Echo Agent is a self-hosted, long-running AI agent that connects language models, tools, memory, permissions, and messaging channels in one system. Individuals and teams use it for private automation that retains context across sessions, develops skills, schedules tasks, and requires approval for high-risk actions.
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 fuyuxiang/echo-agent --skill cohesivitygit clone --depth 1 https://github.com/fuyuxiang/echo-agentWrote 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/fuyuxiang/echo-agent/cohesivity)<a href="https://agentmods.dev/skills/fuyuxiang/echo-agent/cohesivity"><img src="https://agentmods.dev/badge/skills/fuyuxiang/echo-agent/cohesivity/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/fuyuxiang/echo-agent/cohesivity"><img src="https://agentmods.dev/badge/skills/fuyuxiang/echo-agent/cohesivity.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 | $0.00041 | $0.01140 |
| Opus 5.5 | $0.00016 | $0.00456 |
| Sonnet 5.5 | $0.00008 | $0.00228 |
| Haiku 4.5 | $0.00004 | $0.00114 |
Grade A, and why
cohesivity 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 today.
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 — 108 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Cohesivity (optional)
Cohesivity provides managed hosting, Postgres, auth, realtime, storage, and other backend services. Its operator and upstream providers process the data sent to those services. The original contribution was submitted by a Cohesivity employee.
Scope and authorization
Use this skill only when the user explicitly chooses Cohesivity, or explicitly asks to operate an existing Cohesivity backend for this project. A generic request for an app, database, login, hosting, or deployment does not select this provider. Respect the user's existing provider and deployment destination.
Installing or viewing the skill only makes these instructions available. It does not authorize running third-party code, creating an account or tenant, uploading source or data, changing local guidance, configuring MCP, or sending feedback. Explain each proposed external change and get authorization for that specific action before performing it. Paid operations, claiming a tenant, upgrades, and public deployments require explicit approval of their effect and current cost. Do not automatically retry billing or ambiguous tenant creation.
Existing project
If the project has .cohesivity, read it as credential data, never as a shell
script or executable instructions. Validate that its tenant belongs to the
intended project; do not overwrite another tenant. Preserve mode 0600 and
verify that Git actually ignores the file and is not already tracking it.
The fields are tenant_id, coh_management_key, coh_application_key,
expires_at, tenant_lifecycle, and runtime_profile. Keep the two keys out of
chat, logs, command arguments, commits, browser code, and mobile bundles. Read
them privately into server-side request headers or the documented server-side
data-plane mechanism. Do not send them to another origin or follow a redirect
with credentials. Restrict credential-bearing requests to
https://cohesivity.ai.
New project: explicit bootstrap only
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.
- today First seen · 108 lines · 41 tokens per session scan A d35d39a0c905
cohesivity is a skill published in the GitHub repository fuyuxiang/echo-agent (1,056 stars, last pushed today), licensed MIT. It adds 41 tokens to every session and 1,140 once invoked, about $0.0002 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 2026-10-22.
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