feat: add dsh (DeepSeek Harness) transcript source

PARITY.md

@@ -155,6 +155,24 @@ JavaScript saver rejected Python's `msgpack` serializer type. The production
 adapter therefore delegates to the official Python saver and message reducer
 instead of decoding SQLite blobs or assuming cross-language wire compatibility.
 
+## DeepSeek Harness (dsh)
+
+The dsh adapter was checked on 2026-08-15 against three local DeepSeek Harness
+sessions without retaining or printing transcript content, paths, identifiers,
+arguments, results, or other private fields. dsh persists a zstd-compressed
+append-only JSONL event stream; the adapter intentionally accepts the
+decompressed JSONL payload and does not add a zstd dependency.
+
+Observed sessions used a top-level `session` header; `request/header` model
+configuration; `user/message` and aggregate `assistant/message` content blocks;
+direct `tool/call` and `tool/result` lifecycle events; plus turn/step,
+permission, title, request-context, and streaming chunk events. The decoder
+maps message text/reasoning and direct tool lifecycle events, ignores chunks to
+avoid duplicate assistant text, and uses source-native message/call ids for
+canonical identity. Sanitized fixtures cover the header, model and cwd metadata,
+turns, user and assistant messages, reasoning, a linked successful tool call and
+result, and ignored chunks.
+
 ## OpenCode native export
 
 The OpenCode adapter was implemented against the native-format parser in

README.md

@@ -84,6 +84,7 @@ and is empty when the transcript required no recoverable cleanup.
 | [`codex`](src/adapters/codex/) | Native Codex rollout JSONL | `codex` |
 | [`copilot-cli`](src/adapters/copilot-cli/) | Native GitHub Copilot CLI event JSONL | `copilot-cli` |
 | [`cursor`](src/adapters/cursor/) | Cursor role/message content-block JSONL capture | `cursor` |
+| [`dsh`](src/adapters/dsh/) | Decompressed DeepSeek Harness session JSONL event stream | `dsh` |
 | [`droid`](src/adapters/droid/) | Native Droid session JSONL | `droid` |
 | [`gemini-cli`](src/adapters/gemini-cli/) | Native Gemini CLI whole-session JSON | `gemini-cli` |
 | [`hermes`](src/adapters/hermes/) | Session-store message-row array or a `{ "session": {...}, "messages": [...] }` envelope | `hermes` |

fixtures/dsh/happy-path/expected.json

@@ -0,0 +1,11 @@
+{
+  "records": [
+    { "role": "meta", "source": "dsh", "cwd": "/home/user/project", "model": "deepseek-chat" },
+    { "role": "user", "content": "List the project files.", "timestamp": "2026-08-15T22:07:26.800Z" },
+    { "role": "assistant", "content": null, "tool_calls": [{ "id": "toolu-1", "name": "bash", "args": "{\"cmd\":\"ls\"}" }], "timestamp": "2026-08-15T22:07:27.000Z" },
+    { "role": "reasoning", "content": "I should inspect the directory.", "timestamp": "2026-08-15T22:07:27.100Z" },
+    { "role": "tool", "tool_call_id": "toolu-1", "content": "README.md\nsrc", "ok": true, "timestamp": "2026-08-15T22:07:27.200Z" },
+    { "role": "assistant", "content": "The project contains README.md and src.", "timestamp": "2026-08-15T22:07:27.400Z" }
+  ],
+  "diagnostics": []
+}

fixtures/dsh/happy-path/input.jsonl

@@ -0,0 +1,12 @@
+{"type":"session","version":0,"id":"session-00000000-0000-0000-0000-000000000001","createdAt":1786831646414,"cwd":"/home/user/project","delegationDepth":0,"agentPreset":"standard"}
+{"type":"permission/preset","seq":0,"time":1786831646606,"data":{"preset":"workspace-write"}}
+{"type":"request/header","seq":1,"time":1786831646610,"data":{"header":{"system":"<redacted>","tools":[{"name":"bash"}],"config":{"provider":"deepseek","model":"deepseek-chat","maxTokens":8192}},"reason":"initial"}}
+{"type":"turn/start","seq":2,"time":1786831646700,"data":{"turn":1}}
+{"type":"user/message","seq":3,"time":1786831646800,"data":{"id":"msg-user-1","role":"user","content":[{"type":"text","text":"List the project files."}],"source":{"kind":"interactive"}}}
+{"type":"assistant/chunk","seq":4,"time":1786831646900,"data":{"turn":1,"step":1,"chunk":{"type":"text","text":"I will "}}}
+{"type":"tool/call","seq":5,"time":1786831647000,"data":{"turn":1,"step":1,"callId":"toolu-1","name":"bash","arguments":"{\"cmd\":\"ls\"}"}}
+{"type":"assistant/message","seq":6,"time":1786831647100,"data":{"turn":1,"step":1,"message":{"id":"msg-assistant-call","role":"assistant","content":[{"type":"reasoning","text":"I should inspect the directory."},{"type":"tool-call","id":"toolu-1","name":"bash","arguments":"{\"cmd\":\"ls\"}"}],"source":{"kind":"model"}}}}
+{"type":"tool/result","seq":7,"time":1786831647200,"data":{"turn":1,"step":1,"message":{"id":"msg-tool-1","role":"tool","content":[{"type":"tool-result","toolCallId":"toolu-1","content":[{"type":"text","text":"README.md\nsrc"}],"isError":false}],"source":{"kind":"tool"}}}}
+{"type":"assistant/chunk","seq":8,"time":1786831647300,"data":{"turn":1,"step":2,"chunk":{"type":"text","text":"The project "}}}
+{"type":"assistant/message","seq":9,"time":1786831647400,"data":{"turn":1,"step":2,"message":{"id":"msg-assistant-final","role":"assistant","content":[{"type":"text","text":"The project contains README.md and src."}],"source":{"kind":"model"}}}}
+{"type":"turn/end","seq":10,"time":1786831647500,"data":{"turn":1,"reason":{"kind":"completed"}}}

python/src/trajectory/_types.py

@@ -3,11 +3,11 @@
 from typing import Literal, TypedDict, Union
 
 TrajectorySource = Literal[
-    "claude-code", "codex", "copilot-cli", "cursor", "droid", "gemini-cli", "hermes", "letta-code", "omp", "openclaw", "opencode", "openhands", "pi"
+    "claude-code", "codex", "copilot-cli", "cursor", "dsh", "droid", "gemini-cli", "hermes", "letta-code", "omp", "openclaw", "opencode", "openhands", "pi"
 ]
 CheckpointTrajectorySource = Literal["deepagents"]
 AnyTrajectorySource = Literal[
-    "claude-code", "codex", "copilot-cli", "cursor", "droid", "gemini-cli", "hermes", "letta-code", "omp", "openclaw", "opencode", "openhands", "pi", "deepagents"
+    "claude-code", "codex", "copilot-cli", "cursor", "dsh", "droid", "gemini-cli", "hermes", "letta-code", "omp", "openclaw", "opencode", "openhands", "pi", "deepagents"
 ]
 ToolResultTruncationStrategy = Literal["head", "head-tail"]
 ToolResultPolicy = Literal["include", "omit"]