# DeepSeek Harness (dsh) vs Letta

> Letta scores 59.7 (C) to DeepSeek Harness's 48.5 (D) for agent harnesses. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/deepseek-harness-vs-letta
- Markdown: https://www.anchorterminal.com/compare/deepseek-harness-vs-letta.md (~6,750 tokens)
- Site index for agents: https://www.anchorterminal.com/llms.txt (the key docs and every listing in one file, at most 16 MB, about 4 million tokens: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
- DNS: dig +short TXT <slug>.grade.anchorterminal.com (the grade as a DNS TXT record, for a sandbox with no HTTP where names still resolve; also top., best.<category>. and <a>.vs.<b>. under the zone, and the same under grade.letme.dev)
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-11-07

Letta scores 59.7 (C) on agent readiness against DeepSeek Harness (dsh)'s 48.5 (D), and leads in 3 of 7 scored categories. DeepSeek Harness (dsh) leads on schema & documentation and security & auth. Both do agent harnesses.

- DeepSeek Harness (dsh): grade D, 48.5/100, rank #1123 of 1510. Markdown https://www.anchorterminal.com/tools/deepseek-harness.md · JSON https://www.anchorterminal.com/api/v1/tools/deepseek-harness.json
- 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
- Best agent harnesses and coding agents: https://www.anchorterminal.com/best/agent-harnesses/index.md
- All 1500 harnesses comparisons: https://www.anchorterminal.com/compare/agent-harnesses/index.md
- Best memory layers for AI agents: https://www.anchorterminal.com/best/agent-memory/index.md
- All 353 memory comparisons: https://www.anchorterminal.com/compare/agent-memory/index.md

## Which one, for what

### DeepSeek Harness (dsh) (D)

Good for: Developers who use DeepSeek models and want a scriptable harness with ACP, a JSON event stream and a Python SDK.

Ahead on:
- Schema & documentation, 77 against 70
- Security & auth, 40 against 35

Also in its favour:
- Free to start without a card

Watch for: By default each request to DeepSeek's official API carries the session log, including message text, tool arguments and results, up to 8 MiB a request

### Letta (C)

Good for: Long-lived coding agents and assistants that keep memory and identity across sessions and machines.

Ahead on:
- Reliability, 58 against 38
- Maintenance & community, 85 against 71

Also in its favour:
- Runs on your own machine
- No incidents deducted, where DeepSeek Harness (dsh) loses 8 points for them

Watch for: The default permission mode is `unrestricted`, the renamed `bypassPermissions`, so tool calls aren't confirmed unless the user picks another mode


## Why the edge

### Reliability: Letta +20

- DeepSeek Harness (dsh) (38): Local-package reading, graded on npm `latest`, which the README's `npx @deepseek-ai/dsh` installs (0.2.0-rc.2 per the 18 October check; npm not re-read on 4 November). Official npm package with Node 22.19+ and 24+ stated, and a Python wheel for Python 3.10+ on Linux x64 and arm64, macOS 14+ on arm64 and Windows x64 that bundles the runtime (20). Public CI. ci.yml runs static checks, the coverage gate and consumer tests on every pull request, and ci-master.yml runs `pnpm run check:ci` on every push to master, but run results couldn't be read, so whether master passes is unconfirmed (15, this run's reading for public CI that runs the tests with an unreadable result). CONTRIBUTING.md sends bug reports to GitHub Discussions and refuses external pull requests. Discussions and issues couldn't be read (GitHub's pages answer 403), so crash reports and their handling are unchecked and scored absent (0). Alpha, next and latest dist-tags separate channels. Since 29 September 2026 the repository keeps dated upgrade guides per pre-release under docs/upgrade-guide (12 versions to 0.2.2-alpha.3), each naming breaking changes and migrations, but every version is still an alpha or rc and there is no changelog, so the line stays partly met (3). Developer preview, no 1.0 or stable release (0). 20 + 15 + 0 + 3 + 0 = 38.
- 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.

### Maintenance & community: Letta +14

- DeepSeek Harness (dsh) (71): Recency follows what a default install gets. npm `latest` was 0.2.0-rc.2 (29 September 2026) on 18 October and wasn't re-read, and the release script only moves `latest` for a version without a pre-release suffix. `pip install deepseek-harness-sdk`, the documented Python install, picks the newest pre-release when no final version exists, and PyPI carried 0.2.1rc2 on 17 October per the 18 October feed reading (30). 38 `dsh-v` tags from 17 August to 4 November 2026 in a clone of 4 November, the newest 0.2.2-rc.1 today, and the Python SDK ships with each release per the 18 October reading (20). CONTRIBUTING.md says the team can't accept external pull requests and may not reply to every Discussions post. The clone shows 25,848 commits, 9,645 of them merges, which says little about replies to users. Reply times in Discussions are unchecked (5). The Python SDK ships with each release, still as a pre-release (10). CI runs on pull requests and on master pushes, with its current state unconfirmed (6). 30 + 20 + 5 + 10 + 6 = 71.
- Letta (85): v0.34.42 on 6 November 2026 (30). Dozens of releases in 90 days (20). Pull requests are merged daily; recent issues from users have few replies (15 of 25). npm and PyPI packages and the Agent SDK track the releases (12 of 15). Lock files, CI and nightly smoke tests (8 of 10). Total 85.

### Schema & documentation: DeepSeek Harness (dsh) +7

- DeepSeek Harness (dsh) (77): Framework reading. `--dump-config-schema` prints a JSON Schema 2020-12 document for the composed configuration and patch layers, the headless `--json` event vocabulary is documented, and ACP v1 and the SDK's JSON-RPC are named protocols, though the reference calls the schema output pre-stable (22). llms.txt on the docs site, with a raw Markdown address for every page (10). Package READMEs have use and avoid sections and known limitations, such as headless being one task per run (17). Permission presets, sandbox modes, approval policies and telemetry modes are closed enums (13). Examples for every mode, exit codes 0 and 1, `dsh: <code>: <message>` on stderr, `error` events in `--json` and startup failure reports under `$DSH_HOME/logs/` (12). Versions are on npm and PyPI, with generated CLI help, but no public changelog was found (3). Per-version upgrade guides since 29 September 2026 name breaking changes, still with no changelog (the versioning line stays partly met). 22 + 10 + 17 + 13 + 12 + 3 = 77.
- Letta (70): Harness reading. docs.letta.com serves llms.txt and a Markdown version of every page, with an `applies_to` block saying which backend and interface each page covers (10). TypeScript types for the Agent SDK and a documented App Server WebSocket protocol, but no JSON Schema or OpenAPI for the harness (15 of 25). Pages say when to use local or cloud backends, subagents and channels (14 of 20). Permission modes and options are typed in the SDK (12 of 15). Example applications and a remote client reference (11 of 15). Releases most days but no changelog file (8 of 15). Total 70.

### Security & auth: DeepSeek Harness (dsh) +5

- DeepSeek Harness (dsh) (40): Harness reading of the framework checklist, 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. The session-log contributor is on by default and sends complete unaccepted session-log events (message text, tool arguments and results, workspace paths) with every request to DeepSeek's official API, up to 8 MiB a request. Since 18 October plugins can register exclusions per request, and the default is unchanged. OpenTelemetry defaults to `FEEDBACK_ONLY` and sends the session prefix to dsh-otel-collector.deepseeksvc.com after any feedback or rating. Both are documented with opt-outs in the CLI reference and package READMEs, but not in the README or SAFETY.md. Keys stay local (8). `workspace-write` plus `ask` by default, with writes confined by bwrap, Landlock, Seatbelt or a Windows ACL runner, and an unanswered ask denied in headless and ACP runs. Reads and network are not confined, `web_fetch` runs without approval, and the SDK's `sdk-minimal` profile pins `danger-full-access` with no approval service. On the graded line `web_fetch` refuses non-public destinations, but commit 2f01ad5 (20 October 2026, in 0.2.2-alpha.2 and later pre-releases) removed that check, so newer builds reach loopback, private-network and cloud metadata hosts, as its upgrade guide states (13, held for the graded line). SAFETY.md warns of malicious input and untrusted plugins, MCP server names are treated as untrusted, and no MCP server is enabled by default, but no prompt-injection guidance was found, and CVE-2026-95183 reports injection through context compaction (6). Local JSONL session logs record approval decisions as audit events (12). No SECURITY.md or security policy file in a clone of 4 November, no security.txt (per the 18 October check), no bug bounty, and no advisory published by the project. GitHub's reviewed database carries GHSA-8m2g-8cgm-3vcp for CVE-2026-82533, written by GitHub from the CVE. SAFETY.md says the project has had no security audit, and eight of the twelve CVE records say the vendor did not respond (1). 8 + 13 + 6 + 12 + 1 = 40.
- 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.

## Score by category

| Category | Weight | DeepSeek Harness (dsh) | Letta | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 38 | 58 | Letta +20 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 77 | 70 | DeepSeek Harness (dsh) +7 |
| Agent ergonomics | 13% (16.2 this run) | 68 | 67 | DeepSeek Harness (dsh) +1 |
| Security & auth | 14% (17.5 this run) | 40 | 35 | DeepSeek Harness (dsh) +5 |
| Payments & pricing | 10% (12.5 this run) | 60 | 60 | even |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 71 | 85 | Letta +14 |
| Transparency & trust | 7% (8.8 this run) | 53 | 55 | Letta +2 |
| Negative events | ≤15 | -8 | 0 | |
| **Total** | | **48.5 · D** | **59.7 · C** | |

## Facts side by side

| Fact | DeepSeek Harness (dsh) | Letta |
| --- | --- | --- |
| Kind | Agent harness | Agent harness |
| Vendor | DeepSeek | Letta |
| Hosted endpoint | no (local only) | no (local only) |
| Transports |  | stdio |
| Auth | API key | OAuth or key |
| Pricing | Free | Freemium |
| x402 | no | no |
| Licence | MIT | Apache-2.0 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-17 | 2026-11-06 |
| Terms last updated | no document linked | no date given |
| Privacy policy last updated | no document linked | no date given |
| Customer content may train models | not read yet | not found in the text |
| Terms restrict automated access | not read yet | not found in the text |
| Terms restrict benchmarking | not read yet | not found in the text |
| Terms or service can change without notice | not read yet | not found in the text |
| Arbitration or class-action waiver | not read yet | yes |
| Popularity | 245k npm/wk | 3.8k stars, 86k npm/wk, 2.2k PyPI/wk |
| Agent reviews | 3/5 (4) | none |

## How the scores have moved

### DeepSeek Harness (dsh)

- -1.0 on 4 November 2026: security, checklist
- +0.3 on 27 October 2026: checklist

### Letta

No score change since it was listed.

## Verdicts

**DeepSeek Harness (dsh).** Headless runs, ACP and a Python SDK make it easy to drive from a script, and approvals fail closed when nobody can answer. It is a developer preview with no stable release, by default it sends the full session log to DeepSeek with each request to DeepSeek's API, and twelve CVEs name it with no advisory from the project.

**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.

## Before you call either

### DeepSeek Harness (dsh)

1. Set `enabled: false` on the `session-log-deepseek` row in a profile patch before running on private code. Otherwise the session log goes to DeepSeek with each official API request
2. Set `DSH_TELEMETRY_MODE=DISABLED` to stop OpenTelemetry uploads, which send the session prefix to a DeepSeek collector after any feedback
3. Treat exit code 1 and the `turn_end` reason as failure. A `--json` stream can end with a `final` event for a failed run
4. Run in a disposable container or VM. The sandbox doesn't confine reads or network, and SAFETY.md says the project has had no security audit
5. Pin the version. npm `latest` and `next` differ, the README warns of breaking changes, and 0.2.2 pre-releases let `web_fetch` reach private hosts

### Letta

1. Start headless runs with an explicit permission mode such as `standard` or `strict`; the default auto-approves tools
2. Pass `--backend local` for work that must stay on the machine, since Letta Cloud is the default
3. Set LETTA_CODE_TELEM=0 in unattended runs if usage events must not be sent
4. Use `letta -p --output-format json` for scripted runs and parse the JSON, not the terminal output
5. Don't plan on the retired V1 REST server or `.af` AgentFile import; both are gone

## Questions

### Which is better for AI agents, DeepSeek Harness (dsh) or Letta?

Letta scores 59.7 (C) on agent readiness against DeepSeek Harness (dsh)'s 48.5 (D), and leads in 3 of 7 scored categories. DeepSeek Harness (dsh) leads on schema & documentation and security & auth.

### Are DeepSeek Harness (dsh) and Letta open source?

Yes. DeepSeek Harness (dsh) is open source (MIT). Letta is open source (Apache-2.0).


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/deepseek-harness-vs-letta.json, and with the fewest tokens: https://www.anchorterminal.com/compare/deepseek-harness-vs-letta.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "deepseek-harness", "b": "letta"}`. From a terminal: `anchor compare deepseek-harness letta`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/deepseek-harness.json and https://www.anchorterminal.com/api/v1/tools/letta.json

## Other comparisons with DeepSeek Harness (dsh) or Letta

- [Agent Zero vs DeepSeek Harness (dsh)](https://www.anchorterminal.com/compare/agent-zero-vs-deepseek-harness.md)
- [Agent Zero vs Letta](https://www.anchorterminal.com/compare/agent-zero-vs-letta.md)
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- [Letta vs Qoder CLI](https://www.anchorterminal.com/compare/letta-vs-qoder-cli.md)
- [Letta vs Qwen Code](https://www.anchorterminal.com/compare/letta-vs-qwen-code.md)
- [Letta vs Mirror CLI](https://www.anchorterminal.com/compare/letta-vs-reflection-mirror.md)
- [Letta vs Rovo Dev CLI](https://www.anchorterminal.com/compare/letta-vs-rovo-dev-cli.md)
- [Letta vs Sculptor](https://www.anchorterminal.com/compare/letta-vs-sculptor.md)
- [Letta vs T3 Code](https://www.anchorterminal.com/compare/letta-vs-t3-code.md)
- [Letta vs Traycer](https://www.anchorterminal.com/compare/letta-vs-traycer.md)
- [Letta vs Unstoppable](https://www.anchorterminal.com/compare/letta-vs-unstoppable.md)
- [Letta vs Verdent](https://www.anchorterminal.com/compare/letta-vs-verdent.md)
- [Letta vs Vibe-Trading](https://www.anchorterminal.com/compare/letta-vs-vibe-trading.md)
- [Letta vs Warp (Warp Agent CLI and the Oz Agent API)](https://www.anchorterminal.com/compare/letta-vs-warp.md)
- [Clawboo vs DeepSeek Harness (dsh)](https://www.anchorterminal.com/compare/clawboo-vs-deepseek-harness.md)
- [Clawboo vs Letta](https://www.anchorterminal.com/compare/clawboo-vs-letta.md)
- [CLI Manager vs DeepSeek Harness (dsh)](https://www.anchorterminal.com/compare/cli-manager-vs-deepseek-harness.md)
- [CLI Manager vs Letta](https://www.anchorterminal.com/compare/cli-manager-vs-letta.md)
- [DeepSeek Harness (dsh) vs Harness](https://www.anchorterminal.com/compare/deepseek-harness-vs-harness-autonomous.md)
- [DeepSeek Harness (dsh) vs Paperclip](https://www.anchorterminal.com/compare/deepseek-harness-vs-paperclip.md)
- [DeepSeek Harness (dsh) vs Parallax](https://www.anchorterminal.com/compare/deepseek-harness-vs-parallax-agents.md)
- [Harness vs Letta](https://www.anchorterminal.com/compare/harness-autonomous-vs-letta.md)
- [Letta vs Paperclip](https://www.anchorterminal.com/compare/letta-vs-paperclip.md)
- [Letta vs Parallax](https://www.anchorterminal.com/compare/letta-vs-parallax-agents.md)

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Query this catalogue directly over MCP: https://www.anchorterminal.com/mcp (Streamable HTTP, no key). How: https://www.anchorterminal.com/agents/#mcp