claude-obsidian: Claude conversations -> Obsidian notes (+ MCP) (#1)

claude-obsidian/README.md

@@ -0,0 +1,113 @@
+# claude-obsidian — Claude conversations → Obsidian notes
+
+Summarizes every Claude conversation into one searchable Obsidian note: what happened, what
+was decided and why, the facts and gotchas worth remembering, and what was left open.
+
+- **Claude Code** sessions sync automatically and incrementally (hourly timer).
+- **claude.ai** chats import from a data export (claude.ai has no API, so each export is manual).
+
+Notes are written through the [Obsidian Local REST API](https://github.com/coddingtonbear/obsidian-local-rest-api)
+plugin, so the vault can live anywhere the plugin is reachable. The same plugin exposes a
+**built-in MCP server** (`/mcp/`), which is how Claude reads the notes back — no separate MCP
+process.
+
+```
+~/.claude/projects/*/*.jsonl ─┐                                          ┌─ Claude/Code/2026/…md
+claude.ai export .zip ────────┼─ condense → redact → summarize → PUT ────┼─ Claude/Web/2026/…md
+                              └─ (headless claude -p, no transcript)     └─ Claude/Index.md
+```
+
+## Install
+
+1. In Obsidian, install **Local REST API**, enable its **HTTP server**, and make it reachable
+   from this machine. Put the API key in `~/.config/claude-obsidian/api-key` (`chmod 600`).
+2. `./install.sh` — links the binary into `~/.local/bin`, enables the hourly user timer, and
+   creates `~/.config/claude-obsidian/config.env` from `config.env.example` if absent.
+3. Edit `config.env` (at minimum `OBSIDIAN_API_URL`), then preview one note:
+
+   ```bash
+   claude-obsidian-sync stats                       # sizes, no network
+   claude-obsidian-sync sync --dry-run --limit 1    # prints the note, writes nothing
+   ```
+
+## Use
+
+```bash
+claude-obsidian-sync sync                          # what the timer runs
+claude-obsidian-sync sync --session <session-id>   # one session, now, ignoring the settle window
+claude-obsidian-sync import-claude-ai ~/Downloads/data-2026-09-13.zip
+claude-obsidian-sync sync --prefetch --limit 3     # summarize into the local cache, vault untouched
+claude-obsidian-sync usage                         # calls, billed tokens, spend: last 5h / 24h / 7d
+```
+
+Claude reads the vault through the plugin's MCP server:
+
+```bash
+claude mcp add --scope user --transport http obsidian http://<host>:27123/mcp/ \
+  --header "Authorization: Bearer $(cat ~/.config/claude-obsidian/api-key)"
+```
+
+## How it behaves — and why
+
+- **Summaries run on your own Claude plan** via headless `claude -p` (`LLM_BACKEND=claude-cli`).
+  No API key to manage. An OpenAI-compatible backend (`LLM_BACKEND=openai`) exists for local
+  models. Note a LiteLLM gateway that fronts Claude by *passing through the caller's*
+  subscription has no key of its own, so a background job cannot use its `claude-*` models.
+- **`--no-session-persistence` is load-bearing.** Without it every summary writes a new
+  transcript into `~/.claude/projects`, and the next run summarizes its own summarizing.
+- **Usage is metered and capped.** Every model call is appended to
+  `~/.local/state/claude-obsidian/usage.jsonl` with *billed* tokens (the CLI's `modelUsage`, not
+  the visible turn) and `total_cost_usd` — API list-price equivalent, a faithful proxy for how much
+  was consumed; the plan's own meter is only visible in Claude Code's `/usage`. Before each call
+  its cost is **estimated** (+20% margin) and the call is refused if it would cross
+  `BUDGET_USD_PER_RUN` or the rolling `BUDGET_USD_PER_DAY` — so budgets are never overshot. Not
+  `claude -p --max-budget-usd`: that aborts *after* the tokens are spent and discards the result
+  (measured: $0.26 for nothing). Every run ends with a one-line usage report.
+- **Three cost levers, measured on one session — $0.057 → $0.010, same summary content:**
+  `alwaysThinkingEnabled=false` (extended thinking was ~85% of output tokens),
+  `DISABLE_PROMPT_CACHING=1` (the CLI writes each prompt to the 1-hour cache at 2× input price, and
+  a one-shot call never reads it back), and `CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC=1` (otherwise a
+  hidden side request re-reads the entire prompt, doubling billed input). A whole ~110-session
+  backlog is about $2 at list price with all three.
+- **Summaries are cached until their note is written**, so a vault outage never pays for the same
+  summary twice, and `--prefetch` can do the summarizing while the vault is unreachable.
+- **It shares your plan's usage limits.** A first backfill of ~100 sessions in parallel hit a
+  session limit within minutes — which also limits *interactive* use. So: one job at a time,
+  `MAX_PER_RUN` sessions per run (newest first), and the run **stops at the first usage-limit
+  error** (exit 75, which the systemd unit treats as success) instead of failing the rest of
+  the queue. The next hourly run resumes. A 100-session backlog drains in about ten hours.
+- **Secrets are redacted before anything leaves the machine**, and again in the note: private
+  keys, bearer tokens, `password=`-style assignments, JWTs, provider tokens, ≥48-char hex, and
+  random mixed-case strings. It over-redacts on purpose; git SHAs, md5s and paths survive.
+  The summarizer is also told never to reproduce secrets.
+- **One run at a time** (a `flock` on `run.lock`): an hourly timer firing during a long manual run
+  exits immediately instead of racing it on the state and ledger files.
+- **Several vault URLs** can be listed; the first that answers wins, so one config covers both a
+  permanent address and a temporary `kubectl port-forward`.
+- **Incremental and idempotent.** State (`~/.local/state/claude-obsidian/state.json`) records
+  each session's size+mtime. A resumed session is re-summarized into the *same* note path. A
+  session is left alone until idle for `SETTLE_MINUTES`, so a live conversation isn't
+  summarized mid-flight. Empty sessions are recorded and skipped.
+- **Condensed, not truncated.** Tool output is dropped and each tool call becomes one line;
+  prose is kept. Typical compression is ~60× (271 MB of transcripts → 4.4 MB). Sessions over
+  300 KB condensed are summarized in parts, then combined.
+- **Subagent transcripts** (`<session>/subagents/**`) are part of their parent session and are
+  not synced separately.
+
+## Note format
+
+```yaml
+type: claude-conversation
+source: claude-code            # or claude-ai
+session_id: 3f9c2a1e-…
+title: Fix flaky CI cache after runner upgrade
+project: my-service            # basename of the working directory
+branch: …
+started / ended: …
+prompts: 1                     # user prompts, not tool-loop records
+summarized_by: claude-haiku-4-5-20251001
+tags: [claude, claude-code, ci, caching, …]
+```
+
+followed by a summary callout and **Outcomes / Decisions / Facts & gotchas / Open threads**,
+and a `claude --resume <id>` line. `Claude/Index.md` lists every note, newest first.

claude-obsidian/claude-obsidian-sync

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+#!/usr/bin/env python3
+"""claude-obsidian-sync -- summarize Claude conversations into an Obsidian vault.
+
+Reads Claude Code transcripts (~/.claude/projects/<project>/<session>.jsonl) and claude.ai
+data exports, condenses each conversation, redacts secrets, summarizes it with an
+OpenAI-compatible LLM endpoint (e.g. LiteLLM), and writes one note per conversation into
+Obsidian through the Local REST API plugin. Standard library only.
+
+  claude-obsidian-sync stats                 # sizes and counts, no network
+  claude-obsidian-sync sync [--dry-run]      # Claude Code sessions (incremental)
+  claude-obsidian-sync import-claude-ai EXPORT.zip|conversations.json
+
+Configuration comes from the environment, falling back to ~/.config/claude-obsidian/config.env
+(KEY=VALUE lines). Nothing environment-specific lives in this file. See README.md.
+"""
+from __future__ import annotations
+
+import argparse
+import concurrent.futures as cf
+import datetime as dt
+import fcntl
+import hashlib
+import json
+import os
+import pathlib
+import re
+import shutil
+import subprocess
+import sys
+import threading
+import time
+import urllib.error
+import urllib.parse
+import urllib.request
+import zipfile
+
+HOME = pathlib.Path.home()
+CONFIG_DIR = HOME / ".config" / "claude-obsidian"
+
+
+# --------------------------------------------------------------------------- config
+def load_config() -> dict:
+    cfg: dict[str, str] = {}
+    f = CONFIG_DIR / "config.env"
+    if f.exists():
+        for line in f.read_text().splitlines():
+            line = line.strip()
+            if line and not line.startswith("#") and "=" in line:
+                k, v = line.split("=", 1)
+                v = re.split(r"\s+#", v, maxsplit=1)[0]            # inline comment; a '#' inside a value survives
+                cfg[k.strip()] = v.strip().strip('"').strip("'")
+    cfg.update({k: v for k, v in os.environ.items() if k in DEFAULTS or k.startswith("LLM_") or k.startswith("OBSIDIAN_")})
+    for k, v in DEFAULTS.items():
+        cfg.setdefault(k, v)
+    return cfg
+
+
+DEFAULTS = {
+    "OBSIDIAN_API_URL": "http://127.0.0.1:27123",
+    "OBSIDIAN_API_KEY_FILE": str(CONFIG_DIR / "api-key"),
+    "LLM_BACKEND": "claude-cli",           # claude-cli | openai
+    "CLAUDE_BIN": "claude",
+    "LLM_BASE_URL": "",
+    "LLM_API_KEY_FILE": "",
+    "LLM_API_KEY_ENV": "LITELLM_KEY",
+    "LLM_MODEL": "haiku",
+    "VAULT_FOLDER": "Claude",
+    "SETTLE_MINUTES": "30",
+    "CLAUDE_PROJECTS_DIR": str(HOME / ".claude" / "projects"),
+    "STATE_FILE": str(HOME / ".local" / "state" / "claude-obsidian" / "state.json"),
+    "JOBS": "1",
+    # Cap per run. Summaries draw on the same plan limits as interactive Claude use, so the
+    # timer drips a backlog instead of bursting it (a 107-session burst exhausted a session limit).
+    "MAX_PER_RUN": "10",
+    # Spend guards, in API list-price USD as reported by `claude -p` (total_cost_usd). Not the
+    # plan's own meter -- that is only visible in Claude Code's /usage -- but a faithful proxy
+    # for how much was consumed. Hitting one stops the run like a usage limit (exit 75).
+    "BUDGET_USD_PER_RUN": "0.50",
+    "BUDGET_USD_PER_DAY": "2.00",
+    # Pre-call estimate prices (USD per million tokens, list). A call is refused BEFORE it runs
+    # if the estimate would cross a budget. Deliberately NOT `claude -p --max-budget-usd`: that
+    # aborts after the tokens are spent and throws the result away (measured: $0.26 for nothing).
+    "LLM_PRICE_IN_PER_M": "1.0",
+    "LLM_PRICE_OUT_PER_M": "5.0",
+}
+
+
+def secret(cfg: dict, file_key: str, env_key: str | None = None) -> str:
+    path = cfg.get(file_key)
+    if path:
+        p = pathlib.Path(os.path.expanduser(path))
+        if p.exists():
+            return p.read_text().strip()
+    if env_key and os.environ.get(cfg.get(env_key, "") or ""):
+        return os.environ[cfg[env_key]].strip()
+    raise SystemExit(f"missing secret: set {file_key} (or {env_key})")
+
+
+# --------------------------------------------------------------------------- redaction
+# Applied to everything sent to the LLM AND to the note written. Over-redaction is the
+# accepted failure mode: a summary missing a token is fine, a vault holding one is not.
+_REDACTIONS = [
+    (re.compile(r"-----BEGIN [A-Z ]*PRIVATE KEY-----.*?-----END [A-Z ]*PRIVATE KEY-----", re.S), "[REDACTED PRIVATE KEY]"),
+    (re.compile(r"(?i)\b(bearer|token)\s+[A-Za-z0-9._~+/=-]{16,}"), r"\1 [REDACTED]"),
+    (re.compile(r"(?i)((?:password|passwd|pwd|secret|token|api[_-]?key|access[_-]?key|private[_-]?key|client[_-]?secret|NB_API_KEY|PAT)[\"']?\s*[:=]\s*[\"']?)([^\s\"'`,;]{6,})"), r"\1[REDACTED]"),
+    (re.compile(r"\beyJ[A-Za-z0-9_-]{10,}\.[A-Za-z0-9_-]{10,}\.[A-Za-z0-9_-]{10,}"), "[REDACTED JWT]"),
+    (re.compile(r"\b(?:sk|pk|rk)-[A-Za-z0-9_-]{20,}|\bgh[pousr]_[A-Za-z0-9]{30,}|\bglpat-[A-Za-z0-9_-]{20,}|\bxox[abpr]-[A-Za-z0-9-]{10,}"), "[REDACTED TOKEN]"),
+    # >=48 hex: API keys / sha256 tokens. Deliberately leaves 40-hex git SHAs and 32-hex md5s.
+    (re.compile(r"\b[a-fA-F0-9]{48,}\b"), "[REDACTED HEX]"),
+    # Random mixed-case+digit strings (generated passwords). No '/' so paths survive.
+    (re.compile(r"(?<![A-Za-z0-9_./-])(?=[A-Za-z0-9+]*[0-9])(?=[A-Za-z0-9+]*[a-z])(?=[A-Za-z0-9+]*[A-Z])[A-Za-z0-9+]{20,}={0,2}(?![A-Za-z0-9_./-])"), "[REDACTED]"),
+]
+
+
+def redact(text: str) -> str:
+    for pat, repl in _REDACTIONS:
+        text = pat.sub(repl, text)
+    return text
+
+
+# --------------------------------------------------------------------------- parsing
+_NOISE_BLOCKS = re.compile(
+    r"<(system-reminder|local-command-stdout|local-command-stderr|local-command-caveat|task-notification)>.*?</\1>",
+    re.S,
+)
+_CMD = re.compile(r"<command-name>(.*?)</command-name>.*?(?:<command-args>(.*?)</command-args>)?", re.S)
+MAX_MSG = 6000
+
+
+def _clip(text: str) -> str:
+    return text if len(text) <= MAX_MSG else text[:4000] + "\n[...clipped...]\n" + text[-1500:]
+
+
+def _clean_user(text: str) -> str:
+    text = _NOISE_BLOCKS.sub("", text)
+    m = _CMD.search(text)
+    if m:
+        args = (m.group(2) or "").strip()
+        text = f"{m.group(1).strip()} {args}".strip()
+    text = re.sub(r"</?command-(message|args|name)>", "", text)
+    return text.strip()
+
+
+def _tool_line(block: dict) -> str:
+    name = block.get("name", "tool")
+    inp = block.get("input") or {}
+    desc = inp.get("description") or inp.get("command") or inp.get("file_path") or inp.get("query") \
+        or inp.get("url") or inp.get("prompt") or inp.get("pattern") or ""
+    desc = " ".join(str(desc).split())[:160]
+    return f"[{name}: {desc}]" if desc else f"[{name}]"
+
+
+def parse_claude_code(path: pathlib.Path) -> dict:
+    meta = {"session_id": path.stem, "cwd": None, "branch": None, "first": None, "last": None,
+            "title": None, "version": None, "prompts": 0}
+    turns: list[list[str]] = []
+    for line in path.open(encoding="utf-8", errors="replace"):
+        try:
+            r = json.loads(line)
+        except json.JSONDecodeError:
+            continue
+        t = r.get("type")
+        if t == "ai-title" and r.get("aiTitle"):
+            meta["title"] = r["aiTitle"]
+        if t == "custom-title" and r.get("customTitle"):
+            meta["title"] = r["customTitle"]
+        if t not in ("user", "assistant") or r.get("isSidechain") or r.get("isMeta"):
+            continue
+        ts = r.get("timestamp")
+        if ts:
+            meta["first"] = meta["first"] or ts
+            meta["last"] = ts
+        meta["cwd"] = meta["cwd"] or r.get("cwd")
+        meta["branch"] = r.get("gitBranch") or meta["branch"]
+        meta["version"] = r.get("version") or meta["version"]
+        content = (r.get("message") or {}).get("content")
+        if t == "user":
+            if isinstance(content, str):
+                text = content
+            elif isinstance(content, list):
+                text = "\n".join(b.get("text", "") for b in content if b.get("type") == "text")
+            else:
+                continue
+            text = _clean_user(text)
+            if text:
+                role = "SUMMARY-OF-EARLIER-CONTEXT" if r.get("isCompactSummary") else "USER"
+                turns.append([role, _clip(text)])
+                meta["prompts"] += role == "USER"
+        else:
+            parts = []
+            for b in content if isinstance(content, list) else []:
+                if b.get("type") == "text" and b.get("text", "").strip():
+                    parts.append(_clip(b["text"].strip()))
+                elif b.get("type") == "tool_use":
+                    parts.append(_tool_line(b))
+            if not parts:
+                continue
+            if turns and turns[-1][0] == "ASSISTANT":       # a tool loop is many records
+                turns[-1][1] += "\n" + "\n".join(parts)
+            else:
+                turns.append(["ASSISTANT", "\n".join(parts)])
+    meta["transcript"] = "\n\n".join(f"{role}: {text}" for role, text in turns)
+    return meta
+
+
+def parse_claude_ai_export(src: pathlib.Path) -> list[dict]:
+    """claude.ai 'Export data' -> conversations.json. Tolerant of field-name drift."""
+    if src.suffix == ".zip":
+        with zipfile.ZipFile(src) as z:
+            name = next((n for n in z.namelist() if n.endswith("conversations.json")), None)
+            if not name:
+                raise SystemExit(f"no conversations.json inside {src}")
+            data = json.loads(z.read(name))
+    else:
+        data = json.loads(src.read_text())
+    out = []
+    for c in data if isinstance(data, list) else data.get("conversations", []):
+        turns, count = [], 0
+        for m in c.get("chat_messages") or c.get("messages") or []:
+            text = m.get("text") or ""
+            if not text and isinstance(m.get("content"), list):
+                text = "\n".join(b.get("text", "") for b in m["content"] if b.get("type") == "text")
+            for a in m.get("attachments") or []:
+                if a.get("extracted_content"):
+                    text += f"\n[attachment {a.get('file_name', '')}]: {a['extracted_content'][:1500]}"
+            if not text.strip():
+                continue
+            role = "USER" if (m.get("sender") or m.get("role")) in ("human", "user") else "ASSISTANT"
+            turns.append(f"{role}: {_clip(text.strip())}")
+            count += role == "USER"
+        if not turns:
+            continue
+        out.append({
+            "session_id": c.get("uuid") or hashlib.sha1(json.dumps(c, sort_keys=True).encode()).hexdigest(),
+            "title": c.get("name") or None, "first": c.get("created_at"), "last": c.get("updated_at"),
+            "cwd": None, "branch": None, "version": None, "prompts": count,
+            "transcript": "\n\n".join(turns),
+        })
+    return out
+
+
+# --------------------------------------------------------------------------- LLM
+SYSTEM = """You write concise knowledge-base notes summarizing a conversation between a user and Claude.
+The reader is the same user, months later, searching their notes. Capture what happened and
+what was learned, not a play-by-play. Be specific: name the systems, files, commands, errors
+and decisions. Never include passwords, API keys, tokens or other secrets, even if present;
+refer to them generically ("the API key"). Text marked [REDACTED] must stay redacted.
+
+Reply with ONLY a JSON object, no prose, with these keys:
+  "title": short specific title (<= 70 chars)
+  "summary": 3-6 sentences
+  "outcomes": list of what was actually built, fixed or answered
+  "decisions": list of choices made and why
+  "facts": list of reusable facts, gotchas, root causes worth remembering
+  "open_threads": list of unfinished work or follow-ups
+  "tags": 3-8 lowercase kebab-case topic tags
+Use empty lists where nothing applies."""
+
+CHUNK_SYSTEM = """You are condensing one part of a long conversation between a user and Claude so that a
+later step can summarize the whole. Output dense bullet notes: goals, actions taken, results,
+errors and their causes, decisions, open questions. Be specific. Never reproduce secrets."""
+
+CHUNK_CHARS = 300_000
+
+
+class Ledger:
+    """Append-only record of every model call: tokens and list-price cost. Also enforces budgets."""
+
+    def __init__(self, cfg: dict):
+        self.path = pathlib.Path(os.path.expanduser(cfg["STATE_FILE"])).parent / "usage.jsonl"
+        self.run_budget = float(cfg["BUDGET_USD_PER_RUN"])
+        self.day_budget = float(cfg["BUDGET_USD_PER_DAY"])
+        self.lock = threading.Lock()
+        self.run_cost = 0.0
+        self.run_calls = 0
+        self.run_in = self.run_out = 0
+
+    def entries(self, since: dt.datetime | None = None) -> list[dict]:
+        if not self.path.exists():
+            return []
+        out = []
+        for line in self.path.read_text().splitlines():
+            try:
+                e = json.loads(line)
+            except json.JSONDecodeError:
+                continue
+            if since is None or dt.datetime.fromisoformat(e["ts"]) >= since:
+                out.append(e)
+        return out
+
+    def spent_since(self, hours: float) -> float:
+        since = dt.datetime.now(dt.timezone.utc) - dt.timedelta(hours=hours)
+        return sum(e.get("cost_usd") or 0 for e in self.entries(since))
+
+    def check(self, estimate: float = 0.0) -> None:
+        """Called BEFORE each model call with that call's estimated cost -- so a budget is never overshot."""
+        with self.lock:
+            if self.run_cost + estimate > self.run_budget:
+                raise BudgetExhausted(f"run budget ${self.run_budget:.2f}: ${self.run_cost:.3f} spent, "
+                                      f"next call est. ${estimate:.3f}")
+        day = self.spent_since(24)
+        if day + estimate > self.day_budget:
+            raise BudgetExhausted(f"24h budget ${self.day_budget:.2f}: ${day:.3f} spent, next call est. ${estimate:.3f}")
+
+    def record(self, label: str, model: str, usage: dict, cost: float | None) -> None:
+        e = {"ts": dt.datetime.now(dt.timezone.utc).isoformat(timespec="seconds"), "item": label, "model": model,
+             "input": (usage.get("input_tokens") or 0) + (usage.get("cache_creation_input_tokens") or 0)
+                      + (usage.get("cache_read_input_tokens") or 0),
+             "output": usage.get("output_tokens") or 0, "cost_usd": cost}
+        with self.lock:
+            self.path.parent.mkdir(parents=True, exist_ok=True)
+            with self.path.open("a") as f:
+                f.write(json.dumps(e) + "\n")
+            self.run_calls += 1
+            self.run_cost += cost or 0
+            self.run_in += e["input"]
+            self.run_out += e["output"]
+
+    def report(self) -> str:
+        return (f"usage this run: {self.run_calls} model calls, {self.run_in:,} in / {self.run_out:,} out tokens, "
+                f"${self.run_cost:.3f} list-price equiv | last 24h ${self.spent_since(24):.3f} of ${self.day_budget:.2f}")
+
+
+class BudgetExhausted(RuntimeError):
+    """A configured spend budget is reached -- stop the run the same way as a usage limit."""
+
+
+class QuotaExhausted(RuntimeError):
+    """The plan/API usage limit is hit. Every further call would fail the same way -- stop the run."""
+
+
+_QUOTA = re.compile(r"(?i)hit your (?:session |usage |weekly )?limit|usage limit|quota|credit balance|resets? (?:at )?\d")
+
+
+class LLM:
+    """Two backends.
+
+    claude-cli (default): headless Claude Code on the user's own plan -- no API key to manage.
+      --no-session-persistence is load-bearing: without it every summary writes a new transcript
+      into ~/.claude/projects and the next sync would summarize its own summarizing.
+    openai: any OpenAI-compatible /chat/completions endpoint (LiteLLM, local models).
+    """
+
+    def __init__(self, cfg: dict, ledger: "Ledger | None" = None):
+        self.ledger = ledger or Ledger(cfg)
+        self.price_in = float(cfg["LLM_PRICE_IN_PER_M"]) / 1e6
+        self.price_out = float(cfg["LLM_PRICE_OUT_PER_M"]) / 1e6
+        self.label = threading.local()
+        self.backend = cfg["LLM_BACKEND"]
+        self.model = cfg["LLM_MODEL"]
+        self.resolved = cfg["LLM_MODEL"]
+        if self.backend == "claude-cli":
+            self.bin = shutil.which(os.path.expanduser(cfg["CLAUDE_BIN"]))
+            if not self.bin:
+                raise SystemExit(f"claude CLI not found ({cfg['CLAUDE_BIN']})")
+            self.workdir = pathlib.Path(os.path.expanduser(cfg["STATE_FILE"])).parent  # no project CLAUDE.md here
+            self.workdir.mkdir(parents=True, exist_ok=True)
+        elif self.backend == "openai":
+            if not cfg["LLM_BASE_URL"]:
+                raise SystemExit("LLM_BASE_URL is not set (see config.env.example)")
+            self.url = cfg["LLM_BASE_URL"].rstrip("/") + "/chat/completions"
+            self.key = secret(cfg, "LLM_API_KEY_FILE", "LLM_API_KEY_ENV")
+        else:
+            raise SystemExit(f"unknown LLM_BACKEND {self.backend!r}")
+
+    def estimate(self, system: str, user: str, max_tokens: int) -> float:
+        # ~3 chars/token over-estimates input (measured 3.1 on transcripts); assume the full output;
+        # +20% margin for anything unmeasured. Errs high on purpose: refusing early beats overshooting.
+        return 1.2 * ((len(system) + len(user)) / 3.0 * self.price_in + max_tokens * self.price_out)
+
+    def chat(self, system: str, user: str, max_tokens: int = 2500) -> str:
+        self.ledger.check(self.estimate(system, user, max_tokens))
+        return self._chat_cli(system, user) if self.backend == "claude-cli" else self._chat_openai(system, user, max_tokens)
+
+    def _chat_cli(self, system: str, user: str) -> str:
+        # Cost levers, measured on one session: $0.057 -> $0.015 with identical summary content.
+        #   alwaysThinkingEnabled=false  -- extended thinking was ~85% of output tokens
+        #   DISABLE_PROMPT_CACHING=1     -- Claude Code writes prompts to the 1h cache at 2x input
+        #                                   price; a one-shot call never reads it back
+        #   CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC=1 -- otherwise a hidden side request re-reads the
+        #                                   whole prompt (~20 tokens out, title-generation shaped),
+        #                                   doubling billed input: 9,638 vs 4,663 visible tokens.
+        cmd = [self.bin, "-p", "--model", self.model, "--no-session-persistence", "--tools", "",
+               "--strict-mcp-config", "--output-format", "json",
+               "--settings", json.dumps({"alwaysThinkingEnabled": False}), "--system-prompt", system]
+        env = dict(os.environ, DISABLE_PROMPT_CACHING="1", CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC="1")
+        last = ""
+        for attempt in range(5):
+            try:
+                proc = subprocess.run(cmd, input=user, capture_output=True, text=True, timeout=900, cwd=self.workdir, env=env)
+            except subprocess.TimeoutExpired:
+                last = "timeout"
+            else:
+                try:
+                    d = json.loads(proc.stdout)
+                except json.JSONDecodeError:
+                    d = {"is_error": True, "result": (proc.stdout or proc.stderr)[-300:]}
+                if d.get("usage") or d.get("total_cost_usd"):             # failed calls can still cost
+                    # modelUsage is what was BILLED across every request the CLI made; `usage` is only
+                    # the visible turn and undercounted by half before the nonessential-traffic fix.
+                    mu = list((d.get("modelUsage") or {}).values())
+                    billed = {"input_tokens": sum((v.get("inputTokens") or 0) + (v.get("cacheReadInputTokens") or 0)
+                                                  + (v.get("cacheCreationInputTokens") or 0) for v in mu),
+                              "output_tokens": sum(v.get("outputTokens") or 0 for v in mu)} if mu else (d.get("usage") or {})
+                    self.ledger.record(getattr(self.label, "v", "?"), self.model, billed, d.get("total_cost_usd"))
+                if not d.get("is_error") and d.get("result"):
+                    used = list((d.get("modelUsage") or {}).keys())
+                    if used:
+                        self.resolved = used[0]
+                    return d["result"]
+                last = str(d.get("result") or proc.stderr)[-300:]
+                if _QUOTA.search(last):
+                    raise QuotaExhausted(last.strip())
+                if not re.search(r"(?i)rate.?limit|overloaded|429|529|timeout|temporar", last):
+                    break                                              # not transient -- do not hammer
+            time.sleep(2 ** attempt * 10)
+        raise RuntimeError(f"claude -p failed: {last}")
+
+    def _chat_openai(self, system: str, user: str, max_tokens: int) -> str:
+        body = json.dumps({"model": self.model, "temperature": 0.2, "max_tokens": max_tokens,
+                           "messages": [{"role": "system", "content": system},
+                                        {"role": "user", "content": user}]}).encode()
+        for attempt in range(5):
+            req = urllib.request.Request(self.url, data=body, method="POST", headers={
+                "Authorization": f"Bearer {self.key}", "Content-Type": "application/json"})
+            try:
+                with urllib.request.urlopen(req, timeout=600) as r:
+                    d = json.load(r)
+                u = d.get("usage") or {}
+                self.ledger.record(getattr(self.label, "v", "?"), self.model,
+                                   {"input_tokens": u.get("prompt_tokens"), "output_tokens": u.get("completion_tokens")}, None)
+                return d["choices"][0]["message"]["content"]
+            except urllib.error.HTTPError as e:
+                detail = e.read()[:300].decode(errors="replace")
+                if _QUOTA.search(detail):
+                    raise QuotaExhausted(detail) from None
+                if e.code in (429, 500, 502, 503, 504, 529) and attempt < 4:
+                    time.sleep(2 ** attempt * 5)
+                    continue
+                raise RuntimeError(f"LLM HTTP {e.code}: {detail}") from None
+            except (urllib.error.URLError, TimeoutError) as e:
+                if attempt < 4:
+                    time.sleep(2 ** attempt * 5)
+                    continue
+                raise RuntimeError(f"LLM unreachable: {e}") from None
+        raise RuntimeError("LLM retries exhausted")
+
+    def summarize(self, meta: dict) -> dict:
+        text = redact(meta["transcript"])
+        if len(text) > CHUNK_CHARS:                       # map-reduce for long sessions
+            chunks, cur = [], []
+            size = 0
+            for part in text.split("\n\n"):
+                if size + len(part) > CHUNK_CHARS and cur:
+                    chunks.append("\n\n".join(cur)); cur, size = [], 0
+                cur.append(part); size += len(part) + 2
+            chunks.append("\n\n".join(cur))
+            notes = [self.chat(CHUNK_SYSTEM, f"Part {i + 1} of {len(chunks)}:\n\n{c}", 3000)
+                     for i, c in enumerate(chunks)]
+            text = "Condensed notes from each part of a long conversation, in order:\n\n" + \
+                   "\n\n---\n\n".join(notes)
+        header = f"Working directory: {meta.get('cwd')}\nGit branch: {meta.get('branch')}\n" \
+                 f"Existing title: {meta.get('title')}\n\n"
+        raw = self.chat(SYSTEM, header + text)
+        m = re.search(r"\{.*\}", raw, re.S)
+        if not m:
+            raise RuntimeError(f"LLM did not return JSON: {raw[:200]!r}")
+        out = json.loads(m.group(0))
+        for k in ("outcomes", "decisions", "facts", "open_threads", "tags"):
+            out[k] = [redact(str(x)) for x in (out.get(k) or []) if str(x).strip()]
+        out["summary"] = redact(str(out.get("summary", "")))
+        out["title"] = redact(str(out.get("title") or meta.get("title") or meta["session_id"]))
+        return out
+
+
+# --------------------------------------------------------------------------- vault
+class Vault:
+    def __init__(self, cfg: dict):
+        # OBSIDIAN_API_URL may list several URLs, comma-separated, tried in order at ping() -- e.g. the
+        # permanent address first and a port-forward second, so one config works either way.
+        self.candidates = [u.strip().rstrip("/") for u in cfg["OBSIDIAN_API_URL"].split(",") if u.strip()]
+        self.base = self.candidates[0]
+        self.key = secret(cfg, "OBSIDIAN_API_KEY_FILE")
+
+    def put(self, path: str, content: str) -> None:
+        req = urllib.request.Request(f"{self.base}/vault/{urllib.parse.quote(path)}",
+                                     data=content.encode(), method="PUT", headers={
+                                         "Authorization": f"Bearer {self.key}",
+                                         "Content-Type": "text/markdown"})
+        with urllib.request.urlopen(req, timeout=60) as r:
+            if r.status not in (200, 201, 204):
+                raise RuntimeError(f"vault PUT {path}: HTTP {r.status}")
+
+    def ping(self) -> None:
+        """Checked BEFORE any summarizing, so an unreachable vault never spends usage limits."""
+        errors = []
+        for base in self.candidates:
+            req = urllib.request.Request(f"{base}/", headers={"Authorization": f"Bearer {self.key}"})
+            try:
+                with urllib.request.urlopen(req, timeout=10) as r:
+                    info = json.load(r)
+                self.base = base
+                break
+            except (urllib.error.URLError, TimeoutError, OSError, ValueError) as e:
+                errors.append(f"{base}: {getattr(e, 'reason', e)}")
+        else:
+            raise SystemExit("Obsidian REST API unreachable -- " + "; ".join(errors))
+        print(f"vault: {self.base}", flush=True)
+        if not info.get("authenticated"):
+            raise SystemExit("Obsidian REST API reachable but the API key was rejected")
+
+
+_BAD = re.compile(r'[\\/:*?"<>|#^\[\]]+')
+
+
+def note_path(cfg: dict, kind: str, meta: dict, title: str) -> str:
+    when = (meta.get("first") or dt.datetime.now(dt.timezone.utc).isoformat())[:10]
+    slug = " ".join(_BAD.sub(" ", title).split())[:60].strip() or "untitled"
+    return f"{cfg['VAULT_FOLDER']}/{kind}/{when[:4]}/{when} {slug} ({meta['session_id'][:8]}).md"
+
+
+def render(meta: dict, s: dict, source: str, model: str, src_file: str | None) -> str:
+    project = pathlib.Path(meta["cwd"]).name if meta.get("cwd") else None
+    tags = ["claude", source] + [t for t in s["tags"] if t not in ("claude", source)]
+    fm = {
+        "type": "claude-conversation", "source": source, "session_id": meta["session_id"],
+        "title": s["title"], "project": project, "cwd": meta.get("cwd"), "branch": meta.get("branch"),
+        "started": meta.get("first"), "ended": meta.get("last"), "prompts": meta.get("prompts"),
+        "summarized_by": model, "synced": dt.datetime.now(dt.timezone.utc).strftime("%Y-%m-%dT%H:%M:%SZ"),
+        "tags": tags,
+    }
+    lines = ["---"] + [f"{k}: {json.dumps(v)}" for k, v in fm.items() if v not in (None, "")] + ["---", "",
+             f"# {s['title']}", "", "> [!summary]"] + [f"> {l}" for l in s["summary"].splitlines() or [""]]
+    for heading, key in (("Outcomes", "outcomes"), ("Decisions", "decisions"),
+                         ("Facts & gotchas", "facts"), ("Open threads", "open_threads")):
+        if s[key]:
+            lines += ["", f"## {heading}", ""] + [f"- {x}" for x in s[key]]
+    lines += ["", "---"]
+    if source == "claude-code":
+        lines.append(f"Resume: `claude --resume {meta['session_id']}`" + (f" · transcript `{src_file}`" if src_file else ""))
+    else:
+        lines.append(f"claude.ai conversation `{meta['session_id']}`")
+    return "\n".join(lines) + "\n"
+
+
+# --------------------------------------------------------------------------- state
+class State:
+    def __init__(self, path: str):
+        self.path = pathlib.Path(os.path.expanduser(path))
+        self.lock = threading.Lock()
+        self.data = json.loads(self.path.read_text()) if self.path.exists() else {}
+
+    def save(self) -> None:
+        self.path.parent.mkdir(parents=True, exist_ok=True)
+        tmp = self.path.with_suffix(".tmp")
+        tmp.write_text(json.dumps(self.data, indent=1, sort_keys=True))
+        tmp.replace(self.path)
+
+    def record(self, key: str, value: dict) -> None:
+        with self.lock:
+            self.data[key] = value
+            self.save()
+
+
+def write_index(cfg: dict, vault: Vault, state: State) -> None:
+    rows = sorted((v for v in state.data.values() if v.get("note")), key=lambda v: v.get("started") or "", reverse=True)
+    out = ["---", 'type: "claude-index"', "---", "", "# Claude conversations", "",
+           f"{len(rows)} conversations. Regenerated by claude-obsidian-sync.", "",
+           "| Date | Title | Project | Source |", "|---|---|---|---|"]
+    for v in rows:
+        link = v["note"][:-3]
+        title = v.get("title", "").replace("|", "-")
+        out.append(f"| {(v.get('started') or '')[:10]} | [[{link}\\|{title}]] | {v.get('project') or ''} | {v.get('source')} |")
+    vault.put(f"{cfg['VAULT_FOLDER']}/Index.md", "\n".join(out) + "\n")
+
+
+# --------------------------------------------------------------------------- commands
+def top_level_sessions(cfg: dict) -> list[pathlib.Path]:
+    root = pathlib.Path(os.path.expanduser(cfg["CLAUDE_PROJECTS_DIR"]))
+    return sorted(root.glob("*/*.jsonl"), key=lambda p: p.stat().st_mtime)   # nested = subagents
+
+
+def process(cfg, llm, vault, state, key, meta, source, kind, fingerprint, src_file, dry_run) -> str:
+    # Cache the summary until the note is written, so a vault failure never pays for it twice.
+    cache = pathlib.Path(os.path.expanduser(cfg["STATE_FILE"])).parent / "cache" / \
+        f"{hashlib.sha1(key.encode()).hexdigest()[:16]}-{hashlib.sha1(fingerprint.encode()).hexdigest()[:8]}.json"
+    llm.label.v = key
+    if cache.exists():
+        s = json.loads(cache.read_text())
+    else:
+        s = llm.summarize(meta)
+        cache.parent.mkdir(parents=True, exist_ok=True)
+        cache.write_text(json.dumps(s))
+    prev = state.data.get(key, {})
+    path = prev.get("note") or note_path(cfg, kind, meta, s["title"])        # stable across re-syncs
+    body = render(meta, s, source, llm.resolved, src_file)
+    if dry_run == "prefetch":
+        return f"summary cached ({path})"
+    if dry_run:
+        print(f"\n===== {path} =====\n{body}")
+        return path
+    vault.put(path, body)
+    cache.unlink(missing_ok=True)
+    state.record(key, {"note": path, "title": s["title"], "fingerprint": fingerprint, "source": source,
+                       "started": meta.get("first"),
+                       "project": pathlib.Path(meta["cwd"]).name if meta.get("cwd") else None})
+    return path
+
+
+SKIPPED = "(empty, skipped)"
+EX_TEMPFAIL = 75                    # "try again later" -- systemd logs it, the next timer run retries
+
+
+def run_jobs(cfg, work, fn) -> tuple[int, int, str | None, int]:
+    ok = failed = skipped = 0
+    quota = None
+    stop = threading.Event()        # Future.cancel() cannot stop a job a worker already picked up
+
+    def guarded(*w):
+        if stop.is_set():
+            raise cf.CancelledError()
+        try:
+            return fn(*w)
+        except (QuotaExhausted, BudgetExhausted):
+            stop.set()
+            raise
+
+    with cf.ThreadPoolExecutor(max_workers=int(cfg["JOBS"])) as ex:
+        futs = {ex.submit(guarded, *w): w for w in work}
+        for fut in cf.as_completed(futs):
+            label = futs[fut][0]
+            try:
+                result = fut.result()
+                if result == SKIPPED:
+                    print(f"skip {label} (no conversation content)", flush=True); skipped += 1
+                else:
+                    print(f"ok   {label} -> {result}", flush=True); ok += 1
+            except (QuotaExhausted, BudgetExhausted) as e:
+                if quota is None:
+                    quota = str(e)
+                    for f in futs:                                   # don't launch the rest
+                        f.cancel()
+            except cf.CancelledError:
+                pass
+            except Exception as e:                                   # keep going; next run retries
+                print(f"FAIL {label}: {e}", file=sys.stderr, flush=True); failed += 1
+    return ok, failed, quota, skipped
+
+
+def finish(ok: int, failed: int, quota: str | None, dry_run, remaining: int, ledger: "Ledger | None" = None) -> None:
+    verb = {"prefetch": "summarized into cache (vault untouched)"}.get(dry_run) or \
+        ("rendered (dry run, nothing written)" if dry_run else "written")
+    print(f"done: {ok} {verb}, {failed} failed, {remaining} still queued")
+    if ledger:
+        print(ledger.report())
+    if quota:
+        print(f"stopped: {quota}", file=sys.stderr)
+        sys.exit(EX_TEMPFAIL)
+    sys.exit(1 if failed else 0)
+
+
+def cmd_usage(cfg, args) -> None:
+    led = Ledger(cfg)
+    rows = led.entries()
+    if not rows:
+        print("no model calls recorded yet"); return
+    for label, hours in (("last 5h", 5), ("last 24h", 24), ("last 7d", 168)):
+        since = dt.datetime.now(dt.timezone.utc) - dt.timedelta(hours=hours)
+        es = [e for e in rows if dt.datetime.fromisoformat(e["ts"]) >= since]
+        print(f"{label:>9}: {len(es):4d} calls  {sum(e['input'] for e in es):>10,} in  "
+              f"{sum(e['output'] for e in es):>8,} out  ${sum(e.get('cost_usd') or 0 for e in es):.3f}")
+    print(f"budgets: ${led.run_budget:.2f}/run, ${led.day_budget:.2f}/24h (list-price equiv; plan meter: /usage in Claude Code)")
+
+
+def cmd_stats(cfg, args) -> None:
+    total = 0
+    rows = []
+    for p in top_level_sessions(cfg):
+        m = parse_claude_code(p)
+        n = len(redact(m["transcript"]))
+        total += n
+        rows.append((n, p.stat().st_size, m["prompts"], m["title"] or p.stem))
+    rows.sort(reverse=True)
+    for n, raw, msgs, title in rows[: args.top]:
+        print(f"{raw / 1e6:7.2f} MB raw -> {n / 1e3:7.1f} KB condensed  {msgs:4d} prompts  {title[:60]}")
+    print(f"\n{len(rows)} sessions, {total / 1e6:.1f} MB condensed (~{total / 4 / 1e6:.2f}M tokens in), "
+          f"{sum(1 for r in rows if r[0] > CHUNK_CHARS)} need map-reduce")
+
+
+def run_lock(cfg: dict):
+    """One run at a time: a timer run overlapping a manual one would race on state and ledger files."""
+    path = pathlib.Path(os.path.expanduser(cfg["STATE_FILE"])).parent / "run.lock"
+    path.parent.mkdir(parents=True, exist_ok=True)
+    fh = path.open("w")
+    try:
+        fcntl.flock(fh, fcntl.LOCK_EX | fcntl.LOCK_NB)
+    except BlockingIOError:
+        print("another claude-obsidian-sync run is in progress -- exiting")
+        sys.exit(0)
+    return fh                                                         # held until the process exits
+
+
+def cmd_sync(cfg, args) -> None:
+    _lock = run_lock(cfg)
+    state = State(cfg["STATE_FILE"])
+    settle = dt.timedelta(minutes=int(cfg["SETTLE_MINUTES"]))
+    now = time.time()
+    work = []
+    for p in top_level_sessions(cfg):
+        if args.session and p.stem != args.session:
+            continue
+        st = p.stat()
+        fp = f"{st.st_size}:{int(st.st_mtime)}"
+        key = f"claude-code:{p.stem}"
+        if not args.force and state.data.get(key, {}).get("fingerprint") == fp:
+            continue
+        if not (args.force or args.session) and now - st.st_mtime < settle.total_seconds():
+            continue                                                    # still being written
+        work.append((p, fp, key))
+    total = len(work)
+    cap = args.limit or int(cfg["MAX_PER_RUN"])
+    work = work[-cap:] if not args.oldest else work[:cap]            # newest first by default
+    print(f"{total} session(s) pending, summarizing {len(work)} this run", flush=True)
+    if not work:
+        return
+    prefetch = getattr(args, "prefetch", False)
+    llm, vault = LLM(cfg), (None if args.dry_run or prefetch else Vault(cfg))
+    if vault:
+        vault.ping()
+    mode = "prefetch" if prefetch else args.dry_run
+
+    def one(p, fp, key):
+        meta = parse_claude_code(p)
+        if not meta["transcript"].strip():
+            if not args.dry_run and not prefetch:
+                state.record(key, {"note": None, "fingerprint": fp, "source": "claude-code"})
+            return SKIPPED
+        src = str(p).replace(str(HOME), "~")
+        return process(cfg, llm, vault, state, key, meta, "claude-code", "Code", fp, src, mode)
+
+    ok, failed, quota, skipped = run_jobs(cfg, [(w[0].name, *w) for w in work], lambda _l, p, fp, key: one(p, fp, key))
+    if vault and ok:
+        write_index(cfg, vault, state)
+    finish(ok, failed, quota, mode, total - ok - skipped, llm.ledger)
+
+
+def cmd_import(cfg, args) -> None:
+    _lock = run_lock(cfg)
+    state = State(cfg["STATE_FILE"])
+    convs = parse_claude_ai_export(pathlib.Path(args.export))
+    work = []
+    for m in convs:
+        key = f"claude-ai:{m['session_id']}"
+        fp = m.get("last") or str(len(m["transcript"]))
+        if args.force or state.data.get(key, {}).get("fingerprint") != fp:
+            work.append((m, fp, key))
+    total = len(work)
+    work = work[: args.limit or int(cfg["MAX_PER_RUN"])]
+    print(f"{len(convs)} conversations in export, {total} new or changed, summarizing {len(work)} this run", flush=True)
+    if not work:
+        return
+    llm, vault = LLM(cfg), (None if args.dry_run else Vault(cfg))
+    if vault:
+        vault.ping()
+    ok, failed, quota, skipped = run_jobs(cfg, [((m.get("title") or m["session_id"])[:50], m, fp, key) for m, fp, key in work],
+                          lambda _l, m, fp, key: process(cfg, llm, vault, state, key, m, "claude-ai", "Web",
+                                                         fp, None, args.dry_run))
+    if vault and ok:
+        write_index(cfg, vault, state)
+    finish(ok, failed, quota, args.dry_run, total - ok - skipped, llm.ledger)
+
+
+def main() -> None:
+    ap = argparse.ArgumentParser(description=__doc__, formatter_class=argparse.RawDescriptionHelpFormatter)
+    sub = ap.add_subparsers(dest="cmd", required=True)
+    sub.add_parser("usage", help="model calls, tokens and spend from the local ledger")
+    s = sub.add_parser("stats", help="condensed sizes, no network")
+    s.add_argument("--top", type=int, default=15)
+    s = sub.add_parser("sync", help="summarize Claude Code sessions")
+    s.add_argument("--dry-run", action="store_true", help="print notes instead of writing them")
+    s.add_argument("--prefetch", action="store_true",
+                   help="summarize into the local cache without touching the vault; a later sync writes them at no extra cost")
+    s.add_argument("--force", action="store_true", help="ignore state and the settle window")
+    s.add_argument("--session", help="only this session id")
+    s.add_argument("--limit", type=int, help="max sessions this run (default MAX_PER_RUN)")
+    s.add_argument("--oldest", action="store_true", help="take the oldest pending sessions instead of the newest")
+    s = sub.add_parser("import-claude-ai", help="import a claude.ai data export")
+    s.add_argument("export", help="the export .zip or its conversations.json")
+    s.add_argument("--dry-run", action="store_true")
+    s.add_argument("--force", action="store_true")
+    s.add_argument("--limit", type=int, help="max conversations this run (default MAX_PER_RUN)")
+    args = ap.parse_args()
+    cfg = load_config()
+    {"stats": cmd_stats, "usage": cmd_usage, "sync": cmd_sync, "import-claude-ai": cmd_import}[args.cmd](cfg, args)
+
+
+if __name__ == "__main__":
+    main()

claude-obsidian/config.env.example

@@ -0,0 +1,28 @@
+# ~/.config/claude-obsidian/config.env  (chmod 600; never commit the real one)
+# Every key can also be set as an environment variable, which wins.
+
+# Obsidian Local REST API plugin -- the plain-HTTP server (Settings -> Local REST API ->
+# Enable HTTP server). Point this at wherever that port is reachable from this machine.
+# Several URLs, comma-separated, are tried in order -- e.g. a permanent address, then a port-forward.
+OBSIDIAN_API_URL=http://obsidian.example.internal:27123,http://127.0.0.1:27123
+OBSIDIAN_API_KEY_FILE=~/.config/claude-obsidian/api-key
+
+# Summarizer. claude-cli = headless `claude -p` on your own Claude plan (no API key needed).
+LLM_BACKEND=claude-cli
+LLM_MODEL=haiku       # sonnet writes noticeably sharper notes for ~1-3x the usage; set prices to match below
+# LLM_PRICE_IN_PER_M=1.0     # used only for the pre-call budget estimate (haiku list; sonnet 3.0 / 15.0)
+# LLM_PRICE_OUT_PER_M=5.0
+# CLAUDE_BIN=claude
+
+# Or any OpenAI-compatible endpoint (LiteLLM, a local model):
+# LLM_BACKEND=openai
+# LLM_BASE_URL=https://litellm.example/v1
+# LLM_MODEL=some-model
+# LLM_API_KEY_FILE=~/.config/claude-obsidian/llm-key     # or LLM_API_KEY_ENV=LITELLM_KEY
+
+VAULT_FOLDER=Claude
+SETTLE_MINUTES=30     # leave sessions alone until they have been idle this long
+JOBS=1
+MAX_PER_RUN=10        # summaries share your plan's usage limits; the timer drips a backlog
+BUDGET_USD_PER_RUN=0.50   # list-price USD, refused pre-flight; see `claude-obsidian-sync usage`
+BUDGET_USD_PER_DAY=2.00

claude-obsidian/install.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+# Install claude-obsidian-sync for the current user: binary into ~/.local/bin, systemd user
+# timer enabled. Idempotent. Does not create config or secrets -- see README.md.
+set -eu
+HERE="$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)"
+mkdir -p "$HOME/.local/bin" "$HOME/.config/systemd/user" "$HOME/.config/claude-obsidian"
+chmod 700 "$HOME/.config/claude-obsidian"
+ln -sf "$HERE/claude-obsidian-sync" "$HOME/.local/bin/claude-obsidian-sync"
+cp "$HERE/systemd/claude-obsidian-sync.service" "$HERE/systemd/claude-obsidian-sync.timer" "$HOME/.config/systemd/user/"
+[ -f "$HOME/.config/claude-obsidian/config.env" ] || { cp "$HERE/config.env.example" "$HOME/.config/claude-obsidian/config.env"; chmod 600 "$HOME/.config/claude-obsidian/config.env"; echo "created config.env from the example -- edit it"; }
+systemctl --user daemon-reload
+systemctl --user enable --now claude-obsidian-sync.timer
+echo "installed. check: systemctl --user list-timers claude-obsidian-sync.timer"
+echo "timers only run while logged in unless lingering is on: loginctl enable-linger \"\$USER\""

claude-obsidian/systemd/claude-obsidian-sync.service

@@ -0,0 +1,11 @@
+[Unit]
+Description=Summarize Claude conversations into Obsidian
+After=network-online.target
+
+[Service]
+Type=oneshot
+ExecStart=%h/.local/bin/claude-obsidian-sync sync
+Environment=PATH=%h/.local/bin:/usr/local/bin:/usr/bin:/bin
+# 75 = usage limit reached. The run stopped cleanly and the next timer run resumes -- not a failure.
+SuccessExitStatus=75
+Nice=10

claude-obsidian/systemd/claude-obsidian-sync.timer

@@ -0,0 +1,10 @@
+[Unit]
+Description=Hourly Claude -> Obsidian conversation sync
+
+[Timer]
+OnCalendar=hourly
+RandomizedDelaySec=10m
+Persistent=true
+
+[Install]
+WantedBy=timers.target