build-action
Skill from SynthFlowAI/AnthropicPlugin
Install
npx skills add SynthFlowAI/AnthropicPlugin --skill build-action
Runs the open skills CLI and installs the skill for your agent (Claude Code, Codex, Cursor …). Alternatively copy the skill folder into .claude/skills/ or upload it in Claude.ai under Settings → Skills.
As a Claude Code plugin
/plugin marketplace add anthropics/claude-plugins-official
/plugin install synthflow@synthflow
This skill is part of the plugin “synthflow”. In Claude Code the plugin installs it together with the plugin’s other skills, commands and hooks.
What does the build-action skill do?
Description from the SKILL.md in the source repository.
Questions about build-action
What does the build-action skill do?
Create, update, test, and attach Synthflow agent actions over MCP — custom HTTP actions, information extractors, transfers, SMS, real-time booking (Cal.com, GoHighLevel), IVR navigation, custom evaluations, and call-summary emails. Use this whenever the user wants to give an agent a new capability, connect it to an API or CRM, extract data from calls, add a transfer or SMS, set up booking, change an action's URL, body, or variables, or fix an action that isn't firing or is failing. Trigger on phrases like "add an action", "call my API during the call", "extract the caller's email", "set up a transfer", "connect booking", "update the webhook URL", or "the action isn't working".
How do I install build-action?
In a terminal: npx skills add SynthFlowAI/AnthropicPlugin --skill build-action. The skills CLI asks which agents to install it for. In Claude.ai you can upload the skill folder as a ZIP under Settings → Skills.
Which agents can use build-action?
Skills use the open SKILL.md format, which Claude Code, Claude.ai, the Claude API, OpenAI Codex, Cursor, Gemini CLI and other agents support.
Is build-action safe to use?
Our automatic check found no risky patterns (piped shell scripts, hidden characters, secret access, prompt overrides). It is not a full audit – read the SKILL.md and any scripts before installing.
More skills from SynthFlowAI/AnthropicPlugin
Build a call-volume and outcome report for a Synthflow agent, workspace, or agency — counts, durations, statuses, end-call reasons, call reasons from information extractors, transfer and booking results, and trends over a …
Review the last 100 calls for an agent and surface problems. Use this whenever the user wants a call-quality audit, a QA pass over recent calls, a "what's going wrong with this …
Investigate why a specific Synthflow call (or a small set of similar calls) went wrong — failed or missed transfers, calls cut off, the agent going silent or repeating itself, actions or …
Review AI voice-agent prompts, especially Synthflow Single-Prompt, for contradictions, missing context, unsafe tool/action behavior, escalation gaps, compliance risk, and regression risk.
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Make a change to a live Synthflow voice agent safely — record a baseline, save a draft, review the diff, publish only on approval, verify the published state, and roll back if …
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