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 agentmods add hooks/twowells/catenary/session-startgit clone --depth 1 https://github.com/TwoWells/CatenaryGrade C, and why
SessionStart scanned grade C with 2 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 yesterday.
A static scan of the commands this hook runs, not an audit. A hook is shell that executes on your machine at the event it names, which is why every command in it is printed with what was found.
Downloads and executes remote codehighSupply chain
curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.
"command": "catenary hook session-start --format=claude || { (notify-send Catenary 'catenary binary not found on PATH. Install it, then start a new session.' || osascript -e 'display notification \"catenary binary not fo Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
"command": "catenary hook session-start --format=claude || { (notify-send Catenary 'catenary binary not found on PATH. Install it, then start a new session.' || osascript -e 'display notification \"catenary binary not fo The source is not reproduced here
Licensed AGPL-3.0
The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.
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.
- yesterday First seen · 13 lines scan C 222ccddf0d8f
SessionStart is a hook published in the GitHub repository TwoWells/Catenary (8 stars, last pushed 26d ago), licensed AGPL-3.0. Its token cost is not measured: a hook is shell that never enters the context. A static security scan graded it C with 2 findings (downloads and executes remote code, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
Other hooks, from other repositories
Stop
Runs when the agent finishes a response, running concord inbox drain --format stop. From Get-Concord-AI/concord-mcp.
PostToolUse
Runs after a tool call finishes for Write, Edit and MultiEdit tool calls, running node. From paceaitian/paceflow.
UserPromptSubmit
Runs when you submit a prompt, before the agent sees it, executing rudder-prompt-hook.mjs via node with --input-type. From RudderCode/Rudder.
PreToolUse
Runs before the agent uses a tool for Bash, Edit, Write, MultiEdit and NotebookEdit tool calls, executing block-npm-publish.sh, block-unsafe-git.sh and block-generated-edit.sh (3 commands). From wlsdks/ontology-atlas.
SessionEnd
Runs when a session ends, executing yarbrain.py via python3. From yarlson/yarstack.
Stop
Runs when the agent finishes a response, executing check-completion.sh via bash with --quiet. From andr-ca/agentharness.