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@kontourai/ferry

Migrate AI conversations between tools. Importers and exporters for @kontourai/thread, plus the ferry CLI.

ferry inspect ~/.claude/projects/<project>/<session>.jsonl
ferry convert rollout.jsonl -o session.thread.json
ferry convert session.thread.json --to anthropic-messages
ferry formats

Input formats: claude-code, codex, opencode (opencode export JSON), kiro, pi, muse (Muse Code muse export JSON), chatgpt-export, thread. Output formats: thread, openai-chat, anthropic-messages, gemini, markdown.

Importers are grounded in real transcript shapes (including multi-hundred-MB JSONL files, which stream); each adapter documents what its target format cannot represent.

ferry rows emits one JSON object per tool call (or --csv for a narrower projection), streamed per file so it can be pointed at a whole sessions directory. Each row carries the dimensions the schema keeps in different places — source/sourceVersion/cwd/gitBranch from the thread, model/provider from the owning assistant message, the tool's name and raw arguments, parsedArguments when the source supplied structure, derived for importer heuristics, and isError/toolResultId/resultStatus/resultChars joined from the matching ToolResult by toolCallId. Result columns are ABSENT for an unpaired call: a missing result is not a successful one, and resultChars counts result TEXT only, so a result carrying just an image reads as 0. An observed result with unknown standing leaves isError absent rather than being fabricated as false; its resultStatus remains unknown.

Unlike convert/usage, a bad input is warned about and skipped rather than aborting the run: exit 0 means every input was read, 2 means the run completed with inputs skipped, and 1 stays reserved for a fatal error. A file that simply contains no conversation (a sessions directory holds non-transcript sidecars) is reported but is not a skip — it is a normal outcome, not a failure.

There is no sidechain column: in current Claude Code versions subagent traffic lives in separate transcript files rather than inline sidechain lines, so such a column would be permanently false. It returns when an importer reads those files.

--csv cells are emitted verbatim, including a leading =, +, - or @, which a spreadsheet may interpret as a formula. That is deliberate — escaping would corrupt every legitimate -1 and every command starting with a flag — so prefer --jsonl into a query engine for untrusted data.

claude-code-duplicate-toolcall.jsonl is composed: it reproduces the real writer behaviour of emitting one assistant line twice (same uuid, same message.id), which the importer merges by message.id — observed once across 72,735 rows of a local corpus.

Codex fixture provenance: codex-forked-rollout.jsonl (lines 1-4 = rollout 2026-06-25T23-06-53-019f0252 lines 19-22) and codex-rollout-variants.jsonl (lines 1-4 = rollout 2026-03-27T22-21-41-019d32ad lines 8, 10, 11, 15) are byte-copied from real local rollouts — only free-text values are replaced with [redacted]; keys, nesting, and every non-text value remain as written by Codex. codex-rollout.jsonl is a composed fixture whose individual usage records mirror observed shapes. codex-exec-program.jsonl is composed, with each exec payload shaped after the dominant real form measured across a 12.2 GB local corpus: a single double-quoted cmd string (255,070 occurrences) rather than an array (6 occurrences, none of them JSON-parseable — which is why array literals are deliberately not recovered), plus the single-quoted and backtick variants (1,009 / 3,472) and two apply_patch payloads, one of which contains tools.map( in its diffed source because that shape defeated an earlier gate.

Tool-result identity is deterministic and namespaced (ferry:<adapter>:sha256:…), computed only from source record anchors and a source result index. It never uses a call id, output text, timestamp, or prose-derived result status. Claude Code, Codex, OpenCode, Kiro, Pi, and Muse imports capture the observed identity/status surface documented in their adapter headers; ChatGPT exports contain no byte-real tool-result mapping in the retained fixture and remain intentionally unmapped.

The retained Claude Code, OpenCode, Kiro, and Pi fixtures prove their listed success forms but do not contain a byte-real failed tool result. Their error markers therefore remain unknown rather than being promoted from composed examples; adding an error mapping requires an observed writer record and its fixture provenance.

License: Apache-2.0