com/compare/cline-vs-letta.md)\n- [Cline vs Vibe-Trading](https://www.anchorterminal.com/compare/cline-vs-vibe-trading.md)\n- [Conductor vs Letta](https://www.anchorterminal.com/compare/conductor-vs-letta.md)\n- [Conductor vs Vibe-Trading](https://www.anchorterminal.com/compare/conductor-vs-vibe-trading.md)\n- [Crush vs Letta](https://www.anchorterminal.com/compare/crush-vs-letta.md)\n- [Crush vs Vibe-Trading](https://www.anchorterminal.com/compare/crush-vs-vibe-trading.md)\n- [Cursor CLI vs Letta](https://www.anchorterminal.com/compare/cursor-cli-vs-letta.md)\n- [Cursor CLI vs Vibe-Trading](https://www.anchorterminal.com/compare/cursor-cli-vs-vibe-trading.md)\n- [DeepSeek Harness (dsh) vs Letta](https://www.anchorterminal.com/compare/deepseek-harness-vs-letta.md)\n- [DeepSeek Harness (dsh) vs Vibe-Trading](https://www.anchorterminal.com/compare/deepseek-harness-vs-vibe-trading.md)\n- [dsh-superagent (DeepSeek) vs Letta](https://www.anchorterminal.com/compare/deepseek-superagent-vs-letta.md)\n- [dsh-superagent (DeepSeek) vs Vibe-Trading](https://www.anchorterminal.com/compare/deepseek-superagent-vs-vibe-trading.md)\n- [Devin vs Letta](https://www.anchorterminal.com/compare/devin-vs-letta.md)\n- [Devin vs Vibe-Trading](https://www.anchorterminal.com/compare/devin-vs-vibe-trading.md)\n- [Droid CLI vs Letta](https://www.anchorterminal.com/compare/droid-cli-vs-letta.md)\n- [Droid CLI vs Vibe-Trading](https://www.anchorterminal.com/compare/droid-cli-vs-vibe-trading.md)\n- [Pi vs Letta](https://www.anchorterminal.com/compare/earendil-pi-vs-letta.md)\n- [Pi vs Vibe-Trading](https://www.anchorterminal.com/compare/earendil-pi-vs-vibe-trading.md)\n- [Emdash vs Letta](https://www.anchorterminal.com/compare/emdash-vs-letta.md)\n- [Emdash vs Vibe-Trading](https://www.anchorterminal.com/compare/emdash-vs-vibe-trading.md)\n- [Gemini CLI vs Letta](https://www.anchorterminal.com/compare/gemini-cli-vs-letta.md)\n- [Gemini CLI vs Vibe-Trading](https://www.anchorterminal.com/compare/gemini-cli-vs-vibe-trading.md)\n- [GitHub Copilot CLI vs Letta](https://www.anchorterminal.com/compare/github-copilot-cli-vs-letta.md)\n- [GitHub Copilot CLI vs Vibe-Trading](https://www.anchorterminal.com/compare/github-copilot-cli-vs-vibe-trading.md)\n- [goose vs Letta](https://www.anchorterminal.com/compare/goose-vs-letta.md)\n- [goose vs Vibe-Trading](https://www.anchorterminal.com/compare/goose-vs-vibe-trading.md)\n- [Harness² vs Letta](https://www.anchorterminal.com/compare/harness2-vs-letta.md)\n- [Harness² vs Vibe-Trading](https://www.anchorterminal.com/compare/harness2-vs-vibe-trading.md)\n- [HarnessRouter vs Letta](https://www.anchorterminal.com/compare/harnessrouter-vs-letta.md)\n- [HarnessRouter vs Vibe-Trading](https://www.anchorterminal.com/compare/harnessrouter-vs-vibe-trading.md)\n- [Jules vs Letta](https://www.anchorterminal.com/compare/jules-vs-letta.md)\n- [Jules vs Vibe-Trading](https://www.anchorterminal.com/compare/jules-vs-vibe-trading.md)\n- [Junie CLI vs Letta](https://www.anchorterminal.com/compare/junie-vs-letta.md)\n- [Junie CLI vs Vibe-Trading](https://www.anchorterminal.com/compare/junie-vs-vibe-trading.md)\n- [Kilo Code CLI vs Letta](https://www.anchorterminal.com/compare/kilo-code-cli-vs-letta.md)\n- [Kilo Code CLI vs 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Dev CLI vs Vibe-Trading](https://www.anchorterminal.com/compare/rovo-dev-cli-vs-vibe-trading.md)\n- [Sculptor vs Vibe-Trading](https://www.anchorterminal.com/compare/sculptor-vs-vibe-trading.md)\n- [T3 Code vs Vibe-Trading](https://www.anchorterminal.com/compare/t3-code-vs-vibe-trading.md)\n- [Traycer vs Vibe-Trading](https://www.anchorterminal.com/compare/traycer-vs-vibe-trading.md)\n- [Verdent vs Vibe-Trading](https://www.anchorterminal.com/compare/verdent-vs-vibe-trading.md)\n- [Vibe-Trading vs Warp (Warp Agent CLI and the Oz Agent API)](https://www.anchorterminal.com/compare/vibe-trading-vs-warp.md)\n- [Clawboo vs Letta](https://www.anchorterminal.com/compare/clawboo-vs-letta.md)\n- [Clawboo vs Vibe-Trading](https://www.anchorterminal.com/compare/clawboo-vs-vibe-trading.md)\n- [CLI Manager vs Letta](https://www.anchorterminal.com/compare/cli-manager-vs-letta.md)\n- [CLI Manager vs Vibe-Trading](https://www.anchorterminal.com/compare/cli-manager-vs-vibe-trading.md)\n- [Harness vs 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