Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add NicolaiSchmid/agent-skills --skill signal-history-searchgit clone --depth 1 https://github.com/NicolaiSchmid/agent-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/nicolaischmid/agent-skills/signal-history-search)<a href="https://agentmods.dev/skills/nicolaischmid/agent-skills/signal-history-search"><img src="https://agentmods.dev/badge/skills/nicolaischmid/agent-skills/signal-history-search/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/nicolaischmid/agent-skills/signal-history-search"><img src="https://agentmods.dev/badge/skills/nicolaischmid/agent-skills/signal-history-search.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00028 | $0.01111 |
| Opus 5.5 | $0.00011 | $0.00444 |
| Sonnet 5.5 | $0.00006 | $0.00222 |
| Haiku 4.5 | $0.00003 | $0.00111 |
Grade A, and why
signal-history-search scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 134 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Signal History Search
Direct SQL search against Signal Desktop's encrypted database. Queries complete in under 1 second against live data.
When to use
- You need to quote or summarize prior Signal conversations.
- You already have Signal Desktop installed on macOS.
- You want fast, instant search without export delays.
How it works
- Retrieves the encryption key from macOS Keychain (
Signal Safe Storage) - Decrypts the key using PBKDF2 (same as Signal Desktop)
- Opens the SQLite database directly with SQLCipher
- Runs SQL queries against
messagesandconversationstables - No files are written; searches happen in memory
First run caches the Python environment path (~5-10s setup), subsequent runs are sub-second.
Usage
# List all available chats
signal-search list
# Dump all messages from a specific day
signal-search dump --date "2026-01-25"
# Dump a specific day's chat with one person
signal-search dump --date "2026-01-25" --chat "Dariush"
# Search within a specific chat
signal-search search --query "istanbul" --chat "Monika"
# Search with context (messages before/after matches)
signal-search search --query "flight" --chat "Monika" --context 3
# Regex search across all chats
signal-search search --query "invoice.*\d{4}"
# Literal string search (not regex)
signal-search search --query "100$" --literal
# Case-sensitive search
signal-search search --query "API" --case-sensitive
# Limit number of results
signal-search search --query "meeting" --max-count 10
Commands
| Command | Description |
|---|---|
list |
List all available chats (name and type) |
dump |
Dump all messages from a specific day |
search |
Search messages |
Dump Flags
| Flag | Short | Description |
|---|---|---|
--date <YYYY-MM-DD> |
-d |
Date to dump (required) |
--chat <name> |
-c |
Filter to chats containing this string |
Search Flags
| Flag | Short | Description |
|---|---|---|
--query <pattern> |
-q |
Search pattern (regex by default) |
--chat <name> |
-c |
Filter to chats containing this string |
--context <n> |
-C |
Show N messages before and after matches |
--max-count <n> |
-m |
Stop after N matches |
--case-sensitive |
-s |
Case-sensitive search (default: smart-case) |
--literal |
-F |
Treat query as literal string, not regex |
What ships with it
4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2mo ago First seen · 134 lines · 28 tokens per session scan A 983902364d6b
signal-history-search is a skill published in the GitHub repository NicolaiSchmid/agent-skills (2 stars, last pushed 9mo ago), licensed MIT. It adds 28 tokens to every session and 1,111 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
signal-history-search compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| signal-history-searchNicolaiSchmid/agent-skills | Skill | 2 | 9mo ago | MIT | A | 28 | Claude Code, Codex |
| orbit-notionnexu-io/open-design | Skill | 106k | yesterday | Apache-2.0 | A | 117 | Claude Code, Codex |
| agentmailpaperclipai/paperclip | Skill | 111k | yesterday | MIT | A | 30 | Claude Code, Codex |
| Cortexdanielmiessler/LifeOS | Skill | 20k | yesterday | MIT | A | 184 | Claude Code |
| rowboat-spacesrowboatlabs/rowboat | Skill | 18k | yesterday | Apache-2.0 | A | 60 | Claude Code, Codex |
| feishuHmbown/CodeWhale | Skill | 41k | 5d ago | MIT | A | 33 | Claude Code, Codex |
| pinchtab-mcppinchtab/pinchtab | Skill | 11k | 10d ago | MIT | A | 52 | Claude Code, Codex |