Microsoft 365 Agents SDK is a C# and .NET software development kit for building agents that interact with users across Microsoft 365, Teams, Copilot Studio, Webchat, and selected third-party services. Developers use it to handle conversations, coordinate requests, generate responses, and enable collaboration between agents. The catalogue entries provide coding-agent instructions and agents for working with this SDK.
Borrowing it
Nothing to install: this file belongs to microsoft/Agents-for-net. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/microsoft/Agents-for-net/main/.github/prompts/fix-mermaid-syntax.prompt.mdgit clone --depth 1 https://github.com/microsoft/Agents-for-netWrote 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/commands/microsoft/agents-for-net/fix-mermaid-syntax)<a href="https://agentmods.dev/commands/microsoft/agents-for-net/fix-mermaid-syntax"><img src="https://agentmods.dev/badge/commands/microsoft/agents-for-net/fix-mermaid-syntax/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/commands/microsoft/agents-for-net/fix-mermaid-syntax"><img src="https://agentmods.dev/badge/commands/microsoft/agents-for-net/fix-mermaid-syntax.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 | $0.00000 | $0.00388 |
| Opus 5.5 | $0.00000 | $0.00155 |
| Sonnet 5.5 | $0.00000 | $0.00078 |
| Haiku 4.5 | $0.00000 | $0.00039 |
Grade A, and why
fix-mermaid-syntax 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 1mo 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.
What it actually says
Fix invalid Mermaid syntax in sequence diagrams
An automated lint pass (mmdc from @mermaid-js/mermaid-cli) found invalid Mermaid in
one or more docs/*sequence-diagram.md files — most likely introduced by the preceding
diagram-audit edit. The exact parser errors are appended to the end of this prompt under a
line === MERMAID LINT ERRORS === (each error includes the file path and the line/column
where parsing failed).
Your task
Fix only the Mermaid syntax so that every mermaid block parses and renders cleanly.
Rules
- You may only edit
docs/*sequence-diagram.mdfiles. Never modify source code, tests, build files, or anything undersrc/. - Make the smallest change that makes the Mermaid valid. Do not restructure diagrams, rename participants, or change the meaning/flow they describe. The goal is to repair syntax, not to re-audit the diagrams.
- Preserve the existing prose, tables, participant aliasing, style, and each file's encoding (these files may use a UTF-8 BOM — keep it).
- Use the lint errors below to locate each problem, then correct the offending Mermaid
statements. Common causes: a malformed message/arrow line, an unbalanced
alt/opt/loop/par/critical/endblock, a mismatchedactivate/deactivate, or an illegal character in a message or note. - Do not introduce new participants or steps that are not already present in the diagram.
Verify
Re-read every block you changed and confirm it is valid Mermaid sequenceDiagram syntax
before finishing. Do not print a summary — just make the edits.
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.
- 1mo ago First seen · 32 lines · 0 tokens per session scan A 7eadfcd9e4fc
fix-mermaid-syntax is a command published in the GitHub repository microsoft/Agents-for-net (183 stars, last pushed today), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 388 tokens. 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 2026-09-10.
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