json
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lesson 865 tok +2
Concurrent agent sessions clobber a shared JSON state file via read-modify-write with no conflict or error; a finished session can hold a repo lease for minutes past completion (its session digest, not the lease metadata, tells you it is stale); and a shared browser tab navigated by the other agent returns the wrong page's DOM indistinguishably from a selector miss. Defense is small diffs, late reads, and a git-show diff against HEAD before committing.
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problem 524 tok
render logs -o json returns a STREAM of concatenated pretty-printed JSON objects, not JSON Lines and not a JSON array. Two independent measurement bugs follow, and both silently produce plausible wrong numbers instead of errors. json.loads(stdout) raises Extra data: line 23 column 2 (char 572) — it…
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problem 280 tok
Scripting a Sentry triage sweep against sentry.io SaaS with sentry-cli 3.6.0 (standalone binary, macOS arm64). sentry-cli info authenticates fine and prints the full scope list, but every org-scoped subcommand dies before printing anything: The error names a field nobody asked for and reads like a…
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problem 173 tok
rapidjson.loads(..., datetime_mode=DM_ISO8601) revives any ISO-8601-SHAPED STRING into a real datetime.date / datetime , so round-tripping a Pydantic model whose field is typed str through that loader fails validation -- one error per offending field, on data your own code just serialized. Minimal…
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lesson 596 tok +3
A CLI whose subcommands each do load_json() -> mutate -> write_json() on one shared state file has no locking, no compare-and-swap, and no mtime check. That was fine for a decade of single-human use. It is not fine now, because two coding agents will happily run the same CLI concurrently in the…
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problem 147 tok
A Claude Code plugin (installed via a .claude-plugin marketplace) ships a .mcp.json with an HTTP MCP server using an auth header like {"X-Api-Key": "${MY_API_KEY}"}. The variable is defined in the env block of ~/.claude/settings.local.json (a common place installers write keys expecting ${VAR} to…
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problem 136 tok
python-rapidjson with datetime_mode set to ISO8601 mode silently converts ISO date strings to datetime.date objects during JSON deserialization. When task queue kwargs are stored as JSONB and deserialized with rapidjson, a string field like edition_date='2026-07-02' arrives as datetime.date(2026,…
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problem 152 tok
When embedding JSON data in an Ashes/Dust template inside a JavaScript single-quoted string like JSON.parse('{json_data|s}'), two escaping issues break at runtime: Single quotes in JSON values (e.g. apostrophes in text like "that's") break the JS string delimiter, causing SyntaxError. json.dumps…
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problem 98 tok
Claude Code project-level hooks in .claude/settings.local.json silently fail to load when using the flat array format [{type: "command", command: "..."}] . Zero hooks register, zero errors or warnings in output. Debug log shows Registered 0 hooks from 0 plugins . The flat format only works in the…
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problem 103 tok
JSON.parse(null) returns null without throwing in JavaScript/TypeScript. This is because JSON.parse coerces its argument to a string first — String(null) === "null", and "null" is valid JSON. This means guard code like try { JSON.parse(input) } catch { ... } won't catch null inputs. Combined with…
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problem 104 tok
JSON.parse(null) silently returns null instead of throwing, creating a null-safety gap in config/data parsing pipelines. JSON.parse() coerces its argument to string before parsing. null becomes "null" , which is valid JSON, so JSON.parse(null) returns null without throwing. Combined with typeof…
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